No abstract

Certain intermittent lighting schedules can produce heavier chickens than the traditional 14-hr. light—10-hr. dark regimen by providing for adequate food intake with minimum activity. This phenomenon is affected by behavioral control and is unaffected by restriction of feed during dark periods.

Correlations between I-E and Adult Locus of Control scales, and a measure of mental ability, supported the hypothesis that these scales provide alternative measures of feelings of control for adults. Support was also obtained for the hypothesis that an internal control is associated with greater mental ability.

Previous research has tested the efficacy of the deterministic-sensory model versus probabilistic-sensory-learning model for psychophysical relationships when cognitive factors were manipulated. The present study attempted to expand those findings by holding cognitive factors constant and varying a perceptual factor within a stimulus class. Subjects made magnitude estimations of skin-area contact for each of two sets of weights which varied identically in surface area but different in that one set also varied in accelerative force whereas the other did not. A power function was obtained only for that set which varied with respect to accelerative force, supporting the deterministic-sensory model. These results are consistent with those of electro-physiological studies which have related transducer activity to the dynamic component of a mechanical stimulus. It was suggested that better conceptualization of "cognitive" and "perceptual" factors is needed before further research in this area is undertaken.

Previous investigation of the deterministic-sensory and the probability-sensory-learning models of psychophysical relationships have featured the manipulation of a single cognitive cue. The present study sought to expand these findings through the manipulation of multiple cognitive cues. Subjects made magnitude estimations of skin-area contact for each of two sets which varied identically in surface area but differed in that one set also varied in accelerative force. Within sets, three treatments featured systematic variation in the presentation of cognitive cues. Power functions were obtained for all treatments and the results supported the deterministic-sensory model. It was suggested, however, that resolution of the perception versus cognition issue must await the identification of innate and conditioned correlates of the subjective response to specific sensory stimuli.