Object continuity and the transsaccadic representation of form

Transsaccadic object file representations were investigated in three experiments. Subjects moved their eyes from a central fixation cross to a location between two peripheral objects. During the saccade, this preview display was replaced with a target display containing a single object to be named. On trials on which the target identity matched one of the preview objects, its orientation either matched or did not match the previewed orientation. The results of Experiments 1 and 2 revealed that orientation changes disrupt perceptual continuity for objects located near fixation, but not for objects located further from fixation. The results of Experiment 3 confirmed that orientation changes do not disrupt continuity for distant objects, while showing that subjects nevertheless maintain an object-specific representation of the orientation of such objects. Together, the results suggest that object files represent orientation but that whether or not orientation plays a role in the processes that determine continuity depends on the quality of the perceptual representation.     

Is schizotypy taxonic? Response to

Beauchaine, Lenzenweger, and Waller (2008) criticize our taxometric study of schizotypy (Rawlings, Williams, Haslam, & Claridge, in press) on a variety of methodological and philosophical grounds. We argue that their critique selectively applies more stringent standards to our work than to studies supporting their view that schizotypy is taxonic (i.e., categorical). Many of their criticisms apply at least equally to existing studies that offer support for a schizotypy taxon, and these studies are vulnerable to biases favouring taxonic conclusions that were controlled for in our study. Contrary to their criticisms, we did not claim to have disconfirmed previous taxonic findings about schizotypy, and our findings positively support dimensional models of schizotypy rather than merely being null results. Similarly, our findings are not artefacts of the sampling or measurement decisions that they question. Even well-replicated taxometric findings are not immune to empirical challenge, and evaluation of such challenges must be even-handed.     

Suicidal ideation in college students varies across semesters: the mediating role of belongingness

The interpersonal-psychological theory of suicidal behavior (Joiner, 2005) proposes that the need to belong is fundamental; when met it can prevent suicide and when thwarted it can substantially increase the risk for suicide. We investigate one source of group-wide variation in belongingness among college students--changes in the social composition of college campuses across academic semesters--as an explanation for variation in suicidal ideation across the academic year. Our results indicate that in a sample of college students at a large southern state university (n = 309), suicidal ideation varied across academic semesters, with highest levels in summer compared to both spring and fall. Differences in suicidal ideation between summer and spring were, in large part, accounted for by belongingness. Theoretical, as well as practical, implications are discussed regarding mechanisms for seasonal variation in suicidal ideation.     

Interparental conflict, negative parenting, and children's adjustment: bridging links between parents' depression and children's psychological distress

Pathways linking parental depressive symptoms, adult relationship insecurity, interparental conflict, negative parenting, and children's psychological adjustment (internalizing symptoms and externalizing problems) were assessed using a 3-wave longitudinal research design. Two-parent families (N = 352) with 11- to 13-year-old children (179 boys, 173 girls) participated in the study. Maternal and paternal depressive symptoms were associated with insecurity in adult close relationships assessed 12 months later, which was concurrently related to heightened levels of interparental conflict. Controlling for children's initial symptom levels, interparental conflict was related to child appraisals of father and mother rejection assessed an additional 12 months later, which were related to children's internalizing symptoms and externalizing problems, respectively. Results are discussed with regard to the implications for understanding the complex interplay between adult depressive symptoms, attributions in close adult relationships, interparental conflict, negative parenting, and children's psychological adjustment.     

Perfectionism,Distress, and Irrational Beliefs in High School Students: Analyses with an Abbreviated Survey of Personal Beliefs for Adolescents

The current study examined the associations between dimensions of perfectionism and irrational beliefs in an adolescent sample. In addition, we tested the association between psychological distress and irrational beliefs in adolescents and we evaluated the feasibility of creating a modified version of the Survey of Personal Beliefs for use with adolescents. A sample of 250 adolescents (108 males, 142 females) completed the Child-Adolescent Perfectionism Scale, the Survey of Personal Beliefs, and the CES-D Depression Scale. Initial psychometric analyses yielded an abbreviated 30-item Survey of Personal Beliefs with adequate internal consistency for four of the five subscales. Our results showed that self-oriented perfectionism was associated significantly with all five irrational belief subscales, while the associations between socially prescribed perfectionism and irrational belief subscales were much smaller in magnitude. Self-oriented perfectionism, socially prescribed perfectionism, and irrational beliefs were all associated significantly with elevated distress among adolescents, and irrational beliefs predicted unique variance in distress, over and above the variance attributable to the trait perfectionism dimensions. The findings confirmed the association between perfectionism and irrational beliefs and their respective roles in psychological distress among adolescents.     

Purpose in Life, Satisfaction with Life, and Suicide Ideation in a Clinical Sample

This study examined the role of purpose in life and satisfaction with life in protecting against suicide ideation in a clinical psychiatric sample. Forty-nine psychiatric patients completed self-report measures of suicide ideation, purpose in life, satisfaction with life, neuroticism, depression, and social hopelessness. Zero-order correlations indicated significant associations between suicide ideation and the various predictors, in the hypothesized directions. Regression analyses illustrated that purpose in life and satisfaction with life accounted for significant additional variability in suicide ideation scores above and beyond that accounted for by the negative psychological factors alone. Purpose in life also mediated the relation between satisfaction with life and suicide ideation and moderated the relation between depression and suicide ideation. These findings demonstrate the potential value of attending to both resilience and pathology when building predictive models of suicide ideation and of attending to key existential themes when assessing and treating suicidal individuals.     

Factor structure of the Wide Range Assessment of Memory and Learning (WRAML) in children with insulin dependent diabetes mellitus (IDDM).

Maximum likelihood confirmatory factor analysis was performed with the Wide Range Assessment of Memory and Learning (WRAML) for a clinical sample of 246 children with insulin-dependent diabetes mellitus (IDDM). Consistent with previous literature examining the factor structure of the WRAML, findings supported the validity of a three-factor model including Verbal Memory, Visual Memory, and Attention/Concentration (AC) factors for this clinical sample. However, in contrast to previous factor analytic research, results also supported the validity of an alternative two-factor model consisting of a combined modality Memory/Learning (ML) factor and an AC factor. While the results suggest that the three-factor solution may provide an adequate characterization of memory and learning in the majority of this sample of children with IDDM, it appears that certain groups of children with IDDM, particularly those children with early disease onset and those who experience hypoglycemic seizures, may exhibit a specific profile of differences that may result in a lack of differentiation between the verbal and visual modalities.     

Dimensionality and Validity of a Structured Telephone Reference Check Procedure

A structured telephone reference check (STRC) was developed to assess three job-relevant personality/interpersonal dimensions (Conscientiousness, Agreeableness, customer focus) for a family of entry-level, customer-contact jobs within a service organization. The procedure was designed to be brief (a 10–15 minute telephone call with each referee) and easy to administer by untrained recruitment staff. Confirmatory factor analyses on referee ratings for 223 applicants indicated that referees were able to adequately discriminate between dimensions of applicants' past performance. A predictive, criterion-related validation study on those applicants who were hired demonstrated that the STRC predicted supervisory ratings of job performance (   r = .25, p < .01,  uncorrected; .36 corrected for range restriction and criterion unreliability). No evidence was found that referees with shorter working relationships with applicants provided less valid ratings.     

Remarks on the Geometry of Visibles

I offer an explication of Reid's claim (discussed recently by Yaffe and others) that the geometry of the visual field is spherical geometry. I show that the sphere is the only surface whose geometry coincides, in a certain strong sense, with the geometry of visibles.