Biological evolution provides a creative fount of complex and subtle adaptations, often surprising the scientists who discover them. However, because evolution is an algorithmic process that transcends the substrate in which it occurs, evolution’s creativity is not limited to nature. Indeed, many researchers in the field of digital evolution have observed their evolving algorithms and organisms subverting their intentions, exposing unrecognized bugs in their code, producing unexpected adaptations, or exhibiting outcomes uncannily convergent with ones in nature. Such stories routinely reveal (...) creativity by evolution in these digital worlds, but they rarely fit into the standard scientific narrative. Instead they are often treated as mere obstacles to be overcome, rather than results that warrant study in their own right. The stories themselves are traded among researchers through oral tradition, but that mode of information transmission is inefficient and prone to error and outright loss. Moreover, the fact that these stories tend to be shared only among practitioners means that many natural scientists do not realize how interesting and lifelike digital organisms are and how natural their evolution can be. To our knowledge, no collection of such anecdotes has been published before. This paper is the crowd-sourced product of researchers in the fields of artificial life and evolutionary computation who have provided first-hand accounts of such cases. It thus serves as a written, fact-checked collection of scientifically important and even entertaining stories. In doing so we also present here substantial evidence that the existence and importance of evolutionary surprises extends beyond the natural world, and may indeed be a universal property of all complex evolving systems. (shrink)

Introduction to Philosophy, Fourth Edition, is the most comprehensive topically organized collection of classical and contemporary philosophy available. Building on the exceptionally successful tradition of previous editions, this edition for the first time incorporates the insights of a new coeditor, John Martin Fischer, and has been updated and revised to make it more accessible. Ideal for introductory philosophy courses, the text includes sections on the meaning of life, God and evil, knowledge and reality, the philosophy of science, the mind/body (...) problem, freedom of will, consciousness, ethics, and philosophical puzzles and paradoxes. It presents seventy substantial--and in some cases complete--selections from the best and most influential works in philosophy, offering a unique balance between classical and contemporary material. An extensive glossary of philosophical terms is also included. The fourth edition features fifteen new readings, including work by Albert Camus, Roderick M. Chisholm, Daniel Dennett, Harry G. Frankfurt, William Paley, Derek Parfit, John Perry, Richard Taylor, Peter Van Inwagen, Bernard Williams, and Susan Wolf. Part III, Knowledge and Reality, has been restructured and now includes Plato's Thaetetus, selections by Edmund L. Gettier and Robert Nozick, and an essay by Christopher Grau that explores the philosophical concepts presented in the popular film The Matrix. Two new ethics puzzles--"The Trolley Problem" and "Ducking Harm and Sacrificing Others"--are also included. This edition incorporates Study Questions after each reading and is accompanied by an Instructor's CD and a Student Companion Website, both containing helpful resources. (shrink)

Peter van Inwagen's Direct Argument (DA) purports to establish the incompatibility of determinism and moral responsibility, without appealing to the notion of avoidability, a notion on whose analysis compatibilists and incompatibilists disagree. Van Inwagen intended DA to refute compatibilism, or at least to shift the burden of proof onto the compatibilist. In this paper, we offer a critical assessment of DA. We examine a variety of objections to DA due to John Fischer and Mark Ravizza, Ishtiyaque Haji, Seth (...) Shabo, Michael McKenna, and David Widerker. We divide these objections into those based on dialectical considerations (section 1), and objections in the form of counterexamples to a central principle which the Direct Argument employs (sec 2). The conclusion we reach is that the proponent of DA can deal plausibly with these objections, thus establishing DA as a powerful argument in favor of incompatibilism. (shrink)

Peter van Inwagen's Direct Argument (DA) purports to establish the incompatibility of determinism and moral responsibility, without appealing to the notion of avoidability, a notion on whose analysis compatibilists and incompatibilists disagree. Van Inwagen intended DA to refute compatibilism, or at least to shift the burden of proof onto the compatibilist. In this paper, we offer a critical assessment of DA. We examine a variety of objections to DA due to John Fischer and Mark Ravizza, Ishtiyaque Haji, Seth (...) Shabo, Michael McKenna, and David Widerker. We divide these objections into those based on dialectical considerations (section 1), and objections in the form of counterexamples to a central principle which the Direct Argument employs (sec 2). The conclusion we reach is that the proponent of DA can deal plausibly with these objections, thus establishing DA as a powerful argument in favor of incompatibilism. (shrink)

The Intellectual Powers is a philosophical investigation into the cognitive and cogitative powers of mankind. It develops a connective analysis of our powers of consciousness, intentionality, mastery of language, knowledge, belief, certainty, sensation, perception, memory, thought, and imagination, by one of Britain’s leading philosophers. It is an essential guide and handbook for philosophers, psychologists, and cognitive neuroscientists. The culmination of 45 years of reflection on the philosophy of mind, epistemology, and the nature of the human person No other book in (...) epistemology or philosophy of psychology provides such extensive overviews of consciousness, self–consciousness, intentionality, mastery of a language, knowledge, belief, memory, sensation and perception, thought and imagination Illustrated with tables, tree–diagrams, and charts to provide overviews of the conceptual relationships disclosed by analysis Written by one of Britain’s best philosophical minds A sequel to Hacker’s Human Nature: The Categorial Framework An essential guide and handbook for all who are working in philosophy of mind, epistemology, psychology, cognitive science, and cognitive neuroscience. (shrink)

Introduction By the late fifth century BCE Panini had composed the Astadhyayi, consisting of nearly 4000 rules giving a precise and fairly complete ...

Introduction Max Horkheimer was born on February in Stuttgart. By the time he died, on 7 July in Nuremberg, he had played a decisive role in launching and ...

In clinical ethics, there remains a great deal of uncertainty regarding the appropriateness of attempting cardiopulmonary resuscitation (CPR) for certain patients. Although the issue continues to receive ample attention and various frameworks have been proposed for navigating such cases, most discussions draw heavily on the notion of harm as a central consideration. In the following, I use emerging philosophical literature on the notion of harm to argue that the ambiguities and disagreement about harm create important and oft-overlooked challenges for the (...) ethics of CPR. I begin by elucidating the standard account of harm, called the Counterfactual Comparative Account (CCA). I then show that three challenges to the CCA—preemptive harms, the harm of death, and non-experiential harms—are particularly salient when assessing potential harms for candidates of CPR and likely impact-related decision-making and communication. I extend this argument to explore how the ambiguities of harm might extend to other realms of clinical decision-making, such as the use and limitations of life-sustaining treatments. To address these challenges, I propose two strategies for identifying and minimizing the impact of such uncertainty: first, clinicians and ethicists ought to promote pluralistic conversations that account for different understandings of harm; second, they ought to invoke harm-independent considerations when discussing the ethics of CPR in order to reflect the nuances of such conversations. These strategies, coupled with a richer philosophical understanding of harm, promise to help clinicians and ethicists navigate the prevalent and difficult cases involving patient resuscitation and many other harm-based decisions in the clinical setting. (shrink)

This paper is a review of work on Newman's objection to epistemic structural realism (ESR). In Section 2, a brief statement of ESR is provided. In Section 3, Newman's objection and its recent variants are outlined. In Section 4, two responses that argue that the objection can be evaded by abandoning the Ramsey-sentence approach to ESR are considered. In Section 5, three responses that have been put forward specifically to rescue the Ramsey-sentence approach to ESR from the modern versions of (...) the objection are discussed. Finally, in Section 6, three responses are considered that are neutral with respect to one's approach to ESR and all argue (in different ways) that the objection can be evaded by introducing the notion that some relations/structures are privileged over others. It is concluded that none of these suggestions is an adequate response to Newman's objection, which therefore remains a serious problem for ESRists. Introduction Epistemic Structural Realism 2.1 Ramsey-sentences and ESR 2.2 WESR and SESR The Objection 3.1 Newman's version 3.2 Demopoulos and Friedman's and Ketland's versions Replies that Abandon the Ramsey-Sentence Approach to ESR 4.1 Redhead's reply 4.2 French and Ladyman's reply Replies Designed to Rescue the Ramsey-Sentence Approach 5.1 Zahar's reply 5.2 Cruse's reply 5.3 Melia and Saatsi's reply Replies that Argue that Some Structures/Relations are Privileged 6.1 A Carnapian reply 6.2 Votsis' reply 6.3 The Merrill/Lewis/Psillos reply Summary CiteULike Connotea Del.icio.us What's this? (shrink)

There are at least three things we might mean by "ethics in robotics": the ethical systems built into robots, the ethics of people who design and use robots, and the ethics of how people treat robots. This paper argues that the best approach to robot ethics is one which addresses all three of these, and to do this it ought to consider robots as socio-technical systems. By so doing, it is possible to think of a continuum of agency that lies (...) between amoral and fully autonomous moral agents. Thus, robots might move gradually along this continuum as they acquire greater capabilities and ethical sophistication. It also argues that many of the issues regarding the distribution of responsibility in complex socio-technical systems might best be addressed by looking to legal theory, rather than moral theory. This is because our overarching interest in robot ethics ought to be the practical one of preventing robots from doing harm, as well as preventing humans from unjustly avoiding responsibility for their actions. (shrink)

For most of the history of metaphysics, the subject has been dominated by the concept of substance. There is an everyday commonsense notion of substance which is perfectly harmless and which I shall defend against attempts to remove it or revise it away. But I deny that substance has to be construed as a primitive even in everyday terms. Borrowing Strawson’s distinction between descriptive and revisionary metaphysics, I press the legitimate claims of revisionary metaphysics and argue that there is no (...) place for a fundamental concept of substance within it, although aspects of the concept are likely to find their place therein. (shrink)

Wittgenstein presents in the Tractatus a variable purporting to capture the general form of proposition. One understanding of what Wittgenstein is doing there, an understanding in line with the ‘new’ reading of his work championed by Diamond, Conant and others, sees it as a deflationary or even an implosive move—a move by which a concept sometimes put by philosophers to distinctively metaphysical use is replaced, in a perspicuous notation, by an innocent device of generalization, thereby dispersing the clouds of philosophy (...) that formerly surrounded the concept. By asking how Wittgenstein supposed his variable to work, and what work he imagined it was fit for, the paper questions the adequacy of that understanding. (shrink)

A vital step to successfully orienting Deleuze with biosemiotics (and theories of biological complexity overall) is to discover a coherent scientific throughline in his work that also accounts for the aesthetic/creative dimension of his philosophy. This requires the heterodox move (from a Deleuzean point of view) of giving priority to the organism. I argue that Deleuze’s treatment of the organism does more than signal a superficial relation to biological complexity theory that, as a result of his nuanced take on the (...) matter, undermines the value of the organic body to his system. Instead, we can recognize a working theory of autopoiesis in the early Deleuze that scaffolds as well as substantiates his later ethological and biosemiotic observations and reveals a definite, albeit minimal, notion of subjectivity in his work. Most importantly, reorienting his logic of sense as a logic of _sense-making_, or the context-dependent signification between system and environment (Thompson, 2007 ), allows us to begin the work of mining a scientific throughline in Deleuze’s work akin to biological complexity theory that is of value to both Deleuze studies and biosemiotics. (shrink)

How can anyone be rational in a world where knowledge is limited, time is pressing, and deep thought is often an unattainable luxury? Traditional models of unbounded rationality and optimization in cognitive science, economics, and animal behavior have tended to view decision-makers as possessing supernatural powers of reason, limitless knowledge, and endless time. But understanding decisions in the real world requires a more psychologically plausible notion of bounded rationality. In Simple heuristics that make us smart (Gigerenzer et al. 1999), we (...) explore fast and frugal heuristics – simple rules in the mind's adaptive toolbox for making decisions with realistic mental resources. These heuristics can enable both living organisms and artificial systems to make smart choices quickly and with a minimum of information by exploiting the way that information is structured in particular environments. In this précis, we show how simple building blocks that control information search, stop search, and make decisions can be put together to form classes of heuristics, including: ignorance-based and one-reason decision making for choice, elimination models for categorization, and satisficing heuristics for sequential search. These simple heuristics perform comparably to more complex algorithms, particularly when generalizing to new data – that is, simplicity leads to robustness. We present evidence regarding when people use simple heuristics and describe the challenges to be addressed by this research program. Key Words: adaptive toolbox; bounded rationality; decision making; elimination models; environment structure; heuristics; ignorance-based reasoning; limited information search; robustness; satisficing; simplicity. (shrink)

ABSTRACT:The link between firm corporate social performance (CSP) and executive compensation could be driven by a sorting effect (a firm’s CSP is related to the initial levels of compensation of newly hired executives), or by an incentive effect (incumbent executives are rewarded for past firm CSP). Existing empirical work focuses exclusively on the incentive effect. In contrast, in this paper we explore the sorting effect of firm CSP on the initial compensation of newly hired executives. In doing so, we develop (...) a novel theoretical approach based on an integration of stakeholder theory and human capital theory, suggesting a positive association between the initial compensation of executives and firm CSP strengths and concerns. It also suggests that the strength of this relationship varies between different executive roles (as a function of stakeholder-management responsibilities). We find support for this theoretical framework in a large sample of newly-hired executives employed by Standard & Poor 1500 firms. (shrink)

This paper explains the absence of the problem of other minds in ancient philosophy and links its rise in early modern philosophy with the distinction between primary and secondary qualities and the consequent veil of ideas. The futile struggles of early modern philosophers with the problems is delineated. So too are the incoherent theories of modern neuroscientists and psychologists. The sources of the manifold confusions are pinned down to use and misuse of the concept of mind, to misunderstandings about the (...) nature of the human ability to say how things are subjectively with oneself, to misconstruals of the nature of introspection and self-knowledge, and to the misguided picture of the “inner” and the “outer”. Philosophical misunderstandings about knowledge of other minds has masked the genuine limitations on our knowledge and understanding of our fellow human beings. Some of these rest on ignorance, others on the constitutional indeterminacy of the mental. (shrink)

RAID-II is a high-bandwidth, network-attached storage server designed and implemented at the University of California at Berkeley. In this paper, we measure the performance of RAID-II and evaluate various architectural decisions made during the design process. We first measure the end-to-end performance of the system to be approximately 20 MB/s for both disk array reads and writes. We then perform a bottleneck analysis by examining the performance of each individual subsystem and conclude that the disk subsystem limits performance. By adding (...) a custom interconnect board with a high-speed memory and bus system and parity engine, we are able to achieve a performance speedup of 8 to 15 over a comparative system using only off-the-shelf hardware. (shrink)

The most prevalent modes of philosophy, educational theory, and philosophy of education currently extant in the United States represent a pronounced departure from the fundamental patterns of the Greek-Jewish- Christian tradition. Among the noteworthy characteristics of the more popular trends is a tendency toward the denial of, or an indifference regarding, the existence of a Transcendent Being. This feature alone has effected a radical departure from the scholarly traditions which are characterized by investigations into the relationships between theology and philosophy. (...) This factor, in turn, bears potentially strong influence upon the theory and practice of education. Partially in order to promote the revivification of a heritage not unrelated to that of many early American intellectual leaders, the main purpose of this paper is to exemplify the structure and an aspect of the substance of a theology-philosophy of Catholic education in accord with a selected passage from A New Catechism: Catholic Faith for Adults. The theological-philosophical dimension of this structure is represented by a developmental process entailing three stages of progression: from human love through an awareness of the “God of the philosophers” to belief in Christ. It is shown how theological and philosophical elements of this process bear upon the importance of early childhood religious education as well as of Catholic education somewhat more broadly conceived. It is noted that, although the theological-philosophical foundations allow for numerous options in education, there are bounds within which the direction of this education must be retained. The current importance of this kind of investigation lies in 1) the fundamentally empiricist approaches in philosophy of education so prominent today, 2) the inability of empiricist philosophies to confront prescriptive values in an authentically rational fashion, and 3) the necessity of a theological-philosophical approach for the Christian who wishes to think rationally about prescriptive values, and to formulate the kinds of educational plans which will prove to be effective in promoting authentic human happiness. Brief references to the practical efficacy of theoretical conceptions, and to teacher education, conclude the paper. (shrink)

Pāṇinīyavyākaraṇodāharaṇakośaḥ; La grammaire paninéenne par ses exemples; Paninian Grammar through Its Examples, vol. I: Udāharaṇasamāhāraḥ; L’ensemble des exemples; The Collection of Examples; saṁśodhitaprakāśanam, édition révisée, revised edition. Two parts. By F. Grimal, V. Venkataraja Sarma, S. Lakshminarasimham, K. V. Ramakrishnamacharyulu, and Jagadeesh Bhat. Rashtriya Sanskrit Vidyapeetha Series, vols. 309, 310; Collection indologie 93.1.1, 2. Tirupati: Rashtriya Sanskrit Vidyapeetha; Pondichéry: École française d’Extrème-Orient; Institut Français de Pondichéry, 2018. Pp. xiii + 757 + 481. Rs. 680, 450.

Philosophic inquiry into the mental states of elite athletes during skilled motor performance continues to grow. In contrast to the bulk of these works that focus almost exclusively on skillful performance, this paper examines athletic motor behavior from a point of inexactness – or even failure – in athletic performance. Utilizing the works of Michael Polanyi, who believed that both ideas of achievement and failure were equally necessary to understand the behavior of living things and their physical actions, I examine (...) the notion of failure as a framework to scrutinize the cognitive processes occurring during the development and performance of skilled motor behavior. After reviewing Polanyi’s conceptions of personal knowing to locate the source of inaccuracy in human activity, I present Polanyi’s distinction between two kinds of mistakes and apply each to inaccurate sport performance. I then suggest that mistakes in sport should be re-conceptualized beyond their current negative connotations. Instead, conceptions of mistakes should also include respect for ‘man’s most distinguished act’ – that being the production of knowledge. From this expanded perspective, the value of inexact motor performance can be found in addition to notions of uncertainty and skill development in what Polanyi calls ‘metaphysical implication of a groping for reality’. In some final thoughts, I will suggest future implications of the value of the inexact on broader sport issues. (shrink)

Viṣamapadavyākhyā: A Commentary on Bhaṭṭoji Dīkṣita’s Śabdakaustubha Attributed to Nāgeśabhaṭṭa. Edited by James W. Benson. American Oriental Series, vol. 97. New Haven: American Oriental Society, 2015. Pp. xl + 233.

The relationship of part to whole is one of the most fundamental there is; this is the first and only full-length study of this concept. This book shows that mereology, the formal theory of part and whole, is essential to ontology. Peter Simons surveys and criticizes previous theories, especially the standard extensional view, and proposes a more adequate account which encompasses both temporal and modal considerations in detail. 'Parts could easily be the standard book on mereology for the next (...) twenty or thirty years.' Timothy Williamson, Grazer Philosophische Studien. (shrink)

Accounts of creation in Sanskrit literature include a number of hymns in the R̥gveda principal among which are R̥V 10.72, 10.81–82, 10.90, 10.121, and 10.129. Later accounts appear in the Mānavadhārmaśāstra, the Mahābhārata, and purāṇas. Scholars generally describe these accounts as various, mutually inconsistent myths, or as superseded stages of philosophical thought. Even recent treatments of Indian cosmogony that praise the poetic subtlety and prowess of their composers consider their work as products of individual poetic imagination. Yet, despite the variety (...) of expression in the various accounts, they appear to convey a consistent model of the origin of the world. Moreover, the model of the absolute and the first stages of creation mirror the descriptions of the development of enlightenment in foundational texts of Vedānta and systematic analyses of Yoga. The descriptions of creation may therefore rather be the result of the special insight of enlightened sages than the results of individual imagination. (shrink)

In his doctoral dissertation Von der mannigfachen Bedeutung des Seienden nach Aristoteles Brentano tried to show that (against criticism of this) one could indeed give a principle defense of Aristotle's table of categories as a coherent system. In later texts Brentano appears sharply critical of Aristotle, mainly in respect to Aristotle's mereology, or theory of part and whole, and to his theory of substance and accident. It is argued that Brentano hadn't observed that Aristotle's belief that there are as many (...) predicative senses of 'be' as there are categories of being is based not on his mereology but on his theory of definition. Overlooking this Brentano was led to far reaching inadequate ontological consequences. (shrink)

Within the context of sports, the term 'miracle' is regularly associated with game-winning shots, holes-in-one, completed Hail Marys and other improbable outcomes. These conceptions of miracles largely focus on the success of specific sport actions at specific times when such success is deemed highly improbable. While prominent in the popular sports literature, most scholars agree that this perspective on miracles is very simple and highly unsophisticated. Events portrayed as simply 'beating the odds' would represent pale versions of miracles at best. (...) Some conceptions of miracles, however, include characteristics that reach beyond improbable outcomes. From more sophisticated perspectives, miracles are often viewed as divine action guiding the ordinary course of human experience. To be considered 'miraculous', improbable outcomes in sport would need to be perceived as interactions between the supernatural (God or other divine entity) and the natural (physical world). In addition, miraculous occurrences would have to be a part of a divine master-plan. Scholars argue that without such connections, miracles would yield no direction or meaning to the evolving world. The differences between these two perceptions raises several questions: Why do some view these extraordinary athletic performances from spiritually sophisticated perspectives while others have not the 'ears to hear' or the 'eyes to see' the divine possibilities in these experiences? Why are common uses and perceptions of miracles in sport simplistic and thin? What is a sophisticated view of miracles? What human abilities and processes are needed for one to achieve a sophisticated perspective? And, finally, what is the purpose of the true or sophisticated miracle in sport? In this paper, I will examine the notion of the miracle in sport. At its core, this paper describes how an athlete intellectually and spiritually moves from the unsophisticated to the sophisticated conception of a miracle. Through the writings of James, Lewis, Polanyi and others, I will show how human intellectual operations allow one to have 'ears to hear' and 'eyes to see' the spiritually miraculous in sport. I will begin by presenting an unsophisticated version of miracles in sport. After critically examining several types of miracles, I will present a more sophisticated definition. I will then explore the human processes necessary to view miraculous experiences in sport as interactions between the natural and the supernatural rather than interpreting these experiences simply as improbable outcomes. Finally, I will show how miracles present opportunities for spiritual conversion and have a use and place in the divine's master plan. (shrink)

But logic as it stands, e.g. in Principia Mathematica, can quite well be applied to our ordinary propositions; e.g. from ‘All men are mortal’ and ‘Socrates is a man’ there follows according to this logic ‘Socrates is mortal’, which is obviously correct, even though I equally obviously do not know what structure is possessed by the thing Socrates or the property of mortality. Here they just function as simple objects.

While theories of rationality and decision making typically adopt either a single-powertool perspective or a bag-of-tricks mentality, the research program of ecological rationality bridges these with a theoretically-driven account of when different heuristic decision mechanisms will work well. Here we described two ways to study how heuristics match their ecological setting: The bottom-up approach starts with psychologically plausible building blocks that are combined to create simple heuristics that fit specific environments. The top-down approach starts from the statistical problem facing the (...) organism and a set of principles, such as the bias– variance tradeoff, that can explain when and why heuristics work in uncertain environments, and then shows how effective heuristics can be built by biasing and simplifying more complex models. We conclude with challenges these approaches face in developing a psychologically realistic perspective on human rationality. (shrink)

A way of reading the Tractatus has been proposed which, according to its advocates, is importantly novel and essentially distinct from anything to be found in the work of such previously influential students of the book as Anscombe, Stenius, Hacker or Pears. The point of difference is differently described, but the currently most used description seems to be Goldfarb’s term ‘resolution’ – hence one speaks of ‘the resolute reading’. I’ll shortly ask what resolution is. For now, it is enough that (...) it aims to give full weight to the penultimate section of the Tractatus in which Wittgenstein declares his propositions to be nonsense, where giving full weight to that declaration involves not hearing it as allowing that those ‘nonsensical’ propositions might have another kind of ‘sense’. In that same section Wittgenstein explains that these nonsense propositions, while devoid of meaning, have a use: to make the kind of use of them that their author intends – and so to understand him – requires recognizing that they are nonsense; and through that recognition one ‘surmounts’ these propositions, and is led ‘to see the world aright’. So there is a point to all this nonsense. What point? (shrink)

Frege's theory of real numbers has undeservedly received almost no attention, in part because what we have is only a fragment. Yet his theory is interesting for the light it throws on logicism, and it is quite different from standard modern approaches. Frege polemicizes vigorously against his contemporaries, sketches the main features of his own radical alternative, and begins the formal development. This paper summarizes and expounds what he has to say, and goes on to reconstruct the most important steps (...) which he is likely to have subsequently taken. The various difficulties facing his theory in this reconstruction are outlined, and some surprising consequences drawn about the nature of his logicism. (shrink)

This chapter contains sections titled: Two‐Wheeled Sensations The “Bicycling Method” Lessons from the Saddle Finding the Words Notes.

Although Brentano generally regarded himself as at heart a metaphysician, his work then and subsequently has always been dominated by the Psychology. He is rightly celebrated as the person who reintroduced the Aristotelian-Scholastic notion of intentio back into the study of the mind. Brentano's inspiration was Aristotle's theory of perception in De anima, though his terminology of intentional inexistence was medieval. For the history of the work and its position in his output may I refer to my Introduction to the (...) reprinted English translation. Alongside Aristotle the work shows influences of Descartes, Comte and the British empiricists. The theory of intentionality presented in the Psychology is much less modern and less plausible than almost all recent commentary would have it, and was in any case not where Brentano's main interest lay. Intentionality simply served to demarcate mental phenomena from physical, in Book One, but the main aim was a classification of the mental, outlined in Book Two. Books Three to Five were to have dealt in detail with the three main classes of presentations, judgements and feelings, with the final book considering the metaphysics: mind-body and the immortality of the soul. Brentano's shifting views, recently documented in English with Benito Muller's translation of Descriptive Psychology, a work from the transitional 1890s, made the original plan obsolete. The role of an a priori, philosophical or descriptive psychology, methodologically prior to empirical-experimental genetic psychology, foreshadowed and influenced Husserl's notion of phenomenology, and Brentano's Comtean methodological epoche of desisting from controversial metaphysical statements in favour of an examination of the phenomena likewise presaged Husserl's more ponderous phenomenological reductions. Brentano's other work covers most areas of philosophy, notably ethics, where he upheld a form of a priori intuitionism much admired by G. E. Moore, the philosophy of religion, metaphysics, philosophy of language, deductive and inductive logic, and the history of philosophy. I shall mention just two areas. In his logic lectures from 1866 onwards (a compilation published 1956) Brentano rejected the subject-predicate analysis of simple judgements and proposed instead (for which he apparently secured written assent from Mill) that all judgements are logical compounds of positive and negative existential judgements. For example the universal judgement All men are mortal becomes the negative existential There are no immortal men. On this basis Brentano radically simplified the inference rules of deductive logic. While unlike de Morgan, Frege and others he does not go beyond logic's traditional scope by recognising relations, within its bounds his reformed-term logic is simple, elegant and easily teachable. Some of his ideas in logic influenced the young Husserl. Unfortunately Brentano took against mathematical logic, which he wrongly associated exclusively with Hamilton's confused doctrine of the quantification of the predicate. His inductive logic, which takes up by far the greater part of his logic lectures, remains unresearched to this day. (shrink)