The physiological blind spot corresponds to the optic disc where the retina contains no light-detecting photoreceptor cells. Our perception seemingly fills in this gap in input. Here we suggest that rather than an active process, such perceptual filling-in could instead be a consequence of the integration of visual inputs at higher stages of processing discounting the local absence of retinal input. Using functional brain imaging, we resolved the retinotopic representation of the physiological blind spot in early human (...) visual cortex and measured responses while participants perceived filling-in. Responses in early visual areas simply reflected the absence of visual input. In contrast, higher extrastriate regions responded more to stimuli in the eye containing the blind spot than the fellow eye. However, this signature was independent of filling-in. We argue that these findings agree with philosophical accounts that posit that the concept of filling-in of absent retinal input is unnecessary. (shrink)

The very idea of a retinal pattern-sensation that can be impressed on the neural tissue of the brain is a misconception, for the neural pattern never even existed in the retinal mosaic. There can be no anatomical engram in the brain if there was no anatomical image in the retina. The retina jerks about. It has a rapid tremor. It even has a gap in it (the blind spot). It is a scintillation, not an image. An engram (...) impressed on the brain would have to be divided into two changing parts in the two halves of the brain, which is impossible. The whole idea stems from the persistent myth that there has to be something in the brain that is visible, and from Johannes Mueller's assumption that the nerves telegraph messages to the brain. (shrink)

When confronted with an ethical dilemma, most of us like to think we would stand up for our principles. But we are not as ethical as we think we are. In Blind Spots, leading business ethicists Max Bazerman and Ann Tenbrunsel examine the ways we overestimate our ability to do what is right and how we act unethically without meaning to. From the collapse of Enron and corruption in the tobacco industry, to sales of the defective Ford Pinto, the downfall (...) of Bernard Madoff, and the Challenger space shuttle disaster, the authors investigate the nature of ethical failures in the business world and beyond, and illustrate how we can become more ethical, bridging the gap between who we are and who we want to be. Explaining why traditional approaches to ethics don't work, the book considers how blind spots like ethical fading--the removal of ethics from the decision--making process--have led to tragedies and scandals such as the Challenger space shuttle disaster, steroid use in Major League Baseball, the crash in the financial markets, and the energy crisis. The authors demonstrate how ethical standards shift, how we neglect to notice and act on the unethical behavior of others, and how compliance initiatives can actually promote unethical behavior. They argue that scandals will continue to emerge unless such approaches take into account the psychology of individuals faced with ethical dilemmas. Distinguishing our "should self" from our "want self", the authors point out ethical sinkholes that create questionable actions. Suggesting innovative individual and group tactics for improving human judgment, Blind Spots shows us how to secure a place for ethics in our workplaces, institutions, and daily lives. (shrink)

A judge springs out of his car on the way to court in downtown Chicago and takes photographs of an inflatable rat. A while later he inserts these photographs into a decision involving another inflatable rodent. Judges now regularly insert pictures in judgments, but there is no study either of the genres or the precedential status of these modern visual emblemata, these pictorial interventions in the record. Using a comparative visual corpus of over three hundred images extracted from diverse common (...) law jurisdictions, the practice of retinal justice, the novelty of vision in decision, is here anatomized, choreographed, and critically classified. (shrink)

Wright, Ken Review(s) of: Blind spots: Why We Fail to Do What's Right And What to Do about It, by Max H. Bazerman and Ann E. Tenbrunsel Princeton University Press 2011, x, 191pp.

How can the subliminal, mysterious, but uncommonly powerful living-on, the presence, of the past be envisaged? In this essay I argue that presence is not brought about by stories — by, that is, the "storiness" of stories. Presence rather shows itself in how the past can force us—and enable us—to rewrite our stories about ourselves. The question then is how we acquire the experiences that can eventually force us to do so. How, and with what kind of things, does the (...) mémoire involontaire—from which presence wells up—get filled? In order to answer this question one might turn it around to the question how we can fill the mémoire involontaire of others. A consideration of the "art of slandering" shows that the mémoire involontaire tends to get filled with things that we believe are "common knowledge," that are "obliquely" communicated, and that are cast in metonymies. Metonymy offers a much better road to the mémoire involontaire than metaphor because metonymy is better at suggesting that what it conveys is "common knowledge." Therefore, I propose that presence resides in the metonymical region of language. Instead of being contained in the meaningful content of stories, presence resides in what a story inadvertently has to be—in, that is, the things a story has to present in order to present a story. My conclusion is that as presence the past is the exact opposite of what historians think it is. It is indestructible, uncannily close, and—despite its closeness and its durability—utterly impossible to conserve in "representations" that can be taken along in the hand luggage with which we traverse time. (shrink)

The retinal pigment epithelium (RPE) is a specialized epithelium at the back of the eye that carries out a variety of functions essential for visual health. Recent studies have advanced our molecular understanding of one of the major functions of the RPE; phagocytosis of spent photoreceptor outer segments (POS). Notably, a mechanical link, formed between apical integrins bound to extracellular POS and the intracellular actomyosin cytoskeleton, is proposed to drive the internalization of POS. The process may involve a “nibbling” (...) action, as an initial step, to sever outer segment tips. These insights have led us to hypothesize an “integrin adhesome‐like” network, atypically assembled at apical membrane RPE‐POS contacts. I propose that this hypothetical network orchestrates the complex membrane remodeling events required for particle internalization. Therefore, its analysis and characterization will likely lead to a more comprehensive understanding of the molecular mechanisms that control POS phagocytosis. (shrink)

This paper aims to identify several interpretive problems posed by the final part ofDAII.11 (423b27–424 a10), where Aristotle intertwines the thesis that a sense is like a ‘mean’ and an explanation for the existence of a ‘blind spot’ related to the sense of touch, adding the further contention that we are capable of discriminating because the mean ‘becomes the other opposite’ in relation to the perceptible property being perceived. To solve those problems, the paper explores a novel interpretation of (...) Aristotle’s claims, arguing that they describe a homeostatic physiological reaction by which the sensory apparatus responds to perceptible stimuli. According to the proposed interpretation, such homeostatic reaction constitutes a necessary condition for perceiving what Aristotle refers to as ‘proper’ perceptible features, which include properties like ‘hot’ and ‘cold’ as well as colors and sounds. (shrink)

How does neuronal activity give rise to cognitive capacities? To address this question, neuroscientists hypothesize about what neurons “represent,” “encode,” or “compute,” and test these hypotheses empirically. This process is similar to the assessment of hypotheses in other fields of science and as such is subject to the same limitations and difficulties that have been discussed at length by philosophers of science. In this paper, we highlight an additional difficulty in the process of empirical assessment of hypotheses that is unique (...) to the cognitive sciences. We argue that, unlike in other scientific fields, comparing hypotheses according to the extent to which they explain or predict empirical data can lead to absurd results. Other considerations, which are perhaps more subjective, must be taken into account. We focus on one such consideration, which is the purposeful function of the neurons as part of a biological system. We believe that progress in neuroscience critically depends on properly addressing this difficulty. (shrink)

In lieu of an abstract, here is a brief excerpt of the content:Blind Spots and Avenues for Transformation within the Utopian Canon: Toward A Terrestrial EcotopianismHeather Alberro (bio)Limitations and Exclusions of the (Western) Utopian CanonUtopianism in all of its manifestations often powerfully (re)surfaces during times of significant socio-ecological upheaval as a response to oppressive and exploitative realities. As such it is a fervent refusal against a given status quo and its purported inevitability. Utopianism and hope are rendered possible by, and (...) draw their transformative potential from, the boundless terrain of potentiality surrounding any given reality.1 Indeed, without such conditions of radical uncertainty, hope and utopianism would not be possible. Often and understandably, the seminal works of Plato, Thomas More, William Morris, H. G. Wells and others come to mind when we think of utopian studies. Hence Kumar’s parochial observation that there is no discernible utopian tradition beyond the West because other cultures lack the foundational myth of the Golden Age—that is, the Garden of Eden, Atlantis, and Arcadia—that has been so formative to the development of utopia in the West.2 These traditional or “transcendental” utopian modalities often feature a dichotomous opposition to their present reality, depicting time and historical movement [End Page 528] as linear successions of stages proceeding from an archaic past and toward a future wherein the utopian ideal is seen as occupying a “fixed space outside time and history.”3 Such temporally “transcendent” utopias marked the dawn of the modern phase of utopian thought, originating in the seventeenth century alongside new theories of social evolution that coalesced into modern Enlightenment notions of linear historical progress.4Prioritizing Pluralism: Critical Heterotopias of the “Here and Now”What kind of life? We are still confronted with the demand to state the “concrete alternative.” The demand is meaningless if it asks for a blueprint of the specific institutions and relationships which would be those of the new society: they cannot be determined a priori; they will develop, in trial and error, as the new society develops.5Tom Moylan’s notion of “critical utopianism,” which emerged during the “historic block” of political opposition of the 1960s and 1970s, marks one important step within the utopian canon toward praxis and the essential “Nowness” of critique and imaginative projection.6 This “critical” strand of utopianism is fueled by a fervent opposition to the exploitation and domination of people and the natural world that is increasingly characteristic of Western-capitalist societies.7 This opposition is coupled with a utopian desire for mutual aid, ecological resilience, liberation, and peaceful living—in effect, a longing for community.8 The “critical” in Moylan’s formulation has a bivalency: first, in the sense of critique through the debunking and deconstruction of the utopian genre itself, which was “colonized” by capitalism toward the 1970s and infused with technocratic dreams of material abundance through boundless economic expansion; and second, in the sense of the critical mass required to effect fundamental societal transformations.9 If the better is the enemy of the good, then perfection serves as “a stick with which to beat the possible.”10 Utopias do not offer rigid blueprints of a fixed or perfect ideal world but rather head toward “the ideal” by offering “a rich blending of creative fantasy, critical thinking, and oppositional activism” predicated on a demand for radically new relations between social and natural systems.11 Ever critically self-reflective, critical utopias continually remind us of the limitations of the utopian impulse, particularly the dangers of pursuing rigid and transcendental visions of “the better.” Nevertheless, these are desperate times that demand some orientation toward a better; utopianism’s [End Page 529] denunciative function is not enough. Thus, in his impassioned recent work Becoming Utopian, Moylan denotes the need for an intersectional, democratically unified leadership structure that can help sustain a political movement for counteracting the “global/neoliberal superpower order while reaching for a utopian horizon.”12 With a focus more on process than a fixed ideal, the critical utopia explores and articulates vibrant post-capitalist futures that are simultaneously open-ended, and far more socio-ecologically resilient than the “now” of late capitalism.Akin in function and style to critical utopias are the grounded and transgressive... (shrink)

For any system that uses previous experience to solve problems in new situations, it is necessary to identify the features in the situation that should match features in the previous cases through some process ofsituation analysis. In this paper, we examine this problem in the legal domain, where lawyers know it asissue spotting. In particular, we present an implementation of issue spotting in CHASER, a legal reasoning system that works in the domain of tort law.This approach is a compromise between (...) generality and efficiency, and is applicable to a range of problems and domains besides legal reasoning. In particular, it presents a principled way to use multiple cases for a single problem by exploiting the inherent structure present in many domains. (shrink)

Dispositionalist accounts of belief define beliefs in terms of specific sets of dispositions. In this article, I provide a blind-spot argument against these accounts. The core idea of the argument is that beliefs having the form [p and it is not manifestly believed that p] cannot be manifestly believed. This means that one cannot manifest such beliefs in one’s assertions, conscious thoughts, actions, behaviours, or any other type of activity. However, if beliefs are sets of dispositions, they must be (...) manifestable in some way. Therefore, according to my argument, beliefs are not sets of dispositions. The argument is defended against some possible objections. (shrink)

Users of sociotechnical systems often have no way to independently verify whether the system output which they use to make decisions is correct; they are epistemically dependent on the system. We argue that this leads to problems when the system is wrong, namely to bad decisions and violations of the norm of practical reasoning. To prevent this from occurring we suggest the implementation of defeaters: information that a system is unreliable in a specific case (undercutting defeat) or independent information that (...) the output is wrong (rebutting defeat). Practically, we suggest to design defeaters based on the different ways in which a system might produce erroneous outputs, and analyse this suggestion with a case study of the risk classification algorithm used by the Dutch tax agency. (shrink)

Spotting is a typical isolated head coordination used by many dancers during rotation. However, with sporadic and inconclusive explanations as to why dancers spot, the critical characteristics and functionalities of spotting have yet to be identified. Therefore, a Delphi method survey was used as a novel methodology for providing greater insights into this under-examined motor behavior, bringing together experts from various disciplines to generate ideas and identify the crucial elements of spotting. Following the selection of experts, three rounds of (...) data collection and analysis were conducted to narrow down relevant topics and evaluate consensus. To gather opinions in Round 1, experts were asked to respond freely to three prompts regarding the reasoning, characteristics, and uses of successfully spotting; responses were then grouped into predominant items. To rate agreement in Round 2, experts rated their agreement on the relevance of the grouped items from Round 1 on a 5-point Likert scale; items rated 4 or 5 by at least 70% of the experts were taken as those consensually relevant to the group. To rank importance in Round 3, Best-Worst Scaling was used to determine individual rankings of the relevant items from Round 2. In a series of comparisons, experts were prompted to select the most and least important items in multiple sub-groupings. Group mean ranking of items as well as ranking concordance and differentiation were analyzed to determine the most important items and the strength of consensus, respectively. Overall, consensus and differentiation in experts’ item rankings were low; however, novel insights were presented. As characteristics of successfully spotting, experts emphasized head isolation, timing, and gaze specificity alongside functional characteristics, substantiating spotting as purposeful action in rotation. Building on traditional notions of spotting for reduced dizziness and maintaining balance, successfully spotting was further deemed useful for multiple turns, orientation, and rhythm. The findings of this study thus provide informed guidelines for future analysis and training of this complex head coordination in rotations. (shrink)

Bender, Robert Review of: Run, spot, run: The ethics of keeping pets, by Jessica Pierce, Uni of Chicago Press, 2016, 264 pages.

Classic theories of religious toleration from the 17th century regularly made exceptions for various categories of people such as Catholics and atheists who need not be tolerated. From a contemporary perspective these may be understood as blind spots because at least some of us would argue that these exceptions were not necessary. This essay explores the toleration theories of John Milton, Benedict de Spinoza, Denis Veiras, John Locke and Pierre Bayle in order to assess whether they actually called for such (...) exceptions and whether those exceptions were justifed or were in fact blind spots. It concludes with some reflections on what our own blind spots may be, and whether we can see around them. (shrink)

Sensorimotor theorists of perception have argued that eye movement is a necessary condition for seeing on the basis that subjects whose retinal images do not move undergo a form of blindness. I show that the argument does not work.

Metamorphosis in frogs is a critical developmental process through which a tadpole changes into an adult froglet. Metamorphic changes include external morphological transformations as well as important changes in the wiring of sensory organs and central nervous system. This review aims to provide an overview on the events that occur in the visual system of metamorphosing amphibians and to discuss recent studies that provide new insight into the molecular mechanisms that control changes in the retinal growth pattern as well (...) as the formation of new axonal pathways in the central nervous system. BioEssays 23:319–326, 2001. © 2001 John Wiley & Sons, Inc. (shrink)

According to an influential philosophical view I call “the relational properties view”, “perspectival” properties, such as the elliptical appearance of a tilted coin, are relational properties of external objects. Philosophers have assessed this view on the basis of phenomenological, epistemological or other purely philosophical considerations. My aim in this paper is to examine whether it is possible to evaluate RPV empirically. In the first, negative part of the paper I consider and reject a certain tempting way of doing so. In (...) the second, positive part of the paper I suggest a novel way of evaluating RPV empirically, relying on the influential object files framework. (shrink)

ObjectiveRetinal vein occlusion (RVO) is the second most common retinal vascular disorder after diabetic retinopathy, which is the main cause of vision loss. Retinal vein occlusion might lead to macular edema, causing severe vision loss. Previous neuroimaging studies of patients with RVO demonstrated that RVO was accompanied by cerebral changes, and was related to stroke. The purpose of the study is to investigate synchronous neural activity changes in patients with RVO.MethodsA total of 50 patients with RVO and 48 (...) healthy subjects with matched sex, age, and education were enrolled in the study. The ReHo method was applied to investigate synchronous neural activity changes in patients with RVO.ResultsCompared with HC, patients with RVO showed increased ReHo values in the bilateral cerebellum_4_5. On the contrary, patients with RVO had decreased ReHo values in the bilateral middle occipital gyrus, right cerebelum_crus1, and right inferior temporal gyrus.ConclusionOur study demonstrated that patients with RVO were associated with abnormal synchronous neural activities in the cerebellum, middle occipital gyrus, and inferior temporal gyrus. These findings shed new insight into neural mechanisms of vision loss in patients with RVO. (shrink)

The rotating spot method of timing subjective events involves the subject’s watching a rotating spot on a computer and reporting the position of the spot at the instant when the subjective event of interest occurs. We conducted an experiment to investigate factors that may impact on the results produced by this method, using the subject’s perception of when they made a simple finger movement as the subjective event to be timed. Seven aspects of the rotating spot (...) method were investigated, using a factorial experiment. Four of these aspects altered the physical characteristics of the computer generated spot or clock face and the remaining three altered the instructions given to the participant. We found compelling evidence that one factor, whether the subject was instructed to report the instant when the finger movement was initiated or the instant when it was completed, resulted in a systematic shift in the response. Evidence that three other factors affect the observed variability in the response was also found. In addition, we observed that there are substantial systematic differences in the responses made by different subjects. We discuss the implications of our findings and make recommendations about the optimal way of conducting future experiments using the rotating spot method. Our overall conclusion is that our results strongly validate the rotating spot method of timing at least the studied variety of subjective event. (shrink)

Developers of generative machine learning models have pledged to enable users to identify model-generated content -- that is, to "spot the bot". In this short note, I explain why this promise is based on a bait and switch.

This chapter analyses the Church's efforts in opposing The Da Vinci Code as a concerted bid to reinforce the ideological bulwark surrounding millennia-old structures of episcopal governance. It postulates that it was Church leaders sensing a challenge to Roman Catholicism's traditional manner of organizing and exercising power in the form of depersonalized office charisma that provoked the criticisms they mounted worldwide against The Da Vinci Code. Weber's discussion of models for the institutionalization of legitimate power speaks directly to the contingency (...) of outcomes for religions founded upon charismatic authority. In early 2005 Cardinal Tarcisio Bertone, a former high Vatican official, urged Catholics to shun the novel like rotten food and branded the bestseller 'a sack full of lies' insulting the Christian faith. For Weber, the Catholic Church provided a paradigmatic example of the rise of a bureaucracy to the position of an all-powerful authority. (shrink)

Diseases causing inherited retinal degeneration in humans, such as retinitis pigmentosa and macular dystrophy, are genetically heterogeneous and clinically diverse. More than 40 genes causing retinal degeneration have been mapped to specific chromosomal sites; of these, at least 10 have been cloned and characterized. Mutations in two proteins, rhodopsin and peripherin/RDS, account for approximately 35% of all cases of autosomal dominant retinitis pigmentosa and a lesser fraction of other retinal conditions. This target article reviews the genes and (...) mutations causing retinal degeneration and proposes mechanisms whereby specific mutations lead to particular clinical consequences, that is, the relationship between genotype and phenotype. Retinitis pigmentosa and macular dystrophy are genetically heterogeneous diseases that cause retinal degeneration in humans and often result in severe visual impairment or blindness. Although many of the genes causing these diseases have not been identified, three photoreceptor-specific proteins have been implicated: rhodopsin, peripherin/RDS, and the P-subunit of rod phosphodiesterase. Mutations in the genes for these three proteins can cause either dominant retinitis pigmentosa, recessive retinitis pigmentosa, dominant congenital stationary night blindness, or dominant macular degeneration. Why this multiplicity of clinical phenotypes? Our target article summarizes the genetic and biochemical background to this question and proposes a number of possible explanations. Discussion focuses mainly on 73 distinct disease-causing mutations of rhodopsin. We feel that rhodopsin and other photoreceptor proteins can serve as model systems for unraveling the connection between genotype and phenotype, not only for inherited retinal diseases but for other degenerative disorders as well. (shrink)

Groove—defined as the pleasurable urge to move to a rhythm—depends on a fine-tuned interplay between predictability arising from repetitive rhythmic patterns, and surprise arising from rhythmic deviations, for example in the form of syncopation. The perfect balance between predictability and surprise is commonly found in rhythmic patterns with a moderate level of rhythmic complexity and represents the sweet spot of the groove experience. In contrast, rhythms with low or high complexity are usually associated with a weaker experience of groove (...) because they are too boring to be engaging or too complex to be interpreted, respectively. Consequently, the relationship between rhythmic complexity and groove experience can be described by an inverted U-shaped function. We interpret this inverted U shape in light of the theory of predictive processing and provide perspectives on how rhythmic complexity and groove can help us to understand the underlying neural mechanisms linking temporal predictions, movement, and reward. A better understanding of these mechanisms can guide future approaches to improve treatments for patients with motor impairments, such as Parkinson’s disease, and to investigate prosocial aspects of interpersonal interactions that feature music, such as dancing. Finally, we present some open questions and ideas for future research. (shrink)

An important function of scientific diagrams is to identify causal relationships. This commonly relies on contrasts that highlight the effects of specific difference-makers. However, causal contrast diagrams are not an obvious and easy to recognize category because they appear in many guises. In this paper, four case studies are presented to examine how causal contrast diagrams appear in a wide range of scientific reports, from experimental to observational and even purely theoretical studies. It is shown that causal contrasts can be (...) expressed in starkly different formats, including photographs of complexly visualized macromolecules as well as line graphs, bar graphs, or plots of state spaces. Despite surface differences, however, there is a measure of conceptual unity among such diagrams. In empirical studies they generally serve not only to infer and communicate specific causal claims, but also as evidence for them. The key data of some studies is given nowhere except in the diagrams. Many diagrams show multiple causal contrasts in order to demonstrate both that an effect exists and that the effect is specific -- that is, to narrowly circumscribe the phenomenon to be explained. In a large range of scientific reports, causal contrast diagrams reflect the core epistemic claims of the researchers. (shrink)

Why absolute certainty is impossible in science In today's unpredictable and chaotic world, we look to science to provide certainty and answers—and often blame it when things go wrong. The Blind Spot reveals why our faith in scientific certainty is a dangerous illusion, and how only by embracing science's inherent ambiguities and paradoxes can we truly appreciate its beauty and harness its potential. Crackling with insights into our most perplexing contemporary dilemmas, from climate change to the global financial meltdown, (...) this book challenges our most sacredly held beliefs about science, technology, and progress. At the same time, it shows how the secret to better science can be found where we least expect it—in the uncertain, the ambiguous, and the inevitably unpredictable. William Byers explains why the subjective element in scientific inquiry is in fact what makes it so dynamic, and deftly balances the need for certainty and rigor in science with the equally important need for creativity, freedom, and downright wonder. Drawing on an array of fascinating examples—from Wall Street's overreliance on algorithms to provide certainty in uncertain markets, to undecidable problems in mathematics and computer science, to Georg Cantor's paradoxical but true assertion about infinity—Byers demonstrates how we can and must learn from the existence of blind spots in our scientific and mathematical understanding. The Blind Spot offers an entirely new way of thinking about science, one that highlights its strengths and limitations, its unrealized promise, and, above all, its unavoidable ambiguity. It also points to a more sophisticated approach to the most intractable problems of our time. (shrink)

From all directions comes confirmation that technology, information technology above all, is radically transforming today’s business. All observers predict that this technologizing of business will continue in the 21st century with major consequences. This article argues that business ethics cases (the most popular way of approaching business ethics) as well as the broader corporate cultural values (a less popular but equally important focus for business ethics) are inexorably affected by the technological revolution in business. But of 29 business ethics textbooks (...) published in the past 5 years, only 4 show any awareness of the new configuration of hard ethics cases, and only 2 of those 4 go beyond the case approach to examine the changes in corporate cultural values. If this technological blind spot in business ethics is not corrected, the business ethics guild will have radically failed its calling and responsibility. The consequences of technological blindness and naivete in business ethics are potentially dire because of the massive power of our technologies. (shrink)

Cognition or higher brain activity is sometimes seen as a phenomenon greater than the sum of its parts. This viewpoint however is largely dependent on the state of the art of experimental techniques that endeavor to characterize morphology and its association to function. Retinal ganglion cells are readily accessible for this work and we discuss recent advances in computational techniques in identifying novel parameters that describe structural attributes possibly associated with specific function. These parameters are based on calculating wavelet (...) gradients from cell images followed by the extraction of meaningful measures including 2nd wavelet moment, entropy of orientation, and curvature. For the three cell types analyzed, the mean 2nd wavelet moment, which relates to the field of influence of the dendritic-tree segments was significantly different. cells had the highest mean 2nd wavelet moment, followed by the and cells (134 ± 22, 93 ± 19 and 63 ± 12, respectively). There was no significant difference between cells for entropy of orientation, indicating no class with a preferential orientation of their dendritic tree. Curvature provided similar results to the 2nd wavelet moment with cells having the highest curvature followed by and the cells (mean ± SD: 161 ± 15; 134 ± 22; 121 ± 15). Our feature space analysis also indicated a difference between these cell types. No difference was found between the and cell types and their physiological counterparts the Y and X cells based on wavelet analysis. Both the X and Y cells can be divided into two subtypes, the ON- and OFF-center cells based on the stratification level of the dendritic tree within the retina. Using 2nd wavelet moment, a difference in their morphological attributes, not reported previously, was noted for these subtypes. The 2nd wavelet moment and curvature are further discussed with respect to explaining regularity of spacing and coverage associated with retinal ganglion cell mosaics. (shrink)