Temporal perturbations of binocular rivalry

Successive durations of binocular rivalry are sequentially independent, random variables. To explore the underlying control process, we perturbed the cycle during a 30-sec viewing period by immediately forcing an eye to return to dominance whenever it became suppressed. During this period of forced dominance, that eye's individual dominance durations were unusually brief, but immediately following the period of forced dominance that eye's suppression durations were unusually long. However, no long-term change in the sequential pattern of rivalry occurred, and the stochastic independence of successive durations was maintained during and following the period of forced dominance. The same pattern of results was obtained with even longer periods of forced dominance. These results are consistent with the existence of a short-term adaptation, or fatigue, process responsible for transitions from dominance to suppression.     

Determinants of Participation in Multi-Family Recycling Programs1

The determinants of recycling in multi-family residences were investigated by administering a 50-item questionnaire to 230 residents of buildings where recycling collection systems had been installed. The level of tenant participation, defined by a composite index of self-reported usage, was positively associated with income, education, recycling motivation, and cleanliness of the recycling system. It was negatively associated with the number of different types of collection containers. At the aggregate level, participation varied considerably between the complexes. These differences were largely accounted for in terms of three system support variables, specified in terms of the “user friendliness” of the recycling system, its spatial location within the complex, and the degree to which the manager supported the program. Multiple regression analysis indicated that user friendliness and manager commitment together accounted for 85.3% of the variance in the aggregate participation index. These results suggested several experimental interventions designed to increase participation in multi-family recycling programs.     

CATS PERCEIVE BIOLOGICAL MOTION

Abstract— With behavioral techniques, cats were trained to discriminate a point-light animation sequence depicting biological motion (i.e., a cat walking) from an animation sequence consisting of equivalent local motion vectors lacking the global synchrony present in the biological-motion sequence (i.e., "foil" displays). Successful discrimination was evidenced for even the most difficult foil display and for different versions of the biological-motion sequence, indicating that cats are able to extract the higher order kinematic invariants embodied in these novel motion displays.     

A neural theory of binocular rivalry

When the two eyes view discrepant monocular stimuli, stable single vision gives way to alternating periods of monocular dominance; this is the well-known but little understood phenomenon of binocular rivalry. This article develops a neural theory of binocular rivalry that treats the phenomenon as the default outcome when binocular correspondence cannot be established. The theory posits the existence of monocular and binocular neurons arrayed within a functional processing module, with monocular neurons playing a crucial role in signaling the stimulus conditions instigating rivalry and generating inhibitory signals to implement suppression. Suppression is conceived as a local process happening in parallel over the entire cortical representation of the binocular visual field. The strength of inhibition causing suppression is related to the size of the pool of monocular neurons innervated by the suppressed eye, and the duration of a suppression phase is attributed to the strength of excitation generated by the suppressed stimulus. The theory is compared with three other contemporary theories of binocular rivalry. The article closes with a discussion of some of the unresolved problems related to the theory.     

The search for meaning in (new) work: Task significance and newcomer plasticity

Using temporally-lagged data from 146 business and engineering newcomers, we found evidence for a “positive side” of plasticity theory (Brockner, 1988, p. 547) in fostering newcomer adjustment. Specifically, as predicted, we found that higher newcomer generalized self-efficacy positively moderates the association between job design (i.e., task significance of the newcomer's job) and newcomer attitudes (in our study, organizational identification, job satisfaction, intentions to quit). Our findings promote plasticity theory as readily applicable to both newcomer adjustment and positive organizational scholarship.     

Rapid acquisition of bias in signal detection: dynamics of effective reinforcement allocation

We investigated changes in bias (preference for one response alternative) in signal detection when relative reinforcer frequency for correct responses varied across sessions. In Experiment 1, 4 rats responded in a two-stimulus, two-response identification procedure employing temporal stimuli (short vs. long houselight presentations). Relative reinforcer frequency varied according to a 31-step pseudorandom binary sequence and stimulus duration difference varied over two values across conditions. In Experiment 2, 3 rats responded in a five-stimulus, two-response classification procedure employing temporal stimuli. Relative reinforcer frequency was varied according to a 36-step pseudorandom ternary sequence. Results of both experiments were analyzed according to a behavioral model of detection. The model was extended to incorporate the effects of current and previous session reinforcer frequency ratios on current-session performance. Similar to findings with concurrent schedules, effects on bias of relative reinforcer frequency were highest for the current session. However, carryover from reinforcer ratios of previous sessions was evident. Generally, the results indicate that bias can come under control of frequent changes in relative reinforcer frequency in both identification and classification procedures.