Application of variable criterion theory to choice reaction time

A theory of choice reaction time ICRT is presented which is based on a variable criterion model assuming the decision criterion to be normally distributed. The theory provides functions of time describing the growth of component processes following stimulus onset. For correct responses, these processes are sensory and associative strength. For errors, the processes are sensory strength, generalized associative strength, and associative inhibition. A model for separating the effects of these processes from that of response competition is presented. The theory describes, with great accuracy, the CRT distributions of correct responses and errors, not only for the experiment for which it was derived, but also for a second experiment in which the criterion was experimentally manipulated. It accounts for the basic facts of the speed-accuracy tradeoff, not only with respect to the two experiments with different speed requirements, but also with respect to the variation of speed over trials within each experiment. While derived from group data, the theory also describes the performance of individual subjects. The mean and variability of the criterion distribution and the ability to utilize associative inhibition are identified as the major sources of individual differences. Methodological problems involved in the scaling analysis of group data are also discussed.     

Experimenter effects on children's understanding of false drawings and false beliefs

Two experiments were conducted in which a variant of J. McGarrigle and M. Donaldson's (1975) "Naughty Teddy" intervention was applied to children's understanding of false drawings and false beliefs. The results showed that preschool children's understanding of the contents of an out-of-date drawing improved when the drawing was made by a capricious agent ("Naughty Snakey" glove puppet) rather than by the experimenter. The children's performance on a false belief task also improved when the events that set up the false belief were the result of the actions of the glove puppet. The results are discussed in terms of the role of children's sensitivity to the pragmatics of interactions in their development of a theory of mind.     

Redundancy phenomena are affected by response requirements

Results are reported for two go/no-go reaction time (RT) experiments, in which the redundant targets advantage was investigated. These experiments were replications of two earlier choice reaction time (CRT) experiments, in which letter stimuli were used. Important differences between the go/no-go RT experiments and the CRT experiments were obtained. Equal and significant redundancy advantages were obtained whether redundant targets were compared with a single target presented with a noise letter or without noise. In the CRT experiments, the advantage was not obtained in the comparison with a single target presented alone. Noise letters did not slow the RTs to single targets with which they were presented as was the case with CRT. Since the differing results of the two procedures depend on the response requirements, explanation of differing CRT data in terms of perceptual or attentional concepts is probably inappropriate. The presence and absence of response competition in the two situations may be the best interpretation. The results tend to support a conclusion of the parallel processing of two letter stimuli separated spatially by as much as 3 degrees.     

Carers' attributions about positive events in psychosis relate to expressed emotion

Background

Relapse is increased in people with psychosis who live with carers with high expressed emotion (EE). Attributional style has been used to understand EE at a psychological level. Previous studies have investigated carer appraisals for negative events in the patient's life. We therefore aimed to examine spontaneous carer attributions for both negative and positive events. Further, we distinguished between high EE based on critical comments, and that based on emotional-overinvolvement.

Method

Audiotapes of the Camberwell Family Interview (CFI) (N = 70) were rated using the Leeds Attributional Coding System (LACS). Raters were blind to previous ratings of EE.

Results

In our sample, low EE carers made significantly more attributions about positive events, and less about negative events than high EE carers. This is because criticism, but not overinvolvement, was strongly associated with responsibility attributions for negative events, while overinvolvement, but not criticism, was inversely associated with responsibility attributions for positive events.

Conclusion

Carers' attributions for both positive and negative events may be a useful target for improving family interventions in psychosis.     

Face and gaze processing in Prader‐Willi syndrome

A number of developmental disorders of genetic origin show atypical aspects of face processing. However, little is known about face processing in Prader‐Willi syndrome (PWS). PWS is of specific interest because it has two modes of inheritance (paternally derived deletion, DEL; maternal uniparental disomy, UPD) only one of which (UPD) is associated with an increased risk of autistic symptomology. We conducted electrophysiological (ERP) and behavioural measurements of face and eye‐gaze processing in individuals with PWS derived from both modes of inheritance. Our hypothesis that UPD PWS would show a pattern of deficits resembling those seen in autism was only partially confirmed. Although some individuals from both groups showed deficits, as a whole the UPD group (N=8) and the DEL group (N=8) did not differ on behavioural measures of face processing or autistic symptoms. In contrast, the effect of face orientation and gaze direction on the amplitude of the N170 ERP component differed between the two PWS sub‐types. Thus, while the behavioural tests did not discriminate between the UPD and deletion forms of the syndrome, electrophysiological measures of face processing did differentiate the groups.     

Group-directed criticisms and recommendations for change: why newcomers arouse more resistance than old-timers

Three experiments examine the extent to which newcomers are able to influence their groups relative to old-timers. Specifically, how group members respond to criticisms of their group was assessed as a function of the intragroup position of the speaker. When criticizing their workplace (Experiment 1; N = 116), their profession (Experiment 2; N = 106), or an Internet community (Experiment 3; N = 189), newcomers aroused more resistance than old-timers, an effect that was mediated by perceptions of how attached critics were to their group identity. Experiment 3 also showed that newcomers could reduce resistance to their criticisms by distancing themselves from a group of which they were previously members. Theoretical and practical implications of these findings are discussed.     

Bridging the idiographic-nomothetic divide in ratings of self and others on the Big Five

Recent discussions of the idiographic-nomothetic debate were initially reviewed in this paper. Three important issues stemming from this debate were then expounded within the context of Personal Construct Theory and evaluated in an empirical study. Participants were required to rate themselves and people they knew on 25 marker items for the Big Five personality traits and on 12 of their own unique personal constructs. The ratings were analyzed using a number of novel statistical methods, including a simple type of confirmatory factor analysis and an informative graphing procedure. Results indicated that at least half of the statistical information derived from the idiographic, personal construct ratings was unique when compared to ratings on the nomothetic Big Five items. The implications of these methods and results for person-centered and trait conceptualizations of personality were discussed.     

被遗忘的《古兰经》文化

文化是否能够改变文明，就像人类一样，个人或家族经历中曾被抑制的因素会留下印记，甚至会在当今引发混乱？对上述两种情况，我们是否可以提出假设：以往未解决的冲突和“被遗忘的”，即被抑制的渊源会在当下以不满、冲突和激情的方式重现显现出来？