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91.
Data were collected shedding light on the brain electrical activity underlying word recognition. Subjects listened to a list of 48 spoken words in six random orders under two instructional sets: first to "think about the meanings of the words," and second, to learn the list. The scalp EEG associated with hearing and identifying the words was recorded at F3, F4, Cz, P3, P4, Pz, and Oz. Standard within-subjects time-locked averaging across words showed a late negative-positive complex with N2-P3 topography, the negative component peaking around 480 msec, the positive component peaking around 830 msec. Averaging within words across subjects uncovered considerable latency variability in both components. Within-word N2 and P3 component latencies covaried with word durations and with the "recognition points" predicted for the words by the "cohort theory" of word recognition. N2 latencies corresponded closely to the "N400" effect elicited with semantically incongruous sentence-final spoken words. Implications for ERP investigations of language processing are discussed. 相似文献
92.
Complementary metal oxide semiconductor (CMOS) logic provides an efficient and convenient technology for the generation of schedules of reinforcement. A single circuit provides a module capable of use as either a fixed-interval timer or one generating a differential reinforcement of low-rate schedule. A second circuit provides for a programmable variable-interval generator with 16 independent intervals. Both modules are fully compatible with previously described circuits for ratio schedules. 相似文献
93.
Catania AC Owens MC Von Lossberg V 《Journal of the experimental analysis of behavior》1983,39(2):251-256
In an autoshaping procedure with pigeons, trials consisted of the illumination of two keys, each with a different color, and then a response-independent feeder operation. Over successive conditions, all key-color pairs were arranged from the set of amber, red, green, and blue lamps. During sessions with a given pair, the left-right configuration of the colors varied irregularly, and the two colors alternated in illuminating the feeder. With one red and one green key, for example, red appeared sometimes on the left and sometimes on the right, and the feeder was alternately lit red or green on successive trials. Both total pecks and proportion of trials with at least one peck on a key of a given color were generally greater for red and amber than for green and blue, and relations among preferences were generally transitive across different color pairs. Repeating the procedure with decreased red and amber intensities and increased green and blue intensities reduced red and amber pecking relative to green and blue pecking, implying that differences in responding were determined more strongly by intensive than by chromatic properties of the stimuli. 相似文献
94.
Changes in perceived depth as a function of exposure duration were compared for two stimulus conditions. In one. a depth interval between two points of light was produced by the retinal disparity cue, and in the other condition, otherwise identical to the first, the light points were connected by a thin luminous line. The principle finding was that the perceived depth interval between the light points increased as a function of exposure durations greater than 1 sec, while no change in the perceived depth interval between the end points of the line occurred. The results were interpreted in terms of a greater equidistance tendency (ET) operating for the line than for the point condition. It was concluded that both the ET and the retinal disparity cue increase in strength as a function of exposure duration. 相似文献
95.
Daniel S. Shaw Emily B. Winslow Elizabeth B. Owens Joan I. Vondra Jeffrey F. Cohn Richard Q. Bell 《Journal of abnormal child psychology》1998,26(2):95-107
The present study examined pathways leading to early externalizing problems from age 1 to 31/2 in a design that took advantage of our knowledge of normative progression and normative socialization as well as findings from research on risk. A sample of 130 low-income participants was followed longitudinally from 12 to 42 months using observational measures of developmentally salient parenting and child disruptive behavior to predict early externalizing problems. Results are best accommodated by concepts such as transformation and transaction from developmental psychology. For boys, both child and parent variables predicted later externalizing. For girls and boys, the interaction between child noncompliance and maternal rejection was significant. 相似文献
96.
Relations between infant irritability and maternal responsiveness at 12 and18 months were investigated in low-income mother-infant dyads. Emphasis was placed on whether results varied according to measurement strategies, infant gender, or level of maternal social support and satisfaction with that support. Irritability was measured separately through observation and maternal report, responsiveness was measured observationally, and maternal social support and satisfaction were self-reported via questionnaire. Concurrent relations between irritability and responsiveness were, in general, negative and were larger when irritability was measured observationally rather than by maternal report. Correlations were similar across gender. No longitudinal relations were found between irritability and responsiveness. Amount of maternal social support was weakly related to responsiveness and to responses to infant irritability, and the nature of these relations was unexpected. Irritability-responsiveness relations varied as a function of measurement strategies, which may in part explain mixed findings in the empirical literature. 相似文献
97.
98.
To obtain some information concerning the antecedents of various forms of vocational interests, scores on the 22 basic interest scales of the Strong Vocational Interest Blank (SVIB) were correlated with 389 life history or autobiographical data items. Items yielding significant correlations were clustered on the basis of item content. The clusters obtained for the business management, science, and adventure scales are presented and discussed. Subsequently, certain general conclusions are drawn concerning the life history correlates of inventoried vocational interests. 相似文献
99.
Monkeys show an oblique effect. 总被引:1,自引:0,他引:1
Monkeys aligned a cursor bar with high-contrast square-wave gratings presented in a variety of orientations. Alignment time increased with increasing spatial frequency from 6 to 24 cycles deg-1 regardless of the orientation of the grating. At higher spatial frequencies, alignment tasks took longer for obliquely oriented gratings than for horizontal and vertical ones. Reducing grating contrast by blurring the image of the 24 cycle deg-1 grating also produced longer alignment times for the obliques. These data indicate that monkeys have an oblique effect similar to that found in humans, implying that the monkey is a useful animal model for investigating the development of meridional anisotropies. 相似文献
100.
Circuits are described that extend earlier designs for schedule-generating equipment using complementary metal oxide semiconductor (CMOS) logic. Specifically, the circuits consist of a variable-ratio generator and a series of circuits providing ancillary equipment, including a simple elapsed-timer meter, a logic probe, a variety of logic functions, a pulse generator, and circuits for interfacing. All circuits are compatible with those previously described. 相似文献