Affective Expectations Influence Neural Responses to Stressful Images in Soldiers

In the present study, we examined how expectations about the affective valence of an event influence immediate neurocognitive responses to the event. Both neutral images and negative images displaying war photos were shown to active duty military personnel undergoing predeployment training. Expectations regarding the affective content of upcoming images were manipulated by means of abstract visual cues that were valid only 75% of the time. Besides providing greater ecological validity, inclusion of invalid cues enabled us to examine separately, effects of the expected and actual valence of the images. Neurocognitive responses within the first second after image presentation were examined using the late positive potential (LPP), a noninvasive measure of brain electrical activity known to index affective processes. Negative images evoked an enhanced LPP relative to neutral images over central-parietal and right anterior electrode sites. Both the central-parietal and anterior LPP were found, likewise, to be modulated by expected valence. Expectation of negative versus neutral images led to an enhanced central-parietal LPP and an attenuated anterior LPP over both hemispheres independent of image valence. These findings are interpreted in terms of the allocation of attention to motivationally salient events, affective interpretation of those events, and induced affective/motivational states. By helping to characterize affective responses to acute stress and the regulation of those responses by psychological context, our study contributes to a basic understanding of how such regulation may become disordered and may aid in the development of targets for therapeutic interventions.     

The Self‐Ambivalence Measure: A psychometric investigation

The purpose of this study was to assess the psychometric properties of the Self‐Ambivalence Measure and its subscales developed by Bhar and Kyrios. The factor structure, reliability, and validity of the measure were examined utilising a non‐clinical sample of 415 participants who completed self‐report measures of aspects of the self. Results indicated that the Self‐Ambivalence Measure exhibited levels of internal consistency and convergent and divergent validity, warranting its use in further research. In contrast to earlier research finding a two‐factor structure, a three‐factor structure was found to best fit the current sample and the factors were labelled Self‐Worth Ambivalence, Moral Ambivalence, and Public Self‐consciousness. This solution separated internal aspects of self‐ambivalence from social aspects which were conceptualised as an aspect of lovability. A discussion of implications is provided.     

Watching for gains and losses: The effects of motivational challenge and threat on attention allocation during a visual search task

This experiment tests predictions based on research and evidence around the biopsychosocial model (BPSM) that people in a challenge state have faster, more gain orientated search patterns than those in a threat state. Participants (n = 44) completed a motivated performance task involving the location of a target appearing in one of two search arrays: one associated with gaining points and the other associated with avoiding the loss of points. Midway through the task, participants received a false feedback prime about their performance invoking either challenge or threat. We found that participants receiving a challenge prime (high performance feedback) spent longer searching the gain array and made fewer fixations on the loss array. Those receiving a threat prime (low performance feedback) made fewer fixations on the gain array. These findings are in line with the BPSM and provide evidence that allocation of attention (measured using eye movement data) is related to challenge and threat.     

Predictive validity of the CognitiveVs. Somatic Anxiety Distinction

The purpose of this study was to test the predictive validity of an instrument, The Cognitive-Somatic Anxiety Questionnaire (CSAQ), which purports to measure separately cognitive and somatic anxiety. Twelve subjects with either predominantly cognitive or somatic anxiety received a treatment that matched their predominant anxiety mode (“matched”), and twelve received a treatment which addressed the secondary anxiety mode (“mismatched”). After five sessions, the “matched” subjects reported significantly fewer anxiety symptoms than the “mismatched” subjects. The results support the predictive validity of the CSAQ, and suggest that anxiety may not be a unidimensional phenomenon. The implications of these results for clinical practice are discussed.     

The Impact of Case Characteristics and Prior Jury Experience on Jury Verdicts1

An archival analysis of records from 206 criminal cases was used to evaluate the impact of personal and situational factors on jury verdicts. In particular, we evaluated whether repeated jury service produced bias in jurors that was sufficient to affect jury decisions. A variety of case characteristics and indices of prior jury experience was examined for their relative impact on trial outcomes. Several of the case characteristics were related to verdicts, but the personal characteristics were not. Although more than half of the juries contained experienced jurors, juror experience had little influence on verdicts in either major or subsidiary analyses. However, there was a slight tendency for small juries with large proportions of experienced jurors to convict. This result is consistent with data from Kentucky; a meta-analysis across the two data sets indicates that it is a reliable finding. The results have implications for the determination of jury size. We suggest that future research examine the possibility that increasing jury size may reduce the influence of an individual's bias by providing a balance of other jurors with no or offsetting biases.     

Effect of distance instructions on size judgments

The proposition that in a reduced-cue setting subjects could use cognitive information about an object's distance to make accurate judgments of its size was tested. An improved paradigm was used to determine the effects of distance instructions per se. This paradigm also allowed independent tests of the effectiveness of cue reduction. The data indicated that cue reduction was successful and that the specific distance tendency governed size judgments when there were no distance instructions. When distance instructions were given, they produced size judgments in precisely the ratio predicted by the size-distance invariance hypothesis. However, there was a large constant error, which reflects a tendency of college students to overestimate the amount of distance signified by a verbal instruction. Hence, cognitive information in the form of verbal distance instructions has precise effects on size judgments, but the latter are not veridical, even in the absence of anchor effects from the specific distance tendency and residual perceptual cues.     

Eliminating selective stimulus control: a comparison of two procedures for teaching mentally retarded children to respond to compound stimuli

Selective stimulus control occurs when behavior fails to come under control of all characteristics of a compound stimulus after discrimination training. Two different assessment procedures, one used in prior research and the other incorporating incorrect stimuli (S - 's) which differed minimally from the correct stimulus (S+), were used to detect stimulus control deficits characteristic of selective stimulus control. The efficacy of two training procedures in eliminating selective stimulus control observed with three trainable mentally retarded children was evaluated in Experiment 1. A training procedure using S - 's that were minimally different from the S+ was designed to reduce the probability that stimulus discriminations could be based on stimulus characteristics other than experimenter-specified characteristics defining the S+. This procedure proved more effective in preventing and eliminating selective stimulus control as measured by both assessment procedures than an alternate discrimination training procedure that failed to impact the more stringent measures of selective stimulus control. Experiment 2 indicated that these improvements in stimulus control were not a function of varying degrees of difficulty between stimulus sets or of a prior history of discrimination training with the less effective training procedure. The need for better assessment procedures to detect selective stimulus control and suggestions for further improvements in discrimination training procedures are discussed.     

The beat goes on: rhythmic modulation of cortical potentials by imagined tapping

A frequency analysis was used to tag cortical activity from imagined rhythmic movements. Participants synchronized overt and imagined taps with brief visual stimuli presented at a constant rate, alternating between left and right index fingers. Brain potentials were recorded from across the scalp and topographic maps made of their power at the alternation frequency between left and right taps. Two prominent power foci occurred in each hemisphere for both overt and imagined taps, one over sensorimotor cortex and the other over posterior parietal cortex, with homologous foci in opposite hemispheres arising from oscillations 180 degrees out of phase. These findings demonstrate temporal isomorphism at a neural level between overt and imagined movements and illustrate a new approach to studying covert actions.     

Is the binding of visual features in working memory resource-demanding?

The episodic buffer component of working memory is assumed to play a role in the binding of features into chunks. A series of experiments compared memory for arrays of colors or shapes with memory for bound combinations of these features. Demanding concurrent verbal tasks were used to investigate the role of general attentional processes, producing load effects that were no greater on memory for feature combinations than for the features themselves. However, the binding condition was significantly less accurate with sequential rather than simultaneous presentation, especially for items earlier in the sequence. The findings are interpreted as evidence of a relatively automatic but fragile visual feature binding mechanism in working memory. Implications for the concept of an episodic buffer are discussed.