The maximization of overall reinforcement rate on concurrent chains

We model behavioral allocation on concurrent chains in which the initial links are independent variable-interval schedules. We also quantify the relationship between behavior during the initial links and the probability of entering a terminal link. The behavior that maximizes overall reinforcement rate is then considered and compared with published experimental data. Although all the trends in the data are predicted by rate maximization, there are considerable deviations from the predictions of rate maximization when reward magnitudes are unequal. We argue from our results that optimal allocation on concurrent chains, and prey choice as used in the theory of optimal diets, are distinct concepts. We show that the maximization of overall rate can lead to apparent violations of stochastic transitivity.     

Evaluation of a sound-generator chip: The AY 3-8910

Despite the continuing decrease in computer prices, psychoacoustic research is still expensive because of the high cost of sound-generation equipment and software. A single-chip sound generator was evaluated as an inexpensive tone/noise generator, amplitude attenuator, envelope modulator, and sound mixer. Although the chip has some limitations, it offers important advantages for pilot research and laboratory demonstrations.     

Precategorical acoustic storage (PAS)

A system for precategorical storage of acoustic information is described. Material in this store is subject to overwriting and to decay with time. Precategorical Acoustic Storage (PAS) receives information only from the ears; it is not affected by silent rehearsal or by visual stimulation, and is explicitly distinguished from storage in terms of articulation. Two experiments are reported in which these properties of PAS are tested. Postulation of PAS permits an account of serial position functions for visual and auditory presentation in immediate memory, a distinction between “recency” and “flnality” effects, the differential effects of a redundant prefix and a redundant suffix, effects of vocalization at presentation and at recall, and the relation between memory confusions and speech perception. Implications for a general theory of human memory are discussed.     

Some suggestions for modifying the incremental influence of organizational members

The purpose of this series of three studies was to examine ways of modifying incremental influence. The first was an experimental laboratory study involving manipulation of interpersonal attraction via perceptions of similarity. Results from Study I strongly supported the hypothesis that referent power can be changed as a function of interpersonal attraction. Study II reports on an organizational simulation and provides further evidence for the linkage between interpersonal attraction and referent power. This study also tested the hypothesis that satisfaction covaries with self-perceived referent power. The data, while supporting the hypothesis, expanded the association of satisfaction to the other power bases, i.e., expert, reward, coercive, and legitimate. The final study examined power changes as a function of organization development interventions in a field setting. The findings show that not only was referent power enhanced, as hypothesized, but that other power bases also changed. In addition, hypotheses previously tested in Studies I and II received further confirmation in Study III. The overall pattern of results suggests that referent power can be altered by affecting the interpersonal attraction of group members. Implications for organizational intervention and practice are discussed, and some possible modifications to the theoretical framework of power are advanced.     

Intergroup and intragroup competition and cooperation

This study examined the effects on group performance and evaluation of three factors: intergroup competition or cooperation, intragroup competition or cooperation, and task means-interdependence. Intragroup cooperation was related positively to performance on a high means-interdependent task and was related negatively to performance on a low means-interdependent task. However, this relationship held only when there was intergroup cooperation rather than intergroup competition. These results were discussed in terms of their implications for the relative magnitude of the motives produced by the intragroup and intergroup reward structure. Evaluations of ingroup members were higher when there was intragroup cooperation than when there was intragroup competition. To foster ingroup liking, it was not necessary to introduce intergroup competition.