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61.
62.
The depth of visual information processing is identified with the longest randomly-generated binary-encoded spatial pattern whose partial repetitions can be detected. In contrast with the auditory detection of sequentially-presented constraints, the depth of perceptible visual encoding of spatially-presented constraints is sharply limited. Depths of about 35 were achieved for one-dimensional constraints; depths of perhaps 3 or 4 were achieved for two-dimensional constraints imposed in only one direction and depths of perhaps 2 for two-dimensional constraints imposed in two directions. With one-dimensional constraints, it is shown that the inferred depth of processing is partially determined by the number of pattern representations and by the spatial distance between successive representation for visual displays of fixed size. 相似文献
63.
Irwin Pollackt 《Attention, perception & psychophysics》1971,9(5):430-434
High-frequency seven-letter words were displayed letter by letter in scrambled temporal orders upon an oscilloscope. After each incorrect identification, the sequence was repeated. Highest word-identification scores were obtained with initial and terminal starting positions, with shortest and longest spacingbetween successive letters, and at the slowest and fastest rates of letter presentation. The relative contribution of each variable was maintained in combination with other variables. The conditional probability of a correct word identification, given that the word was not identified on a previous presentation, plunges sharply with successive presentations. This apparent nonindependence of performance over successive presentations is, however, shown to be an artifact of pooling the results of heterogeneous experimental variables. 相似文献
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The loudness of a 1000-Hz tone at weak sound pressures and its softness at intense ones were scaled by the method of magnitude estimation. Estimates of loudness plotted as a function of sound pressure on double logarithmic coordinates showed the well-documented steepening near threshold. A similar steepening occurred in the softness function at high intensities. Stevens’ law, which is linear on these coordinates, could be recovered either by translating the pressure scale to a new origin, or by translating the response scale. Translations of the response scale were preferred because they produced functions in which loudness and softness were reciprocally related, whereas transformations of the stimulus made the softness function almost three times as steep as the loudness function. 相似文献
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Hodgkinson (1998) argues that we should have transformed the SINDSCAL source weights we used for an analysis presented on page 15 of our paper on the judgement of HIV cases (Irwin, Jones, and Mundo, 1996). In this reply we present theoretical and empirical arguments for why we did not transform the weights. Our statements are presented in the context of a more general discussion of how source weights should be interpreted and used. © 1998 John Wiley & Sons, Ltd. 相似文献
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69.
Waldman ID Nigg JT Gizer IR Park L Rappley MD Friderici K 《Cognitive, affective & behavioral neuroscience》2006,6(1):18-30
There is resurgent interest in the psychiatric literature in endophenotypes, variables thought to more strongly reflect the
effects of candidate genes than do manifest disorders. In a sample of 176 children with attention deficit hyperactivity disorder
(ADHD) and 52 of their siblings, we examined the validity of several putative endophenotypes for ADHD that represent commonly
used clinical measures of multiple cognitive/neuropsychological domains of executive functions (EFs). We review their distributional
normality, their relations to ADHD symptoms in probands and unaffected siblings relative to nonADHD controls, and their correlation
in siblings. We also tested the EF measures’ associations with the ADRA2A gene and whether they mediated or moderated the associations between ADHD and ADRA2A. Several EF measures showed association with ADRA2A, as well as moderation, but not mediation, of its association with ADHD. Implications of the results for evaluating the validity
and utility of putative endophenotype measures and for finding candidate gene effects on ADHD are discussed. 相似文献
70.
Irwin P. Levin 《Memory & cognition》1974,2(4):786-790
Ss were presented sets of numbers said to represent sample price information from grocery stores. Ss rated the relative desirability of shopping at each of a series of stores and were also asked to make paired-comparison preference choices. In Experiment I, some sets contained favorable information, some contained unfavorable information, and some contained neutral information added to the favorable or unfavorable information. The addition of neutral information led to a decrease in the polarity of responses. This is consistent with an averaging, but not an adding, formulation of how the information is integrated. In Experiment II, sets of favorable or unfavorable information varied in size and a set-size effect was obtained. The greater the amount of favorable or unfavorable information, the more extreme the response. This was accounted for by assuming that an initial neutral expectancy is averaged with the information presented. 相似文献