Maternal vitamin A excess during the early fetal period: effects on learning and development in the offspring.
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Abnormalities, Drug-Induced↗
Biomedical subjects
J Gibbon
Publications and source records attributed to J Gibbon.
Preliminary study of behavioral and teratogenic effects of two "stress" procedures administered during different periods of gestation in the rat.
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Animals↗
Temporal order judgement and reaction time.
A model which predicts judgment of the temporal order of stimuli from simple reaction time is proposed. Visual data show covariation of the two measures with luminance changes, and suggest that (i) temporal order judgments reflect a biased response criterion and (ii) the motor component of reaction time has little variability relative to variance in receptor system latency.
Humans↗
Discriminated punishment: avoidable and unavoidable shock.
Warning stimuli for two punishment conditions were alternated with periods of appetitive responding by rats. In either warning stimulus, the first response produced a brief shock, terminated the stimulus, and started an interval during which the baseline appetitive schedule was in effect. Not responding resulted in stimuli of random duration, which terminated with a shock under one condition and without a shock under the other. Each subject was exposed to several shock intensities, with trials for the two conditions programmed during alternate portions of the session. In general, response frequency in the warning signal for either condition decreased with increasing intensity; however, at a given intensity, responding was more frequent in the stimulus invariably terminating with shock than in the stimulus terminating without shock when no response was made. The frequency difference was greatest at intensities intermediate between those producing minimal and maximal suppression.
Animals↗