Greg Shoemaker

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Two experiments investigated and development of positive and negative contrast effects in the consummatory behavior of juvenile and adult rats. Over a 4-day session, animals were given alternating 30-sec presentations of 2 bottles containing either 32 or 4% sucrose solutions. In Experiment I, different groups of rats were tested both cross-sectionally and(More)
The rate of habituation and rehabituation and the magnitude of dishabituation were investigated in four-month-old infants (24 boys, 24 girls) as a function of stimulus preference. Infants were habituated to either a preferred or nonpreferred stimulus and rehabituated with the opposite stimulus. Infants initially viewing a preferred stimulus required more(More)
Rats (eight male, eight female) were trained to lick 32% and 4% sucrose solutions for three minutes per day on four consecutive days. Measures of the number of licks revealed robust positive and negative contrast effects. Analysis of the burst-pause pattern of licking revealed that the decrease in licking characteristic of the negative contrast effect(More)
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