The effects of experimentally induced stress on false recognition.

The fallibility of memory has become an issue of considerable practical and theoretical importance. Here we studied the impact of experimentally induced stress on the ability of human participants to accurately recognise words presented on a list. We found that stress selectively disrupted participants' ability to distinguish words that were presented for study from critical lure words that were semantically related, but not presented for study. This finding indicates that stress, possibly through its impact on the hippocampus and prefrontal cortex, can potentiate false memories.     

The effects of screening and task partitioning upon evaluations of decision options

Seven experiments examined how information used to screen options is used subsequently in evaluating the survivors before a choice of the best survivor is made and showed the following. (1) In general, information receiver early in the task had a smaller impact upon pre-choice evaluations of options than information received later, whether or not screening had taken place. (2) However, early information had virtually no impact upon pre-choice evaluations when various events partitioned the task into two distinct parts. This was called the ‘task-partitioning effect’. This effect was, however, labile and could be eliminated by repeating the early information at the time that the pre-choice evaluations were made. (3) In contrast, when the partitioning event consisted specifically of screening out unattractive options, early information had virtually no impact on evaluations and its repetition did not increase its use. This was called the ‘screening effect’. This effect was observed even when someone other than the subject carried out the screening.     

The effects of expectations upon task performance as moderated by levels of self-esteem

The study investigated the effects of expectations upon task performance in a simulated work environment. In a 2 × 2 factorial design, individuals of high and low self-esteem responded to either a favorable or unfavorable expectation. It was found that only high self-esteem individuals differed significantly in their response to the expectation manipulation. The results were discussed relative to self-consistency formulations and implications for organizational behavior were suggested.     

The influence of theological attitudes upon evangelism

Pastoral Psychology -     

The dynamics of experimentally induced criterion shifts

Investigations of decision making have typically assumed stationarity, even though commonly observed "context effects" are dynamic by definition. Mirror effects are an important class of context effects that can be explained by changes in participants' decision criteria. When easy and difficult conditions are blocked alternately and a mirror effect is observed, participants must repeatedly change their decision criteria. The authors investigated the time course of these criterion changes and observed the buildup of mirror effects on a trial-by-trial basis. The data are consistent with slow, systematic changes in decision criteria that lag behind stimulus changes. The length of this lag is considerable: analysis of a simple dynamic signal-detection model suggests participants take an average of around 14 trials to adjust to new decision environments. This trial-level measurement of experimentally induced changes has implications for traditional blockwise analyses of data and for models of decision making.     

The temporal stability of the effects induced by the cued reaction time task

The temporal stability of the effects induced by the Cued Reaction Time Task (CRTT) on the orienting of attention was assessed across four weekly sessions. Benefits, costs, and validity effects were computed for each session, and the correlation coefficients between each session were calculated (interindividual stability index). Intraindividual stability indices, the percentage of individuals showing both costs and benefits or the validity effect, were also calculated. The results (based on 41 participants) show a low stability for the effects in which the neutral trials were involved (benefits and costs) but an acceptable reliability for the validity effect, especially when evaluated using the intraindividual index. To maximize the reliability of the data collected using the CRTT, the validity effect seems to be a better probe of spatial orienting of attention.     

Cognate effects in sentence context depend on word class,L2 proficiency,and task

Length effects in the lexical decision latencies of children might indicate that children rely on sublexical processing and essentially approach the task as a naming task. We examined this possibility by means of the effects of neighbourhood size and articulatory suppression on lexical decision performance. Sixty-six beginning and 62 advanced readers performed a lexical decision task in a standard, articulatory suppression, or tapping condition. We found length effects on words and nonwords in the children's lexical decisions. However, the effects of neighbourhood size were similar to those reported for adult lexical decisions, rather than the effects previously found in children's naming. In addition, no effect was found of articulatory suppression. Both findings suggest that, despite clear length effects, children do not adopt a naming task approach but, like adults, base lexical decisions mainly on a lexical search. These results pose a challenge for several computational models of reading.     

The effects of age and task context on Stroop task performance

In this study, we investigated the impact of age and task context on Stroop task performance, using error scores, response latencies, and process dissociation estimates (e.g., Lindsay & Jacoby, 1994). Across three experiments, the findings showed that although older adults were able to evaluate Stroop task demands and modify their representations of task context in response to this knowledge, they were less able to maintain and update these representations on a trial-by-trial basis in tasks with high stimulus uncertainty or ambiguity. Moreover, although there was no age-related decline in the ability to modulate print color information, older adults were consistently less able to control the activation of conflicting word information. Together, these findings suggest that whereas age differences in the Stroop task may be magnified under conditions that promote transient failures to maintain task context, the primary source of these differences seems to be a more enduring decline in the efficiency of processes that are responsible for suppressing the activation of irrelevant lexical information.