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911.
Jeffrey M. Spielberg Jennifer L. Stewart Rebecca L. Levin Gregory A. Miller Wendy Heller 《Social and Personality Psychology Compass》2008,2(1):135-153
This article provides a selective review of the literature and current theories regarding the role of prefrontal cortex, along with some other critical brain regions, in emotion and motivation. Seemingly contradictory findings have often appeared in this literature. Research attempting to resolve these contradictions has been the basis of new areas of growth and has led to more sophisticated understandings of emotional and motivational processes as well as neural networks associated with these processes. Progress has, in part, depended on methodological advances that allow for increased resolution in brain imaging. A number of issues are currently in play, among them the role of prefrontal cortex in emotional or motivational processes. This debate fosters research that will likely lead to further refinement of conceptualizations of emotion, motivation, and the neural processes associated with them. 相似文献
912.
Gordon E. Legge Cindee Madison Brenna N. Vaughn Allen M. Y. Cheong Joseph C. Miller 《Attention, perception & psychophysics》2008,70(8):1471-1488
Previous studies of tactile acuity on the fingertip, using passive touch, have demonstrated an age-related decline in spatial resolution for both sighted and blind subjects. We have reexamined this age dependence with two newly designed tactile-acuity charts that require active exploration of the test symbols. One chart used dot patterns similar to braille, and the other used embossed Landolt rings. Groups of blind braille readers and sighted subjects ranging from 12 to 85 years old were tested in two experiments. We replicated previous findings for sighted subjects by showing an age-related decrease in tactile acuity by nearly 1% per year. Surprisingly, the blind subjects retained high acuity into old age, showing no age-related decline. For the blind subjects, tactile acuity did not correlate with braille reading speed, the amount of daily reading, or the age at which braille was learned. We conclude that when measured with active touch, blind subjects retain high tactile acuity into old age, unlike their aging sighted peers. We propose that blind people's use of active touch in daily activities, not specifically braille reading, results in preservation of tactile acuity across the life span. 相似文献
913.
In Experiment 1 each rat received two different fixed series of three trials each. The unconditioned stimulus occurred on
Trial 1 of one series and on Trial 3 of the other series, all other trials being nonreinforced. Previous Pavlovian investigations
have shown that rats can remember the immediately prior reward outcome and anticipate the immediately subsequent reward outcome.
Experiment 1 demonstrated that rats could remember and anticipate even more remote reward outcomes. In Experiment 2 two groups
received a series of two nonrewarded trials followed by a rewarded trial. It was demonstrated that a change in the conditioned
stimulus (CS) from Trial 2 to Trial 3, which occurred in one group, produced weaker responding than in the other group that
did not experience such CS change. On the basis of these findings it was suggested that the rats organized the trials of a
series into a unit or chunk. This was concluded for two reasons. First, remembering and anticipating remote reward outcomes
strongly suggests that responding is being controlled by events extending beyond the current trial. Secondly, the experimental
manipulations employed in the Pavlovian situation here are similar to those used in prior human learning and animal instrumental
learning investigations concerned with chunking. Thus, it would appear that chunking is a ubiquitous phenomenon appearing
in human serial learning (e.g., Bower and Winzenz 1969; Crowder 1976), in animal instrumental learning (e.g., Capaldi 1992; Hulse and Dorsky 1977; Terrace 1987), and now in Pavlovian learning. 相似文献
914.
Response grouping is a ubiquitous phenomenon in psychological refractory period (PRP) tasks, yet it hampers the analysis of dual-task performance. To account for response grouping, we developed several extended versions of the standard bottleneck model, each of which incorporates a possible grouping mechanism into this model. Computer simulations were used to assess how the predictions of the standard model would change with each grouping mechanism. One set of simulations investigated the basic effects of grouping on the means and intercorrelation of the reaction times in the two tasks, as well as the percentage of trials with short interresponse times (IRTs). A second set of simulations examined whether response grouping would invalidate the use of PRP paradigms for localizing experimental effects. Finally, we investigated whether the post-hoc elimination of trials with short IRTs removes the contaminating effects of response grouping. 相似文献
915.
Selection in multiple-item displays has been shown to benefit immensely from advance knowledge of target location (e.g., Henderson, 1991), leading to the suggestion that location is completely dominant in visual selective attention (e.g., Tsal & Lavie, 1993). Recently, direct selection by color has been reported in displays in which location does not vary (Vierck & Miller, 2005). The present experiment investigated the possibility of independent selection by color in a task with multiple-item displays and location precues in order to see whether color is also used for selection even when target location does vary and supposedly dominant location precues can be used. Precues provided independent information about the location and color of a target, and each type of precue could be either valid or invalid. The precues were followed by brief displays of six letters in six different colors, and participants had to discriminate the case of a prespecified target letter (e.g., R vs. r). Performance was much better when location cues were valid than when they were invalid, confirming the large advantage associated with valid advance location information. Performance was also better with valid advance color information, however, both when location cues were valid and when they were invalid. But these color benefits were dependent on the closeness of the colored letter to the cued location. Our results thus suggest that selection by color in a multiple-item display, where location and color information are independent from each other and equalized, is mediated by location information. 相似文献
916.
917.
There are clear indications that both the reported incidence of autism in children and litigation involving this developmental disorder are increasing. However, to date there has been a dearth of research analyzing court cases and legal decisions concerning students with autism. The purpose of this review was to examine published hearing/review and court decisions concerning autism eligibility in educational settings in relation to empirically supported best practices in the assessment of autism. A total of 13 cases were identified for inclusion in the review. In general, the results indicated that hearing/review officers and judges neither relied upon nor explicitly acknowledged empirically supported assessment methods in their published eligibility decisions. It appeared that many hearing/review officers and judges relied on expert witnesses, who may or may not have had particular expertise and knowledge regarding current best practices in autism eligibility assessment. Implications of the findings and areas for future research are discussed. 相似文献
918.
Dale E. Miller 《Ratio》2003,16(1):49-62
After critiquing some earlier attempts (including those of Marcus Singer and Frances Howard–Snyder) to ground objections to actual–consequence act utilitarianism (ACAU) on human cognitive limitations, I present two new objections with this same foundation. Both start with the observation that, because human cognitive abilities are not up to the task of reliably recognizing utility–maximizing actions, any agents who are recognizably human – including the best possible humans, morally speaking – are certain to perform many actions every day that ACAU says are immoral, and to perform some actions over the course of their lives that it says are highly immoral. The first objection is that, if Mill's analysis of what it means to call an action wrong is accurate, then ACAU entails a conclusion that no one will accept, viz., that the morally–best humans possible ought to undergo constant punishment. The second objection is that ACAU entails that even the morally–best humans possible are bad moral agents in some respect. This conclusion, while unpalatable, is not so obviously unacceptable as the first. However, I do briefly consider some ways in which it might be possible to demonstrate that it is false and thereby complete a reductio of ACAU. 相似文献
919.
Steven D Brown Nancy E Ryan Krane Paul Castelino Matthew Miller 《Journal of Vocational Behavior》2003,62(3):411-428
Recent meta-analyses of the career choice intervention literature (Brown & Ryan Krane, 2000; Ryan, 1999) identified five intervention ingredients that were individually associated with career choice outcome, and collectively were linearly related to increases in career choice effect sizes. In this article, we summarize these meta-analytic findings, present analyses that further confirm these ingredients’ importance, and present some hypotheses to define each of the critical ingredients and suggest how they might be implemented to maximize their effectiveness. 相似文献
920.