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301.
Bhatt RS Hayden A Reed A Bertin E Joseph J 《Journal of experimental child psychology》2006,94(2):91-113
Object parts are signaled by concave discontinuities in shape contours. In seven experiments, we examined whether 5- and 6 1/2-month-olds are sensitive to concavities as special aspects of contours. Infants of both ages detected discrepant concave elements amid convex distractors but failed to discriminate convex elements among concave distractors. This discrimination asymmetry is analogous to the finding that concave targets among convex distractors pop out for adults, whereas convex targets among concave distractors do not. Thus, during infancy, as during adulthood, concavities appear to be salient regions of shape contours. The current study also found that infants' detection of concavity is impaired if the contours that define concavity and convexity are not part of closed shapes. Thus, for infants, as for adults, concavities and convexities are defined more readily in the contours of closed shapes. Taken together, the results suggest that some basic aspects of part perception from shape contours are available by at least 5 months of age. 相似文献
302.
Rats were trained to emit a series of three-response sequences to a criterion (i.e., more than 80% of all emitted sequences correct over five successive sessions). Each rat was trained on a series of different, three-response sequences. After the final three-response sequence was acquired, two extinction tests were administered, and the three-response sequences that re-emerged during these extinction tests were noted. Resurgence effects during extinction were observed; that is, the previously trained sequences were emitted. These resurgence effects followed an orderly pattern, which involved a primacy effect. The rats initially emitted the immediately previously trained response, but then started to emit the response sequence they first were trained to emit. Thus, resurgence behavior during extinction can be an orderly function of previous training history. These results replicate those previously obtained with human subjects. 相似文献
303.
Reed GS 《Journal of the American Psychoanalytic Association》2006,54(2):447-56; discussion 457-62
304.
Hunt RR Lamb CA 《Journal of experimental psychology. Learning, memory, and cognition》2006,32(2):249-258
Prominent views of implicit priming agree that repetition of category exemplars should increase the probability of the exemplar coming to mind on a category production test. This prediction has been borne out in the data of numerous experiments that have used relatively high-frequency exemplars, but experiments that have used lower frequency exemplars have reported reduced or no priming on category production tests. Frameworks of memory disagree on why frequency would affect priming. The authors report 3 experiments, the first of which shows no priming of low-frequency exemplars under circumstances that yield priming of higher frequency instances. The second 2 experiments show that low-frequency instances can be primed, but the prior experience must bias the comprehension of the category label, not the exemplar. 相似文献
305.
306.
The purpose of this study was to resolve a paradox in the literature on the effects of body orientation on spatial attention. Neuropsychological studies have found that real or simulated trunk rotation relieves contralesional inattention in patients with unilateral neglect, suggesting that trunk orientation affects how attention is allocated to space. However, in two previous studies, trunk orientation did not affect spatial attention in other populations. In this study, we investigated the effects of trunk orientation on the performance of a covert attention task by neurologically intact adults. The covert attention task allowed the evaluation of the effects of trunk orientation on both the allocation of attention to space and the ability to shift that attention to new locations. As in previous research, trunk orientation did not affect participants' response times (RTs) to validly cued targets. However, rotating participants' trunks to the left increased their RTs to invalidly cued targets on the right and decreased their RTs to invalidly cued targets on the left. These results indicate that trunk orientation induces directional biases in the ability to shift attention. Thus, for intact participants, trunk rotation created lateral biases in the covert attention task similar to those seen in neglect patients. 相似文献
307.
Belar C Brown RA Hersch LE Hornyak LM Rozensky RH Sheridan EP Brown RT Reed GW 《Professional psychology, research and practice》2001,32(2):135-141
Society expects autonomous professions to ensure the competency of it practitioners, and professions should facilitate the continuing education and training of its members. Given the shift from psychology as a mental health profession to that of a health profession, the authors propose a self-assessment model for the individual practitioner to gauge his or her readiness to provide professional service in expanded areas of practice. This model could also be useful to the American Psychological Association, state psychological associations, and other purveyors of continuing education programs in systematically developing postgraduate experiences. A template for self-assessment that reflects well-accepted core domains of knowledge and skills is presented. 相似文献
308.
309.
Speech perception in rats: use of duration and rise time cues in labeling of affricate/fricative sounds
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Reed P Howell P Sackin S Pizzimenti L Rosen S 《Journal of the experimental analysis of behavior》2003,80(2):205-215
The voiceless affricate/fricative contrast has played an important role in developing auditory theories of speech perception. This type of theory draws some of its support from experimental data on animals. However, nothing is known about differential responding of affricate/fricative continua by animals. In the current study, the ability of hooded rats to "label" an affricate/fricative continuum was tested. Transfer (without retraining) to analogous nonspeech continua was also tested. The nonspeech continua were chosen so that if transfer occurred, it would indicate whether the animals had learned to use rise time or duration cues to differentiate affricates from fricatives. The data from 9 of 10 rats indicated that rats can discriminate between these cues and do so in a similar manner to human subjects. The data from 9 of 10 rats also demonstrated that the rise time of the stimulus was the basis of the discrimination; the remaining rat appeared to use duration. 相似文献
310.
Reed P 《Journal of the experimental analysis of behavior》2003,79(3):367-382
Four experiments examined the effect on rats' response rate of presenting a brief (500 ms) stimulus simultaneously with the delivery of food on fixed-interval (FI) schedules. In Experiment 1, reinforcement signals that were spatially diffuse (both tones and lights) elevated rates of responding, but responding was attenuated by localized visual stimuli. The remaining experiments examined the signal-induced potentiation of responding. In Experiment 2, a tone reinforcement signal potentiated response rates on an FI schedule, but attenuated response rates on a variable-interval (VI) schedule. This difference was obtained even though the overall rate of responding was equated on the two schedules before the introduction of the signal. Signal-induced potentiation of responding occurred over a range of FI values employed in Experiment 3. In Experiment 4, presenting a reinforcement signal when high local rates of response had occurred immediately before reinforcement resulted in potentiated rates of responding on an FI schedule. The opposite effect on response rate occurred when the reinforcement signal followed only low local rates of response. These results indicate that a variety of factors influence the effects of a reinforcement signal. They imply, however, that the local rate of response at the time of reinforcement is a key factor in establishing the nature of the signaling effect. 相似文献