Dissociation between the cognitive process and the phenomenological experience of TOT: effect of the anxiolytic drug lorazepam on TOT states

TOT states may be viewed as a temporary and reversible microamnesia. We investigated the effects of lorazepam on TOT states in response to general knowledge questions. The lorazepam participants produced more commission errors and more TOTs following commission errors than the placebo participants (although the rates did not change). The resolution of the TOTs was unimpaired by the drug. Neither feeling-of-knowing accuracy nor recognition were affected by lorazepam. The higher level of incorrect recalls produced by lorazepam participants may be due to the fact that they were more frequently temporarily unable to access a known item. For some of these items, the awareness of the retrieval failure resulted in a commission TOT (phenonemological TOT after a commission error). The resolution of the TOT conflict is discussed in the light of the anxiolytic and anticonflict effects of lorazepam. The data are discussed in terms of contemporary theories of TOTs and the effects that benzodiazepines have on semantic memory.     

Synapse specificity of long-term potentiation breaks down with aging

Memory shows age-related decline. According to the current prevailing theoretical model, encoding of memories relies on modifications in the strength of the synapses connecting the different cells within a neuronal network. The selective increases in synaptic weight are thought to be biologically implemented by long-term potentiation (LTP). Here, we report that tetanic stimulation of afferent fibers in slices from 12-mo-old mice triggers an LTP not restricted to the activated synapses. This phenomenon, which can be anticipated to hinder memory encoding, is suppressed by blocking either L-type Ca(++) channels or Ca(++)-induced Ca(++) release, both well known to become disregulated with aging.     

Police officers' views of effective interview tactics with suspects: The effects of weight of case evidence and discomfort with ambiguity

This study examined the effects of case‐specific facts and individual discomfort with ambiguity (DA) on investigators' beliefs concerning effective interviewing tactics for suspects. Violent crime investigators (n = 30) responded to a questionnaire including the Need for Closure Scale (NFCS) and ratings of the importance of 39 interrogation tactics in two hypothetical interrogations with a homicide suspect, where the evidence consisted of either technical evidence or soft information. Twenty tactics were analysed with a multidimensional scaling procedure which confirmed two discrete interviewing themes: humane and dominant. More tactics, both dominant and humane, were rated as important if the evidence was soft compared with technical. In the soft evidence condition, investigators who were high on DA rated both types of tactics as more important than did low‐DA investigators. In the technical evidence condition, no such difference emerged. Copyright © 2008 John Wiley & Sons, Ltd.     

Likelihood ratio decisions in memory: Three implied regularities

We analyze four general signal detection models for recognition memory that differ in their distributional assumptions. Our analyses show that a basic assumption of signal detection theory, the likelihood ratio decision axis, implies three regularities in recognition memory: (1) the mirror effect, (2) the variance effect, and (3) the z-ROC length effect. For each model, we present the equations that produce the three regularities and show, in computed examples, how they do so. We then show that the regularities appear in data from a range of recognition studies. The analyses and data in our study support the following generalization: Individuals make efficient recognition decisions on the basis of likelihood ratios.     

Test anxiety,evaluative stress,and susceptibility to distraction from threat

Examinations are perhaps one of the main methods of assessment in education. Unfortunately, there are some individuals who are so fearful of such events that performance is impaired. Test anxiety is believed to be the trait that predisposes individuals to react negatively to examinations and tests. One way in which it is believed that test anxiety affects performance is by increasing susceptibility to distraction from task‐irrelevant material. However, few studies have directly investigated this impairment. An experiment was therefore conducted to investigate susceptibility to distraction in high and low test‐anxious students. The task used was based on one developed by Mathews, May, Mogg and Eysenck (1990), which distinguishes between focused attention and selective search. In order to determine whether a specific susceptibility to distraction exists, the distractors were varied in terms of valence and relevance to examinations. Since test anxiety is a situation‐specific trait, an evaluation‐related stressor was used to trigger test‐anxious reactions. A specific susceptibility to distraction from threat was found amongst high test‐anxious participants who received the evaluation‐related stressor. However, this effect was only found when participants were using focused attention. This suggests that the disturbed performance often found to be associated with test anxiety might be due to an inability to ignore threatening material when attempting to focus attentional resources. These results are discussed in light of current theories of test anxiety and implications for educational practice. Copyright © 2001 John Wiley & Sons, Ltd.