How Cognitive Resources Alter our Perception of the Past: Ego Depletion Enhances the Susceptibility to Suggestion

Studies show that engaging in self‐control results in deteriorated performance on subsequent tasks. In legal settings, witnesses and/or suspects are probably involved in self‐control (e.g. controlling their emotions). The current study tested whether such involvement in self‐control would lead to increased suggestibility levels. We found direct evidence for this. Forty‐four participants were randomly divided into a high level of depletion condition (regulation of attention) or a low level of depletion condition (no regulation of attention). Also, they were presented with a suggestibility measure (Gudjonsson Suggestibility Scale). We showed that depleted participants were significantly more suggestible than non‐depleted participants. Our findings are relevant in situations in which suggestive practices may take place. Copyright © 2011 John Wiley & Sons, Ltd.     

Growth points in research on memory and hippocampus.

We present an overview of two of our on-going projects relating processes in the hippocampus to memory. We are trying to understand why retrograde amnesia occurs after damage to the hippocampus. Our experiments establish the generality of several new retrograde amnesia phenomena that are at odds with the consensus view of the role of the hippocampus in memory. We show in many memory tasks that complete damage to the hippocampus produces retrograde amnesia that is equivalent for recent and remote memories. Retrograde amnesia affects a much wider range of memory tasks than anterograde amnesia. Normal hippocampal processes can interfere with retention of a long-term memory stored outside the hippocampus. We conclude that the hippocampus competes with nonhippocampal systems during memory encoding and retrieval. Finally, we outline a project to understand and manipulate adult hippocampal neurogenesis in order to repair damaged hippocampal circuitry to recover lost cognitive functions.     

Assessing the Need for Alcohol Abuse Programs for African-American College Students

The authors compare Black and White college student alcohol and other drug use. Significant differences were noted showing alcohol abuse to be less of a problem for Black students.     

Overcoming ego depletion: the influence of exemplar priming on self‐control performance

Self‐regulation research suggested that active self‐control depends on a limited resource. Therefore the capacity for self‐control is lower among people who already exercised control, a phenomenon labelled as ego depletion. This experiment examines whether priming of a persistent person exemplar may help to overcome ego depletion. Half of the participants engaged in a demanding self‐control task (solving extremely difficult labyrinths) whereas the other half took part in a task that demanded little self‐control (solving easy labyrinths). Then, half of the participants received a person exemplar prime related to persistence; the other half received a neutral prime. Finally, participants' persistence on a subsequent self‐control task (squeezing a handgrip) was measured. The effect of a person exemplar prime on a subsequent self‐control task depended on initial self‐control demands. Participants who exercised high initial self‐control and were then presented with a persistent exemplar prime showed assimilation. Their handgrip persistence was higher than the persistence of participants who received a neutral prime. Under conditions of low initial self‐control the opposite pattern was found. A persistent person prime resulted in contrast and resulted in lower handgrip performance as compared to those who received a neutral prime. Copyright © 2006 John Wiley & Sons, Ltd.     

The ADP-IV questionnaire: differential validity and concordance with the semi-structured interview

The Assessment of DSM-IV Personality Disorders questionnaire (ADP-IV) is a self-report measure of the DSM-IV Axis II personality disorders (PDs). The ADP-IV assesses for each DSM-IV criterion its typicality as well as the accompanying distress and impairment. This study investigates two important aspects of the construct validity of the ADP-IV: (a) the differential validity (i.e., the ability to differentiate between a sample of the general Flemish population ( n = 659) and a sample of psychiatric inpatients ( n = 487) with a high prevalence of clinical PD diagnoses, and patients with and without a PD in the psychiatric sample; (b) the convergent validity with the SCID-II semi-structured interview in a population of psychiatric inpatients ( n = 59). The results indicate a good differential validity: the dimensional scales and the categorical measures discriminated well between both groups and between patients with and without a PD diagnosis in the psychiatric sample. Concerning the concordance with the SCID-II, a decent level of agreement is exemplified by a correlation of.67 between the dimensional total scores of both instruments and by kappa coefficients for an "any" Axis II diagnosis at the.50 level. In conclusion, the results indicate that the ADP-IV is an efficient method for assessing PD in dimensional and categorical ways.