Determining the number of factors to retain in an exploratory factor analysis using comparison data of known factorial structure

Exploratory factor analysis (EFA) is used routinely in the development and validation of assessment instruments. One of the most significant challenges when one is performing EFA is determining how many factors to retain. Parallel analysis (PA) is an effective stopping rule that compares the eigenvalues of randomly generated data with those for the actual data. PA takes into account sampling error, and at present it is widely considered the best available method. We introduce a variant of PA that goes even further by reproducing the observed correlation matrix rather than generating random data. Comparison data (CD) with known factorial structure are first generated using 1 factor, and then the number of factors is increased until the reproduction of the observed eigenvalues fails to improve significantly. We evaluated the performance of PA, CD with known factorial structure, and 7 other techniques in a simulation study spanning a wide range of challenging data conditions. In terms of accuracy and robustness across data conditions, the CD technique outperformed all other methods, including a nontrivial superiority to PA. We provide program code to implement the CD technique, which requires no more specialized knowledge or skills than performing PA.     

Direction of threat attention bias predicts treatment outcome in anxious children receiving cognitive-behavioural therapy

BackgroundA bias to selectively direct attention to threat stimuli is a cognitive characteristic of anxiety disorders. Recent studies indicate that individual differences in pre-treatment threat attention bias predict treatment outcomes from cognitive-behavioural therapy (CBT) in anxious individuals. However, there have been inconsistent findings regarding whether attention bias towards threat predicts better or poorer treatment outcome.MethodThis longitudinal study examined treatment outcomes in 35 clinically-anxious children following a 10-week, group-based CBT program, as a function of whether children showed a pre-treatment attention bias towards or away from threat stimuli. The effect of CBT on attention bias was also assessed.ResultsBoth groups showed significant improvement after receiving CBT. However, anxious children with a pre-treatment attention bias towards threat showed greater reductions not only in anxiety symptom severity, but also in the likelihood of meeting diagnostic criteria for anxiety disorders at post-treatment assessment, in comparison with anxious children who showed a pre-treatment attention bias away from threat. Children who had a pre-treatment bias away from threat showed a reduction in this bias over the course of CBT.ConclusionsFindings suggest that pre-existing differences in the direction of attention towards versus away from threat could have important implications for the treatment of anxious children.     

Facial affect recognition deficits: A potential contributor to aggression in psychotic illness

The current literature suggests a relationship between psychosis and the likelihood of engaging in aggressive behavior, though the factors involved are unclear. In this paper we use a social information processing framework to consider mediators of aggressive behavior in psychosis, especially facial affect recognition (FAR) deficits. The theoretical underpinnings of aggressive behavior are explored using the General Aggression Model (GAM) and FAR deficits are posited as a possible contributor to increased aggression in psychosis. Current research investigating the relationship between FAR, psychosis, and aggression is critically examined, and the role of potential confounding variables including positive symptoms, psychopathic personality traits, childhood trauma, and substance use briefly explored. In conclusion, we argue that socioemotional processing deficits, such as impaired FAR, are a fruitful area for research aimed at understanding, and hence reducing the risk of violence in psychosis.     

Small and large number discrimination in guppies

Non-verbal numerical behavior in human infants, human adults, and non-human primates appears to be rooted in two distinct mechanisms: a precise system for tracking and comparing small numbers of items simultaneously (up to 3 or 4 items) and an approximate system for estimating numerical magnitude of a group of objects. The most striking evidence that these two mechanisms are distinct comes from the apparent inability of young human infants and non-human primates to compare quantites across the small (<3 or 4)/large (>4) number boundary. We ask whether this distinction is present in lower animal species more distantly related to humans, guppies (Poecilia reticulata). We found that, like human infants and non-human primates, fish succeed at comparisons between large numbers only (5 vs. 10), succeed at comparisons between small numbers only (3 vs. 4), but systematically fail at comparisons that closely span the small/large boundary (3 vs. 5). Furthermore, increasing the distance between the small and large number resulted in successful discriminations (3 vs. 6, 3 vs. 7, and 3 vs. 9). This pattern of successes and failures is similar to those observed in human infants and non-human primates to suggest that the two systems are present and functionally distinct across a wide variety of animal species.     

Spatial working memory for locations specified by vision and audition: Testing the amodality hypothesis

Spatial working memory can maintain representations from vision, hearing, and touch, representations referred to here as spatial images. The present experiment addressed whether spatial images from vision and hearing that are simultaneously present within working memory retain modality-specific tags or are amodal. Observers were presented with short sequences of targets varying in angular direction, with the targets in a given sequence being all auditory, all visual, or a sequential mixture of the two. On two thirds of the trials, one of the locations was repeated, and observers had to respond as quickly as possible when detecting this repetition. Ancillary detection and localization tasks confirmed that the visual and auditory targets were perceptually comparable. Response latencies in the working memory task showed small but reliable costs in performance on trials involving a sequential mixture of auditory and visual targets, as compared with trials of pure vision or pure audition. These deficits were statistically reliable only for trials on which the modalities of the matching location switched from the penultimate to the final target in the sequence, indicating a switching cost. The switching cost for the pair in immediate succession means that the spatial images representing the target locations retain features of the visual or auditory representations from which they were derived. However, there was no reliable evidence of a performance cost for mixed modalities in the matching pair when the second of the two did not immediately follow the first, suggesting that more enduring spatial images in working memory may be amodal.     

Affective,Biological, and Cognitive Predictors of Depressive Symptom Trajectories in Adolescence

Heterogeneity in the longitudinal course of depressive symptoms was examined using latent growth mixture modeling among a community sample of 382 U.S. youth from ages 11 to 18 (52.1 % female). Three latent trajectory classes were identified: Stable Low (51 %; displayed low depressive symptoms at all assessments), Increasing (37 %; reported low depressive symptoms at age 11, but then significantly higher depressive symptoms than the Stable Low class at ages 13, 15, and 18), and Early High (12 %; reported high early depressive symptoms at age 11, followed by symptoms that declined over time yet remained significantly higher than those of the Stable Low class at ages 13, 15, and 18). By age 15, rates of Major Depressive Disorder diagnoses among the Early High (25.0 %) and Increasing (20.4 %) classes were more than twice that observed among the Stable Low class (8.8 %). Affective (negative affectivity), biological (pubertal timing, sex) and cognitive (cognitive style, rumination) factors were examined as predictors of class membership. Results indicated general risk factors for both high-risk trajectories as well as specific risk factors unique to each trajectory. Being female and high infant negative affectivity predicted membership in the Increasing class. Early puberty, high infant negative affectivity for boys, and high rumination for girls predicted membership in the Early High class. Results highlight the importance of examining heterogeneity in depression trajectories in adolescence as well as simultaneously considering risk factors across multiple domains.     

What is specific to music processing? Insights from congenital amusia

Musical abilities are generally regarded as an evolutionary by-product of more important functions, such as those involved in language. However, there is increasing evidence that humans are born with musical predispositions that develop spontaneously into sophisticated knowledge bases and procedures that are unique to music. Recent findings also suggest that the brain is equipped with music-specific neural networks and that these can be selectively compromised by a congenital anomaly. This results in a disorder, congenital amusia, that appears to be limited to the processing of music. Recent evidence points to fine-grained perception of pitch as the root of musical handicap. Hence, musical abilities appear to depend crucially on the fine-tuning of pitch, in much the same way that language abilities rely on fine time resolution.     

A category mistake: why contemporary Australian religious education in Catholic schools may be doomed to failure

Assuming religious education to be the same as other subject areas of a Catholic school’s curriculum by, for example, applying the outcomes based philosophy and language of other subject areas to religious education renders a category mistake. A prominent notion in the work of metaphysical philosopher Gilbert Ryle, a category mistake arises when facts of one kind are presented as if they belong to another. This is significant. When Australian Catholic diocesan syllabus documents treat and describe religious education as being like other subjects comprising the curriculum, a category mistake is made, the effects of which may be damaging for student learning. Following an examination of relevant Church documents to describe its purpose, a brief analysis of contemporary Australian Catholic diocesan religious education syllabi (cases in point) indicates that a series of category mistakes have been made. These findings have significance in informing the development and refinement of theory, policy and practice in religious education.     

What student psychotherapists want from an experiential group

A study of four thirty-week experiential groups, involving two group conductors and forty-one other group members showed that 90 per cent of students' expectations of change were exceeded, indicating increase in interpersonal learning and, over a longer period, emotional change. the culture of the groups was consistently positive and expressive. There was some evidence that conductors had a similar style which corresponded to that predicted by the group analytic method, and that both showed behaviours which were indicators of ‘good quality' therapy. There were substantial correlations between a positive culture and better than expectation outcome at the end of term one, and good psychodynamic practice by the conductors and outcome at the end of the course.