Bargaining strength and group polarization in intergroup negotiations

In the context of a labour-management simulation study, three-man union teams were made to believe that they had either a very strong or a very weak bargaining position vis-à-vis the other party. In half of each of these conditions, a cooperative and a competitive orientation toward the other group was induced. In preparation for the intergroup negotiations, the subjects were first asked to indicate their individual aspirations for three negotiation issues. After a group discussion, their collective aspirations were obtained. Regardless of the experimental conditions. groups set significantly higher aspiration levels than individuals on the most important issue but were more conservative and cautious on less important issues. In general, for all three topics, significant or near-significant interactions were found between bargaining strength and the direction of the group-induced shift. In the strong bargaining condition, groups set higher aspiration levels than the average of prior individual judgments; in the weak bargaining condition the opposite trend occurred. An effort was made to relate these findings to the various theories developed in the ‘risky-shift’ literature.     

Visual and proprioceptive adaptation to altered oculomotor adjustments

Adaptation to spectacles that alter in equivalent amounts the accommodation and the convergence with which objects are viewed was produced under two conditions. In one, S alternately pushed away or pulled toward him a screen that exhibited only a single vertical contour while wearing glaaaes that caused decreases in accommodation and convergence equivalent to 1.5 lens diopters. Here kinesthesis for these arm movements provided the only veridical distance cues, A small, but highly significant, adaptation effect was obtained with a teat in which S, before and after the adaptation period, pointed to the location of a test line in the distance dimension. Corresponding tests consisting in size and in depth estimates did not show an adaptation effect. In the other condition of adaptation, S moved objects by hand toward and away from himself while wearing spectacles that increased accommodation and convergence by the equivalent of 1.5 lens diopters. In addition to the altered oculomotor cues, some veridical visual cues for distance such as are caused by perspective were present. This condition yielded changes in size and depth estimates indicative of an adaptation in visual distance perception and a larger effect of adaptation measured by the pointing test. We concluded that the excess of the adaptation effect measured by pointing over that measured by size estimation represents an adaptation in proprioception, as did the pointing effect produced by our first adaptation condition.     

An aftereffect to discrete stimuli producing apparent movement and succession

After observing the sequential flashing of two lights that produced either the perception of apparent movement or the perception of the succession of two stationary lights, the presentation of the lights in the opposite direction produced the perception of a more rapid apparent movement or of a more rapid succession of the light flashes. These aftereffects suggest the presence of neural structures for the discrimination of sequential changes in spatial position which are subject to adaptation and respond with decreased sensitivity to the repetitive presentation of the two lights in a given spatial direction. The results are interpreted to support the hypothesis that the perception of apparent movement involves the excitation of specific neural mechanisms selectively responsive to sequential changes in stimulus position. An alternative hypothesis is that the perception of apparent movement involves an inference based on the separate registrations of the position of a stimulus at one point in time and the position of that stimulus at an earlier point in time.     

Gustatory cross adaptation: Sourness and bitterness

In five experiments, Sa were presented with a variety of sour and bitter compounds after the tongue was rinsed with distilled H₂0, QHCl, urea, or citric acid. All the acids tested were significantly less sour following adaptation to citric acid than after adaptation to distilled H₂O. The taste of these acids was not affected by rinsing the tongue with QHCl or urea. QHCl adaptation markedly reduced the bitterness of some compounds, while having little effect on others, including urea and citric acid. Both urea and citric acid had smaller but reliable effects on the bitterness of QHCI. These apparently incompatible results do not seem to be the result of a simple verbal confusion between sourness and bitterness. Some compounds were not affected by any of the adapting conditions. The coding mechanisms for the sourness of acids appears to be relatively simple, while that for bitterness is more complex.     

Orientation to visual stimuli and the superior colliculus in the rat

Rats were trained in a six-choice jumping stand apparatus to enter the dark door, and avoid the five bright doors. Rats with bilateral superior collicular lesions were found to be severely impaired in this task, although further experiments showed that they were able to discriminate bright from dark stimuli and could perform correctly if allowed to approach each door in turn. It is suggested that the superior colliculus is important in orientation to visual cues, and there is some evidence that it is involved in orientation to brightness but not visual form cues.     

Personality caracteristics of college students on academic probation

In two separate studies underclassmen on academic probation (N = 27, N = 22) were individually matched for aptitude with academically satisfactory students to investigate (a) nonaptitudinal factors differentiating probation students from matched students and (b) how probation students who eventually have to withdraw differ from those who improve. Results based on interviews, questionnaires, and self-report measures indicate that probation students have unrealistically optimistic expectations concerning grades, attribute their difficulties to academic factors rather than personal concerns, and tend to be defensive, lacking in positive motivation for academic work, and relatively dependent on their parents. Students most likely to get off probation estimated their grades most accurately and had lowest test anxiety