The roles of contour and luminance distribution in determining perceived centers within shapes

Two sources of visual information that likely could be employed by the perceptual system in locating the centers of bounded shapes—boundary configuration and luminance distribution—have been perfectly confounded in every study thus far aimed at investigating perceived centters. Observers, using either a revolving or stationary x-y plotter, made judgments on the location of centers within either revolving or stationary shapes of both uniform and varied luminance distributions. Results indicate that the location of perceived centers depended predominantly upon boundary contour and was affected by the distribution of luminance within these edges to a much lesser degree.     

The effect of self- vs. external-monitoring and locus of control upon the pacing and general adjustment of psychiatric inpatients

Ninety-six psychiatric inpatients with a history of problematic pacing were identified as internal or external (Rotter Internal-External Locus of Control Scale) and assigned to one of four monitoring categories: (1) self-monitoring, in which participants recorded their pacing on wrist counters, (2) external-monitoring, in which ward staff informed participants of their pacing, (3) social demand, in which participants were pressured not to pace, but without specific feedback concerning their pacing and (4) no treatment. Dependent measures included the number of cycles paced, distance paced, and staff rated general social adjustment (MACC scale). As hypothesized, internals showed greater reductions in pacing and increases in general adjustment scores in the self-monitoring condition and externals reducing pacing and improved general adjustment on the external monitoring condition. Both of the treatment conditions created greater positive change than the social demand condition.     

When experiences of failure promote expectations of success: The impact of attribution failure to ineffective strategies1

This experiment examined the effects of attributing initial failure to ineffective strategies on performance expectancies. Subjects were induced to attribute performance at a persuasion task to either their strategies (a controllable factor) or abilities (an uncontrollable factor). Subjects then failed at their initial persuasion attempt. Following failure, strategy subjects expected more successes in future attempts than did ability subjects. Strategy subjects also expected to improve with practice, while ability subjects did not. Comparisons to control subjects, who received no attribution manipulation prior to success or failure, clarify these results. Findings suggest that subjects attributing task outcomes to strategies monitored the effectiveness of their strategies and concluded that by modifying their strategies they would become more successful. In contrast, subjects attributing task outcome to abilities failed to attend to strategic features and concluded that they could not improve. Implications of this overlooked factor for attribution theory and learned helplessness are discussed.     

Capacity and strategy for syntactic comprehension after left or right hemidecortication

The left and right hemispheres perform different encoding and decoding operations on a syntactically complex sentence in order to identify its meaning. Hemispheric asymmetry for syntax involves not only variations in capacity, but also differences in the strategy used to effect similar language performance.     

Autonomous processes in comprehension: A reply to Marslen-Wilson and Tyler

A criterion which has been proposed for distinguishing minds from computing systems is examined from the point of view of some current work on computer induction.     

THE VALIDATION OF PROCEDURES TO ASSESS PREVOCATIONAL TASK PREFERENCES IN RETARDED ADULTS

Three severely retarded young adults between the ages of 19 and 21 years participated in a prevocational training program, and worked regularly on six different tasks during the scheduled six-hour day. The study attempted to assess each subject's preferences for the six tasks: collating, stuffing, sorting, pulley assembly, flour-sifter assembly, and circuit-board stuffing. In Phase I, the procedure consisted of randomly pairing each task with all other tasks in a two-choice situation that required the subjects to select one task from each pair combination to work for a seven-minute period. The selection procedure consisted of presenting two representative task objects on a tray and requesting the subject to pick up one object and place it on the work table. The object selected represented the task worked for that period. The 15 possible pair combinations were presented randomly every two days for a period of 34 days to determine the preferences. During the validation phase (Phase II), each subject's least- and most-preferred tasks were paired separately with moderately-preferred tasks. As expected, these manipulations confirmed the baseline data, as choices for the moderately-preferred tasks decreased when consistently paired with the preferred tasks and increased when consistently paired with the least-preferred tasks.     

Order of partial and consistent reward,reward magnitude shift,and resistance to extinction

In a separate-phase runway experiment with rats, four schedules involving partial (P) and consistent (C) reward (CC, CP, PC, and PP) were crossed with three reward magnitude shift conditions (upshift, nonshift, and downshift). The data revealed three major findings: (a) Reward magnitude downshift generally led to rapid extinction; (b) consistent reward prior to partial reward (CP) resulted in slower extinction than the reverse order (PC) under conditions of reward magnitude shift (particularly downshift); and (c) the relative performance of PC and CP under conditions of reward magnitude shift was reversed from postshift to extinction. On the basis of these data it was suggested that processes not presently identified by reinforcement level theory and stimulus analyzer theory influence extinction following separate-phase acquisition. A modification of reward level theory was presented to provide an account of extinction performance following separate-phase reward reduction.