Discriminative activation and maintenance of contingent self-reinforcement

The present experiment studied the process by which environmental events come to exercise some degree of control over the activation of contingent self-reinforcement. Through differential training, animals learned to impose performance requirements for self-reward in certain environmental contexts but not in others. Both contextual influences and periodic negative consequences for noncontingent self-reward increased adherence to response requisites for self-reinforcement.     

Effects of inadmissible Evidence on the Decisions of Simulated Jurors: A Moral Dilemma

In a 2 × 3 design, simulated jurors received either weak or strong evidence against a defendant in a murder case. Within each evidence condition, subjects were given either additional evidence ruled admissible, additional evidence ruled inadmissible, or no additional evidence. Results indicated that ( a ) jurors were biased by inadmissible evidcnce in the weak-evidence but not in the strong-evidence condition, ( b ) strong evidence resulted in more guilty verdicts than did weak evidence, ( c ) confidence in verdict was influenced by strength of evidence, and ( d ) confidence of guilt was positively correlated with severity of punishment. Implications of the results are discussed within the context of the judicial process.     

A high-speed computer-coinpatible event recorder

Design considerations, construction information, and programming considerations of a high-speed event recorder are presented. The device records discrete events on magnetic tape for later processing by a large computer. Although the design information is general, the instrument has 120 event channels, a time resolution of up to 100 microsec, and can record 60 or more events per second.     

The effect of texture oil the magnitude of

The magnitude of simultaneous brightness contrast was measured while the coarseness of the textural overlay was varied. Remits from 10 Ss indicate that as the size of elements in the texture increases, the amount of obtained contrast decreases. An interpretation of these results in terms of the spread of lateral inhibitory effects is offered.     

Size contrast as a function of figural similarity

Size contrast occurs in numerous configurations where a test figure appears apparently larger when surrounded by small elements and apparently smaller when surrounded by large elements. Using the Ebbinghaus illusion, the magnitude of this effect is shown to vary as a function of apparent similarity between test and inducing element.     

Relative preference for external and self-controlled reinforcement in monkeys

Monkeys were tested for their relative preference for self-monitored and externally imposed systems of reinforcement. One monkey clearly preferred to self-reward his own performances. whereas a second monkey favored slightly the externally administered system but displayed a small gradual shift toward self-reward as the sessions progressed. Unlike previous findings. unmerited self-reward did not result in rapid discarding of self-imposed performance requirements. The level of work output and the interactive effects of multiple reinforcement control are possible operative factors in sustaining self-imposed contingencies long after punishment for unmerited self-reward has been discontinued.     

Overpaid or Overworked? Cognitive and Behavioral Reactions to Inequitable Rewards1

Although early studies support the equity theory prediction that increasing rewards for task performance enhance the effort devoted to the task, these findings may be challenged on a number of counts. Social exchange theory suggests, for example, that when rewards exceed what is felt to be equitable, the recipient may increase his perception of task difficulty and his estimate of what is a fair return for his efforts. In this case, there should be little need to devote increased energy to task performance. The present study, conducted in both Italy and the United States, supports this reasoning. Compared with equitably rewarded subjects, those rewarded by either 40% or 80% over their estimate of what was fair, altered both their perceptions of task difficulty and of a fair return. No performance differences were found.     

Differentiation and decrement in the Mueller-Lyer illusion

Two experiments were conducted to test the hypothesis that decrement of the Mueller-Lyer illusion with inspection is due to learning to differentiate the test element from the accessory lines. In one experiment, the test element is predifferentiated for the observer by means of configurational variations and in the other by restriction of attention. Although the initial magnitude of the illusion is found to be inversely proportional to the amount of predifferentiation, the slopes of the decrement curves are not affected.     

The influence of optical aberrations on the magnitude of the Poggendorff illusion

The amount of blurring of the retinal image can be reduced by proper selection of an artificial pupil and a chromatic filter. Reduction of the amount of blurring due to optical aberrations by viewing through a 1-mm artificial pupil and an interference filter in the eye, results in a concomitant reduction in the magnitude of the Poggendorff illusion. The magnitude of the reduction is smaller, however, than would be expected if the illusion was predominantly determined by blur due to optical aberration.