In several recent experiments we have found that the eyes are often captured by the appearance of a sudden onset in a display, even though subjects intend to move their eyes elsewhere. Very brief fixations are made on the abrupt onset before the eyes complete their intended movement to the previously defined target. These results indicate concurrent programming of a voluntary saccade to the defined saccade target and an involuntary saccade to the sudden onset. This is inconsistent with the idea (...) that a single salience map determines the location of a saccade in a winner-take-all fashion. Other results indicate that subjects attend to more than one location in a display during saccade preparation, contrary to the claim that covert attentional scanning plays no role in saccade generation. (shrink)

Purpose: Studies of reactive and proactive modes of inhibitory control tend to show age-related declines and are accompanied by abnormalities in the prefrontal cortex. We explored which mode of inhibitory control would be more amenable to change and accrue greater benefits following engagement in a 4-week theater acting intervention in older adults. These gains were evaluated by performance on the AX-CPT task. We hypothesized that an increase in proactive control would relate to an increase in AY errors and a decrease (...) in BX errors. In contrast, an increase in reactive control would be associated with a decrease in AY errors, no change in AY reaction time, and an increase in BX response time. Further, we posited that an increase in behavioral proactive control would accompany greater cue versus probe activity for previously identified regions in the prefrontal cortex. In contrast, an increase in behavioral reactive control would be accompanied by greater probe activation in these identified brain areas.Materials and Methods: The participants were 179 community-dwelling adults aged 60–89 years who were on average, college-educated. Participants were pseudo-randomly assigned to either an active-experiencing acting intervention condition or the active control condition ; participant assignment was subject to time of enrollment. Participants in both groups were trained by theater-actor researchers with expertise in acting interventions. In contrast to the active control participants who attended a course on theater acting, the acting-intervention group was required to consistently deploy proactive and reactive control mechanisms. Both groups met two times/week for 75-min for 4 weeks. Participant brain-behavioral performance on the AX-CPT task was evaluated prior to and after this four-week period.Results: No intervention effects were found in favor of proactive control. Behavioral evidence in favor of reactive control was weak. Brain-related benefits to reactive control was illustrated by greater probe-activation in Brodmann areas 6 and 8, relative to controls and pre-intervention.Conclusion: We found some evidence for improvements in reactive control via brain measures, attributed to engagement in the acting intervention. (shrink)

Human skin is the one authentic criterion of the universe which philosophers recognize when they appraise knowledge under their professional rubric, epistemology. By and large—except for a few of the great Critics and Sceptics—they view knowledge as a capacity, attribute, possession, or other mysterious inner quality of a “knower”; they view this knower as residing in or at a “body”; they view the body as cut off from the rest of the universe by a “skin”; all of which holds for (...) philosophizing physicists and physiologists even as for the professionals of the arcanum itself. If this assertion seems crude, one may recall that there are times when a bit of crudity is a fair physic for an inflamed subtlety. In the case before us the factual crudity lies in the use of “skin” for a criterion, not in our calling attention to the fact. The “skin” that is so used is, indeed, that of ancient anatomical schematism, unaffected by the transformation of understanding which modern physiological research has brought about. Yet if philosophers cease thus crudely to employ it, all their issues of epistemology will vanish, and the very type of attack they make on cognition will be discredited; whereupon the task of determining the status of knowledge itself will pass from their hands to those of the scientists who have taken over so many regions of philosophical arrogation in the past. This is what I propose here to show. (shrink)

One is tempted to look upon the positive and the logical somewhat as one looks upon the quick and the dead. Yet the issue is hardly that sharp. Viability has strange possibilities and varied forms, and must often be appraised with an eye directed as much towards the environment as towards the claimant organism. Stretching the application of the word ‘viable’ to complexes of behavior such as the philosophies and theories of knowledge, we may ask: Is the combination of the (...) positive and the logical in logical positivism viable? And is this logical positivism itself as it stands either positive or logical? (shrink)

Most discussions of Dewey's Logic evade what I take to be its main characteristic. This is its crass display of our intellectual activity as a going process—as living inquiry—literally, biologically, as life. It is the blunt, forthright treatment of even our most formal logical procedures as events occurring within that new world of knowledge that Darwin opened up and that Peirce sketched in his fallibilism, his pragmaticism, and his late-life efforts to attain a functional logic. Lacking are the trailing clouds (...) of logical and philosophical glory; present is only the bare body of inquiry. (shrink)

Among the subject matters which logicians like at times to investigate are the forms of postulation that other branches of inquiry employ. Rarely, however, do they examine the postulates under which they themselves proceed. It long contented them to offer something they called a “definition” for logic, and let it go at that. They might announce that logic dealt with the “laws of thought,” or with “judgment,” or that it was “the general science of order“; More recently they are apt (...) to connect it in one or another obscure way with linguistic ordering. (shrink)

When the layman reads a book or two of popularized physics and then moves solemnly forth, as occasionally happens, to expound some comprehensive doctrine purporting to be built directly out of the materials he has picked up, the type of comment which the physicist will make is plain enough in advance. But why does it so rarely occur to the physicist that others may think of his epistemologizing much what he is sure to think of their quantizing?

Philosophical discussions of akrasia over the last fifteen years have focused on certain skeptical arguments which purport to question the possibility of a kind of akratic action which, following Pears, I call 'last ditch akrasia' (Pears [38]). An agent, succumbing to last ditch akrasia, freely, knowingly, and intentionally performs an action A against his better judgment that an incompatible action B is the better thing to do. (See Audi [1] for a detailed analysis.) Last ditch akrasia is not the only (...) kind that has been discussed. Some philosophers (Mele [32], Scaltas [48]) have been concerned with a more extreme form of akratic action, viz. one in which the agent not only judges that action B is best, but in addition intends (chooses, decides) to B. Some have even questioned whether freely acting against one's better judgment is sufficient for akratic action (Schiffer [49]: 201-3).1 Weaker types of akratic action have been discussed, though to a much lesser extent, since they are thought less problematic. Pears distinguishes last ditch akrasia from what he calls, "motivated irrational action" ([38]: 160). In cases of the latter, the akrates' rebellious desire infects his prior reasoning and thinking in such a way that his contemplated action seems to him warranted, and he acts accordingly. (For a taxonomy of cases of akratic action, see Rorty ([44])). Nor has the discussion of akrasia been restricted to akratic action. Philosophers have discussed whether akrasia can be exhibited in the formation of intentions, wants (See Audi [1]: 181-185), and beliefs (Mele [32]: ch. 8; Heil [19]). The primary focus in this paper is on last ditch akratic action. (shrink)