Belief bias and figural bias in syllogistic reasoning

Belief bias is the tendency to be influenced by the believability of the conclusion when attempting to solve a syllogistic reasoning problem. Figural bias is the tendency to be influenced by the order in which the information is presented in the premises when attempting to solve a syllogistic reasoning problem. When studied simultaneously they enable an investigation of whether participants' reasoning on the syllogistic reasoning task is guided by the conclusion (backward reasoning) or the premises (forward reasoning). Experiments 1 and 2 found evidence of belief bias but not figural bias on the syllogistic evaluation task paradigm. Experiments 3 and 4 found evidence of figural bias but not belief bias on the syllogistic production task paradigm. The findings highlight that different task characteristics influence performance dependent upon the nature of task presentation. These findings are discussed in the context of current theories of belief bias in syllogistic reasoning.     

Sorority and Fraternity Membership and Religious Behaviors: Relation to Gender Attitudes

This study was designed to explore gender attitudes and religious behaviors among sorority/fraternity (S/F) and non-S/F undergraduates. Two hundred and seventy-nine participants completed the Gender Attitude Inventory (GAI, a multidimensional gender attitudes instrument), items that assessed religious behaviors (i.e., attendance in a place of worship and frequency of prayer), and a measure of social desirability. Overall, it was found that fraternity members, compared to sorority and non-S/F members, held more stereotypical gender attitudes. Specifically, the results suggest that fraternity members tend to accept stereotypical beliefs about women and male heterosexual violence toward women; endorse casual sex by women; reject women's political leadership; oppose women's rights; and believe in differential work roles. Attendance in a place of worship and prayer were related to greater disapproval of casual sex by women. Non-S/F members who prayed at least weekly reported slightly higher condemnation of homosexuality than S/F members did.     

Pretrauma Neuroticism, Negative Appraisals of Intrusions, and Severity of PTSD Symptoms

Earlier studies found that self-reported posttraumatic stress disorder (PTSD) symptoms are correlated with negative appraisals of symptoms and with neuroticism. It is unclear whether the latter two are associated. Possibly, an overarching trait such as neuroticism mediates the relationship between PTSD symptoms and negative appraisals of symptoms. Data from a previous study (see I. M. Engelhard, M. A. van den Hout, M. Kindt, A. Arntz, & E. Schouten, 2003) were used in the present effort to address these issues. Neuroticism scores were obtained from 1,372 pregnant women. One hundred and twenty-six women experienced a pregnancy loss, and 117 of them were assessed for PTSD symptoms and negative appraisals of symptoms. The 3 variables of interest were all significantly correlated. The data indicate that negative appraisals of symptoms explain and predict PTSD symptoms independently of neuroticism.     

A Web-Based Archive of Norms,Stimuli, and Data

A new public archive of norms, stimuli, data, and source code,www.psychonomic.org/archive, is at the service of researchers and students in experimental psychology. The archive has received contributions from more than 60 researchers. The August and November 2004 issues ofBehavior Research Methods, Instruments, & Computers comprise articles related to the inaugural contents of the archive, which will henceforth accept contributions related to articles published in all Psychonomic Society journals.     

Letter string processing and visual short-term memory

The present study investigated whether expertise with letter string processing influences visual short-term memory capacity. Specifically, we examined whether performance in a change-detection task would vary as a function of stimulus type (letters vs. symbols) and type of display (horizontal, vertical, and circular). Participants were asked to detect a one-character change in a briefly presented character array following a delay of 900?ms. Concurrent articulation was used to limit effects of rehearsal. Type of display significantly affected performance with letters, but not with symbols, with a selective increase in change-detection accuracy for horizontally presented letter arrays compared with vertical and circular arrays. These findings confirm the standard limits of storage in visual short-term memory, but critically reveal a selective advantage for letter arrays over symbol arrays when presented horizontally. Such an advantage is probably due to the utilization of a specialized encoding mechanism built up over years of reading experience.     

Bridging the gap on Facebook: assessing intergroup contact and its effects for intergroup relations

In line with Allport's contact hypothesis, previous research showed that direct intergroup contact can reduce prejudices. However, establishing face-to-face contact is not always feasible. We postulate that Facebook-groups are a setting where direct and observed intergroup contact can develop, reducing prejudices and increasing mutual acceptance. Analyzing the comments of nine Facebook-groups with the destructive and constructive conflict scale, our results indicated that the expression of prejudices decreased and that of mutual acceptance increased over time, both for in- and outgroup members of the Facebook-groups. Only the expression of less prejudices, but not that of more mutual acceptance was predicted by intergroup contact. The influence of group-based motivations on the engagement in intergroup contact is discussed, and the overall findings are integrated in Steele and Brown's process model of media practices.     

Close encounters of the distracting kind: Identifying the cause of visual tracking errors

Why can we track only so many objects? We addressed this question by asking when and how tracking errors emerge. To test the hypothesis that many tracking errors are target/nontarget confusions emerging from close encounters, we compared standard multiple-object tracking trials with trials on which a nontarget turned a random color whenever it approached within 4° of a target. This manipulation significantly improved performance by alleviating the correspondence challenge of a close encounter. Two control experiments showed that color change benefits were not merely due to target recovery. Follow-up experiments demonstrated that color change benefits did not accrue monotonically with distance but, instead, seemed to obey a step function; and an additional experiment demonstrated that, without color changes, the frequency of close encounters predicts tracking performance. Taken together, these experiments suggest that uncertainty about target location imposes the primary constraint on tracking, at times causing errors by leading to confusions between targets and nontargets.     

Severity of childhood attention-deficit hyperactivity disorder--a risk factor for personality disorders in adult life?

Some evidence points to an increased rate of cluster B and C personality disorders (PDs) in adult ADHD patients. In order to assess axis II disorders comprehensively we used the diagnostic instrument of the WHO. In sixty adult out-patients with ADHD according to DSM-IV criteria PDs were assessed with the International PD Examination (IPDE) and severity of childhood ADHD with the Wender-Utah-Rating Scale (WURS). We found at least one PD in 25% of cases. Cluster C PDs were most common (36.6%) followed by Cluster B (23.3%) and A (8.3%). Avoidant (21.7%) and borderline (18.3%) were the most frequent single PD entities. ADHD patients with PD suffered from significantly more severe childhood ADHD compared to those without co-occurring PD. Applying the IPDE we confirmed a high number of PDs among adult ADHD patients. Our findings point to a higher vulnerability for the development of PDs in patients with severe childhood ADHD.