Interference in the perceived segregation of equal-luminance element-arrangement texture patterns

Perceived segregation in element-arrangement patterns composed of squares of equal size and luminance, but of two different hues, was investigated in two experiments. Element-arrangement patterns consist of two types of elements, arranged in alternating vertical stripes in the top and bottom regions and in a checkerboard pattern in the center region. Perceived segregation of the striped and checkerboard regions decreased with increasing luminance of the interspaces between the squares, a high-luminance surround, and the increased spacing of the squares. When the luminance of the horizontal interspaces was increased, the decrease in perceived segregation was greater than that when the luminance of the vertical interspaces was increased. Two explanations of the interference of the interspace luminance are discussed. One explanation is in terms of inhibitory interactions among cortical filters tuned to spatial frequency and orientation. A second explanation is in terms of interference with preattentive grouping processes.     

The structure of distress following trauma: posttraumatic stress disorder, major depressive disorder, and generalized anxiety disorder

The current report used confirmatory factor analysis to examine the latent structures of both key features and associated symptoms of three disorders that commonly develop following a traumatic event: posttraumatic stress disorder (PTSD), major depressive disorder (MDD), and generalized anxiety disorder (GAD). Participants were 228 motor-vehicle accident survivors who sought treatment for emotional difficulties. PTSD, MDD, and GAD were assessed with a combination of self-report and interview-based measures. The results of construct level analyses suggested that PTSD, MDD, and GAD are distinguishable but highly correlated disorders following a traumatic event. Symptom level analyses supported a model where the Reexperiencing, Avoidance, and Hypervigilance factors were subsumed under the PTSD construct. However, in this model the Dysphoria factor was a higher order construct correlated with the PTSD, MDD, and GAD factors, suggesting that the Dysphoria cluster may not be unique to PTSD. Diagnostic and theoretical implications of these results are discussed.     

Implicit learning for probable changes in a visual change detection task

Previous research demonstrates that implicitly learned probability information can guide visual attention. We examined whether the probability of an object changing can be implicitly learned and then used to improve change detection performance. In a series of six experiments, participants completed 120–130 training change detection trials. In four of the experiments the object that changed color was the same shape (trained shape) on every trial. Participants were not explicitly aware of this change probability manipulation and change detection performance was not improved for the trained shape versus untrained shapes. In two of the experiments, the object that changed color was always in the same general location (trained location). Although participants were not explicitly aware of the change probability, implicit knowledge of it did improve change detection performance in the trained location. These results indicate that improved change detection performance through implicitly learned change probability occurs for location but not shape.     

Common and Specific Dimensions of Self-Reported Anxiety and Depression in Adolescent Outpatients

To investigate the common and specific dimensions of anxiety and depression in adolescents, the Beck Anxiety Inventory (BAI; Beck, A. T., & Steer, R. A. Manual for the Beck Anxiety Inventory. San Antonio, TX: Psychological Corporation 1993a) and Beck Depression Inventory-II (BDI-II; Beck, A. T., Steer, R. A., & Brown, G. K. Manual for Beck Depression Inventory (2nd Ed.). San Antonio, TX: Psychological Corporation 1996) were administered to 840 adolescent (13–17 years old) outpatients who were diagnosed with various types of psychiatric disorders. A Schmid-Leiman transformation was used with the iterated-principal-factor pattern matrix of the BAI and the BDI-II loadings. The amounts of orthogonalized common variance that were explained by the one second-order (56%), one first-order depression (22%), and two first-order anxiety (22%) dimensions were comparable to those previously reported for adult psychiatric outpatients. The results were discussed as supporting the construct of negative affectivity that is proposed in L. A. Clark and Watson’s (1991) tripartite model of anxiety and depression.

Directionality and temporal factors in conditional reasoning

An experiment is reported which tests psycholinguistic hypotheses about conditional rules of the form ‘If p then q’ (IT) and ‘p only if q’ (OI). It is postulated that each rule has a ‘directionality’ determined by linguistic usage which is ‘forwards’ for IT rules and ‘backwards’ for OI rules. It is further suggested that where temporal relations exist between the events denoted by p and q, the rules will be understood and processed more rapidly if the directionality of the rule is congruent with the temporal order. The results supported these hypotheses and provide a useful replication and extension of previous work.     

Manual Skills and the Measurement of Handedness

This is a brief comment questioning Pellegrini's finding of marked correlations between the astrological sun sign of birth and the Femininity scale of the California Psychological Inventory.