This commentary focuses on Hommel et al.'s inferences on action planning. It discusses the relevance of anticipated extrinsic movement effects for action control, the problems of a feature-based representation of actions, and the necessity of the acquisition of conditional movement-effect associations.

Maxwell et al. [Maxwell, J. P., Masters, R. S. W., Kerr, E., & Weedon, E. . The implicit benefit of learning without errors. The Quarterly Journal of Experimental Psychology, 54A, 1049–1068. The implicit benefit of learning without errors. The Quarterly Journal of Experimental Psychology, 54A, 1049–1068] suggested that, following unsuccessful movements, the learner forms hypotheses about the probable causes of the error and the required movement adjustments necessary for its elimination. Hypothesis testing is an explicit process that places demands on (...) cognitive resources. Demands on cognitive resources can be identified by measuring probe reaction times and movement times. Lengthened PRT and movement times reflects increased cognitive demands. Thus, PRT and movement times should be longer following errors, relative to successful, movements. This hypothesis was tested using a motor skill . Furthermore, the association between error processing and the preparation and execution phases of movement was examined. The data confirmed that cognitive demand is greater for trials following an error, relative to trials without an error. This effect was apparent throughout learning and in both the preparatory and execution phases of the movement. Cognitive effort also appeared to be higher during movement preparation, relative to movement execution. (shrink)

Although the following essay is literary-philosophical, it arose from a practical interest. I have been struck by how widespread today is the complaint about the ‘inadequate father’. Of course a father may be inadequate in diverse ways, either absconding, absent and weak, or overbearing, bullying, and tyrannical, or some combination of these. Further, I am not restricting the term ‘father’ to its narrow biological sense, but using it rather as a metaphor for any institution or structure which an individual or (...) a group feels should have been in place to guide, direct, and protect them in important situations, but did not do its job properly. Consequently they are willing to concede they are not all they could have been, but they insist it is not their fault, rather the fault of the ‘father’ who should have done his job better. This ties in with the fashionable appeal of ‘victimhood’. Everybody today seems to want to cast themselves as a ‘victim’, for reasons similar to those mentioned above. If you are a ‘victim’, then there must be an ‘oppressor’– and some ‘parent’ organization that should have guided, directed, and protected you against the oppressor, but again did not do its job adequately. It is striking how many individuals and groups around the world today choose to perceive themselves, and to present themselves to others, as ‘victims’; it has indeed become a preferred characterization of our age, for it carries with it a rhetorical advantage that trumps all others. If you are able to cast yourself as a ‘victim’, and have others accept this, you disarm and neutralize criticism, not only of what you are, but of what you are currently doing – because the latter can be presented as a just ‘compensation’ for what you have suffered. As with guilt, there is no built-in quota or statute of limitations. This rhetoric was not as common thirty or forty years ago.There is an added factor here in America and the New World generally where, according to a whispered criticism, as our ancestors crossed the ocean, they experienced a ‘drop in civilization’. Life here was initially without some of the structures and institutions which had evolved over thousands of years in the Old World, which could thus be presumed there but here were absent. As we won with difficulty our independence, we unconsciously repudiated much of the ‘higher culture’ of the colonial master, throwing out the baby with the bathwater. As the ‘economic bubble’ of having won the Second World War has gradually dissipated, we discover we are handicapped by an absence of the forms of maturation and self-realization that arise in and are necessary for dealing with prolonged peace. In our ‘ideology of liberty’, our adults become essentially grown children, unschooled in anything higher, and thus have particular difficulty assuming the responsibilities of parenthood. They are forced to fall back upon a military style of giving orders, because on this side of the water, ‘final causes’ in the form of commonly admired or agreed on goals for striving are not in place. In this sense there is an absence of the ‘adequate father’. Further, as ‘American Culture’ expands through publicity and the media, we spread the same disease.There is another relevant factor, the ‘celebrity-liberationist’ lifestyle that has been diffused into the general population since the 1960's and has become a default secular ethic of our time, replacing the traditional Judeo-Christian decalogue. The former is invoked as a justification for aggressively seeking fame and fortune, and making no attempt to conceal this; rather than worrying that such an attitude will cause offense, it is worn proudly and defiantly in the hope that others will identify with it, thereby branding the performer a cultural hero. This popular strategy towards fulfilment itself rests on a metaphysic of ‘expressive individualism’, a position that holds that the supreme ethical imperative to which other obligations must be subordinated is for each to bring forward their hidden noumenal core, the only source of value, into phenomenal appearances where it may be admired and benefit others and such that creation will for the first time be complete. This change in Western culture made possible by greater affluence and security represents a trickle-down phenomenon and democritization of the awe reserved for the artist revered as a genius during the nineteenth century, now spread to the entire population. Anything that constrains this expansion, which interrupts or limits this transfer, is to be rejected as parental abuse, psychological repression, or cultural imperialism. (shrink)

Zusammenfassung Der Einfluss von sozialer Ungleichheit auf Sportverhalten und motorische Leistung wird in der Literatur kontrovers diskutiert und dargestellt. Gerade die Effekte bei Kindern und Jugendlichen, deren Sozialstatus von den Eltern abgeleitet ist, werden in diesem Kontext nur unzureichend thematisiert. Anhand einer Stichprobe von Schülern im Saarland soll der Frage nachgegangen werden, inwieweit das Geschlecht sowie der von den Eltern abgeleitete Sozialstatus sowohl Sportverhalten als auch motorische Leistungen determinieren. Von 1286 Schülern wurden die Eltern zum Sozialstatus sowie zu Aspekten des (...) Sportverhaltens der Kinder gefragt. 887 dieser Schüler wurden mit dem DMT 6-18 motorisch getestet. Vor allem das Sportengagement in Sportvereinen sowie die Beteiligung an Wettkämpfen hängen deutlich vom Geschlecht ab, während allgemein das Sportengagement geschlechtsunspezifisch ist. Sowohl Sportengagement als auch motorische Leistungen werden vom Sozialstatus der Eltern determiniert. (shrink)

Glover's planning–control model is based on his finding that visual illusions exert a larger effect in early phases than in late phases of a movement. But evidence for this dynamic illusion effect is weak, because: (a) it appears difficult to replicate; (b) Glover overestimates the accuracy of his results; and (c) he seems to underestimate the illusion effect at late phases.

Plamondon & Alimi's derivation of the kinematic model is mathematically flawed. By simply naming a particular parameter combination the model fails to explicate the sources of variability. As a result, the model cannot distinguish between various sources of error, such as those resulting from task demands and those resulting from movement execution.

In cognitive science, creative ideas are defined as original and feasible solutions in response to problems. A common proposal is that creative ideas are generated across dedicated cognitive pathways. Only after creative ideas have emerged, they can be enacted to solve the problem. We present an alternative viewpoint, based upon the dynamic systems approach to perception and action, that creative solutions emerge in the act rather than before. Creative actions, thus, are as much a product of individual constraints as they (...) are of the task and environment constraints. Accordingly, we understand creative motor actions as functional movement patterns that are new to the individual and/or group and adapted to satisfy the constraints on the motor problem at hand. We argue that creative motor actions are promoted by practice interventions that promote exploration by manipulating constraints. Exploration enhances variability of functional movement patterns in terms of either coordination or control solutions. At both levels, creative motor actions can emerge from finding new and degenerate adaptive motor solutions. Generally speaking, we anticipate that in most cases, when exposed to variation in constraints, people are not looking for creative motor actions, but discover them while doing an effort to satisfy constraints. For future research, this paper achieves two important aspects: it delineates how adaptive (movement) variability is at the heart of (motor) creativity, and it sets out methodologies toward stimulating adaptive variability. (shrink)

The role of the cerebellum as a comparator of desired motor output and actual performance may be most important during learning of a novel motor task, when movement errors are common and corrective movements are produced to compensate for them. It is suggested that PET and recent fMRI data are compatible with such an interpretation. Increased activity in motor cortical areas during motor learning indicates that these areas also contribute to the learning process, [THACH].

A considerable challenge confronts, any developing neuron. Before it can establish a functional and specific connection, it must extend an axon over tens and sometimes hundreds of microns through a complex and mutable environment to reach one out of many possible destinations. The field of axonal guidance concerns the control of this navigation process. To satisfactorily identify the cell interactions and molecular mechanisms that mediate axonal guidance, it is essential to first identify the pertinent cell populations. Embryonic surgeries have provided (...) solid information on which tissues are critical and which are irrelevant to the navigation of motor axons within the chick embryo. The gross anatomical nerve pattern is established as axons respond to both positive (path) and negative (barrier) tissue environments. Analysis of the interactions of motoneurons with these tissues reveals that several cellular interactions – chemotaxis, substratum preference, and perhaps contact paralysis – are important to the common patterns of motor axon advance. Axons simultaneously interact with population‐specific cues that have begun to be identified on the tissue level. (shrink)