Repeated post or presession cocaine administration: Roles of dose and fixed-ratio schedule

Article Abstract:

Repeated postsession administration of a relatively small dose of cocaine to pigeons responding under a multiple fixed-ratio5, fixed-ratio 100 schedule of food presentation generally resulted in tolerance to the rate-decreasing effects of the drug. Effects of repeated administration of cocaine to animals behaving under operant contingencies depends on when the drug is given.

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Building blocks of self-control: increased tolerance for delay with with bundled rewards

Article Abstract:

An experiment with rats demonstrates an important building block of self control. Hyperbolic discounting suggested that impulsive choices occur less when organisms choose between a series of small-sooner reward (SS) versus larger-later reward (LL) all at once than when they choose between single SS versus LL pairs.

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Quantitative analyses of matching-to-sample performance

Article Abstract:

A study was conducted on pigeons who had to perform a matching-to-sample (MTS) task that involved patterns of dots on a liquid crystal display. The implications of the study are presented.

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