Dissociating uncertainty responses and reinforcement signals in the comparative study of uncertainty monitoring

Although researchers are exploring animals' capacity for monitoring their states of uncertainty, the use of some paradigms allows the criticism that animals map avoidance responses to error-causing stimuli not because of uncertainty monitored but because of feedback signals and stimulus aversion. The authors addressed this criticism with an uncertainty-monitoring task in which participants completed blocks of trials with feedback deferred so that they could not associate reinforcement signals to particular stimuli or stimulus-response pairs. Humans and 1 of 2 monkeys were able to make cognitive, decisional uncertainty responses that were independent of feedback or reinforcement history within a task. This finding unifies the comparative literature on uncertainty monitoring. The dissociation of performance from reinforcement has theoretical implications, and the deferred-feedback technique has many applications.     

Ambivalence toward the body: death, neuroticism, and the flight from physical sensation

Based on terror management theory, the authors suggest that ambivalent reactions to the human body are partially rooted in the association of the physical body with inescapable death and that individuals high in neuroticism are particularly vulnerable to such difficulties. Three experiments demonstrated that priming thoughts about one's death leads individuals high in neuroticism to flee from physical sensations, including pleasurable ones. In response to mortality salience, highly neurotic individuals spent less time submerging their arm in ice-cold water and using an electric foot massager but did not avoid stimulation in nontactile modalities (i.e., listening to music). The discussion highlights the role of existentially motivated self-repression in inhibitions surrounding the body.     

The interactive effects of low self-control and commitment to school on substance abuse among college students

This study examined the combined influence of two predicting factors-low self-control and commitment to schooling-that research has shown have independent effects on substance abuse. In a sample of 598 college students, this study tested the interactive effects of these factors while controlling for other established predictors of binge drinking and drug use. Analysis showed that participants who had both low self-control and low schooling commitment had significantly higher scores on substance abuse than would be expected from the independent influences of the component factors, which suggests that the combined effects of these predictors on substance abuse have a greater influence than their direct influences.     

Source monitoring in a generative task

Following exposure to experimenter-provided examples of space creatures, people tend to conform to the features contained in the examples when creating their own novel space creatures. In three experiments, we manipulated factors known to affect source-monitoring accuracy to determine how these manipulations would influence conformity to experimenter-provided examples. In Experiment 1 we altered people's cognitive agenda by means of the instructions given before the drawing task. In Experiment 2 we examined how time pressure would affect the level of conformity, and in Experiment 3 we manipulated the availability of the creatures during the drawing task by making them available to half the participants. Conformity decreased when extended source-monitoring processes were engaged and increased when these processes were disrupted. The results from the three experiments were consistent with the principles of the source-monitoring framework.     

Underreporting of psychopathology on the MMPI-2: a meta-analytic review

Meta-analytic techniques were applied to studies of the MMPI-2 in which participants given standard instructions were compared with participants instructed or believed to have been underreporting. Traditional and supplementary indices of underreporting yielded a mean effect size of 1.25, suggesting that underreporting respondents differ from those responding honestly by a little more than 1 standard deviation, on the average, on these scales. Analyses of classification accuracy suggested that several scales are moderately effective in detecting underreporting, although accuracy decreases if participants have been coached about validity scales. Base rates of defensive responding in relevant populations are reviewed, and methodological issues, including research designs, coaching, and incremental validity of supplementary underreporting scales, are discussed.     

The hippocampus and memory of verbal and pictorial material

Recognition of words and kaleidoscope pictures showed a double dissociation of left and right hippocampal activity using magnetic source imaging (MSI). MSI has advantages over alternative imaging techniques that measure hemodynamic changes for identifying regional changes in brain activity in real time and on an individual subject basis without the need for image subtraction. In this study, lists of words or kaleidoscope pictures were presented for memorization followed by tests of list items and foils during which brain activity was recorded. There was greater activation in the left than the right hippocampus with abstract nouns (e.g., relief) and greater activation in the right than the left hippocampus with kaleidoscope pictures. This dissociation was evident on a case by case basis. This study demonstrates the specialization of the two medial temporal lobe (MTL) regions, including the hippocampi, for mnemonic processing of verbal and pictorial items that are difficult to encode verbally.     

Smith On Times And Tokens

In this essay I respond to Quentin Smith's chargethat `the date-analysis version ofthe tenseless theory of time cannot give adequateaccounts of the truth conditions ofthe statements made by tensed sentence-tokens'(Smith 1999, 236). His argument isbased on an analysis of certain counterfactualsituations that is at odds with thedate-analysis account of language and hence succeedsonly in begging the questionagainst that theory. To anticipate: his argumentfails if one allows that temporalindexicals such as `now' rigidly designate theirtime of utterance, something thedate-analyst can happily admit whether she adheresto an absolute or relationalmetaphysics of time.     

The feature positive effect in the face of variability: novelty as a feature

Past literature has shown, across various methods and species, that feature positive (FP) tasks (AB-/B+) are learned more easily than are feature negative (FN) tasks (AB-/B+), giving rise to what is known as the feature positive effect (FPE). Experiment 1 was intended to assess the role of expected absence in the FPE through manipulation of the context (constant vs. varied common elements) that was paired with the feature. The results indicate that novel contextual elements (varied common elements) may be salient enough to eliminate the FPE, creating a feature negative effect (FNE). Experiment 2 replicated the FNE. The addition of a testing phase confirmed that participants in the FN task judged novel stimuli to be strong positive predictors whereas participants in the FP task did not, thus producing a novelty FPE. These results are problematic for contemporary associative learning models.     

It's for your own good: benevolent sexism and women's reactions to protectively justified restrictions

Three studies examined women's reactions to ostensibly protective restrictions. In Study 1, only benevolently sexist women accepted a protectively justified (hypothetical) prohibition against driving on a long trip, but only when imposed by a husband (not a coworker). In Study 2, when women's actual romantic partners opposed their participation in a practicum counseling dangerous men, most reacted positively to a personalized protective justification ("I am concerned for your safety"), but only benevolently sexist women reacted positively when no justification was given. In Study 3, only benevolently sexist women accepted an explicitly group-based protective justification ("It is not safe for any woman") for a partner's imagined opposition to an internship that involved interviewing criminals. By fusing benevolence with dominance, protective paternalism can lead women (especially those who are high on benevolent sexism) to accept restrictions.