The effect of context during word perception in schizophrenic patients

Hospitalized chronic and acute schizophrenics were compared with age- and social-status-matched controls on word perception tests to measure the effect of context on recognition thresholds. In Experiment 1 the method of J. Morton (1964, British Journal of Psychology, 55, 165-180) was adopted to see how related and unrelated contexts influenced word recognition thresholds when both context and stimulus word were presented visually. Experiment 2 was an auditory analog of Experiment 1 and in addition the chronic schizophrenics were selected on the basis of a presence or absence of auditory hallucinations. The influence of context on perceptual thresholds was quite normal in all schizophrenics. However, analysis of the incorrect responses elicited showed that some schizophrenic subjects do produce bizarre or irrelevant responses or perseveration to a greater extent than their controls. These results are explained in terms of automatic and strategic modes of information processing. The automatic processes responsible for the adjustment of perceptual thresholds operate normally in schizophrenics but response production which demands strategic selection and editing of responses is prone to malfunction which results in the observed deviations in the normal use of language.     

Ratio responding as a function of concurrent avoidance schedules, yoked shocks, and ratio value

Fixed-ratio food-reinforced responding in rats was studied alone and with concurrent shock avoidance or with concurrent response-independent shocks matched to those that occurred in the avoidance condition. Under each condition, fixed-ratio size was increased over successive daily sessions. Fixed-ratio response rate generally passed through a maximum as a function of fixed-ratio size. Decreased fixed-ratio responding at values beyond the maximum occurred when (1) the time to complete a fixed ratio approximated the response-shock interval of the avoidance schedule, (2) the shock rate increased, and/or (3) the ratio requirements were so high that ratio strain occurred. Avoidance rates decreased slightly as fixed-ratio size increased.     

Genetic influences on digging behaviors in mice (Mus musculus) in laboratory and seminatural settings

Digging behaviors of several inbred strains of laboratory mice and some of their crosses were examined in three contexts. In laboratory burrow boxes, C57BL/6Abg mice constructed more sophisticated burrow systems than did BALB/cAbg mice. Their F1 hybrids built burrow systems more complex than either parental strain. The same pattern of genetic influence was observed in an outdoor pen. In an escape task that required digging, BALB/c mice escaped more quickly than did C57BL/6 mice; their F1 hybrids showed dominance toward the BALB/c phenotype. These results indicate that behavioral polymorphisms in digging behavior, which may relate to habitat selection, have a genetic basis. The dominance and overdominance toward the better digging parental strain in each type of task suggest the possible evolutionary importance of these digging behaviors.     

Generality and topic specificity of cognitive styles

A multitrait-multimethod strategy was used to assess eight structural properties of cognition applied to several classes of objects by 88 university students in Boulder, Colorado, United States, and 80 university students in Kyoto and Otsu, Japan. Each cognitive style was found to display some degree of generality over object classes and also some degree of class specificity. It is concluded that cognitive style depends on the subject, the class of objects considered, and an interaction between the two.     

Organizational Coverups: Factors Influencing the Discipline of Information Gatekeepers1

This study examines factors that influence the severity of discipline administered to a subordinate information gatekeeper who is guilty of covering up an event and concealing and distorting information. Undergraduate business students read one of eight versions of a case depicting faulty upward communication, in which three variables-the superior-subordinate dependency relationship, the subordinate's motivation, and the subordinate's remorse-were manipulated. Unethicality of the offense was evaluated to be quite high across all experimental conditions, yet mild discipline was recommended when the superior was highly dependent on his subordinate and when the subordinate acted out of altruism for his superior. Probability of reoccurrence of the infraction was judged lowest when the offending subordinate displayed remorse. These findings are interpreted as representing a pragmatic orientation toward discipline based on perceived costs or benefits to the administrator. Conditions that increase the vulnerability of decision-makers to faulty upward communication are discussed.     

Group shift to caution at the race track

Group and individual riskiness were compared on $2 “win” best at the race track. Using the standard pretest-posttest risk-shift design, group discussion to unanimous decision was found to produce a cautious shift in group bets.     

Effects of prefeeding on performance with body weight held constant

Two experiments are reported in which rats received either no prefeeding, nutritive substance prefeeding, or nonnutritive substance prefeeding prior to running in a straight alley. The running-speed data supported body weight as an overall measure of hunger drive. Performance was a function of body weight but not stomach weight or associated stomach bulk.