Time course of selective attention in clinically depressed young adults: an eye tracking study

Depressed individuals display biased attention for emotional information when stimuli are presented for relatively “long” (e.g., 1 s) durations. The current study examined whether attentional biases are sustained over a much longer period. Specifically, clinically depressed and never depressed young adults simultaneously viewed images from four emotion categories (sad, threat, positive, neutral) for 30 s while line of visual gaze was assessed. Depressed individuals spent significantly more time viewing dysphoric images and less time viewing positive images than their never depressed counterparts. Time course analyses indicated that these biases were maintained over the course of the trial. Results suggest that depressed participants' attentional biases for dysphoric information are sustained for relatively long periods even when other emotional stimuli are present. Mood congruent information-processing biases appear to be a robust feature of depression and may have an important role in the maintenance of the disorder.     

Which training method works best? A randomized controlled trial comparing three methods of training clinicians in dialectical behavior therapy skills

This study evaluated the efficacy of three methods of training community mental health providers (N = 150) in Dialectical Behavior Therapy skills, including a written treatment manual; an interactive, multimedia online training (OLT); and a two-day instructor-led training workshop (ILT). A hybrid design was utilized that incorporated aspects of efficacy and effectiveness trials. Assessments were completed at baseline, post-training, and 30- and 90-days following training. The results indicate that learner satisfaction with the training was highest in OLT and ILT, and both resulted in significantly higher satisfaction ratings than the manual. OLT outperformed ILT and the manual in increasing knowledge of the treatment, whereas ILT and the manual did not differ. All three training methods resulted in comparable increases in clinicians' ability to apply course content in clinical simulations. Overall, the results provide strong support for the efficacy of technology-based OLT methods in disseminating knowledge of empirically supported treatments to community mental health providers, suggesting that OLT may be a high-quality, easily accessible, and affordable addition to traditional training methods.     

Desktop flight simulators: Simulation fidelity and pilot performance

Improvements in the computing power and visual resolution of modern desktop computing systems, as well as advances in software technology for displaying high-speed animations, have encouraged the development of relatively sophisticated real-time flight simulators for the PC and Macintosh. We review some of the factors that determine how well such programs capture the actual experience of flight. The most significant factor limiting the quality of performance in flying a simulated aircraft is the “frame rate” problem: at low altitudes and in highly detailed visual environments, as in approaching a runway threshold during landing, the computational demands of the animation may necessitate a reduction in the number of frames displayed per second on the screen. The delayed sensory feedback that results proves to be very detrimental to sustaining smooth control of the aircraft, especially during the flare to touchdown where such control is needed most. This finding parallels the well-known effects of delayed auditory feedback (Lee, 1950) and delayed visual feedback (Smith, 1962).     

Cardiac and neuroendocrine responses to exposure therapy in height phobics: desynchrony within the 'physiological response system'

Subjective, behavioral, cardiovascular and neuroendocrine responses were intensively monitored in two height phobics over a full course of exposure therapy and at follow-up. Both subjects showed rising cortisol responses and stable, non-extinguishing norepinephrine responses to height exposure over the course of treatment, while improvement occurred in subjective and behavioral response systems. They had differing heart rate responses. Despite desynchrony amongst anxiety response systems and within the physiological 'system' at treatment conclusion, both subjects had successful outcomes which were preserved at follow-up. Implications for the measurement of the 'physiological response system' in behavioral research are discussed.     

A note on the Neyman-Johnson technique

A statistical problem which frequently arises in educational and psychological experimentation is that of testing the significance of the difference of the mean scores of two groups on some criterion variable, where the differential effects of one or more variables which are correlated with the criterion must be statistically eliminated. The usual analytical technique for this type of problem is the analysis of covariance (9). The Neyman-Johnson technique (7) provides another, and substantially different, approach. A computational procedure is suggested here which utilizes the advantages of both techniques without an undue increase in computational labor. In addition, the Neyman-Johnson technique is generalized to the case ofn predictor variables. Its application has heretofore been limited to a maximum of three predictor variables.This paper was written while the author was a Psychometric Fellow of the Educational Testing Service, Princeton, New Jersey.     

The influence of sentential position on noun phrase structure priming

This article explores the interaction between global sentence context and local syntactic decision making. Specifically, four noun phrase (NP) structural priming experiments investigated whether the position of an NP within a sentence increased speakers' tendency to repeat primed structure. We crossed the position of the NP with the structure of the NP, such that NPs could be sentence initial or final in prime sentences. We further manipulated whether the to-be-modified target NP was sentence initial or final. Structural persistence effects were consistently observed, but there was no influence of parallel position. Rather, sentence-initial NP primes had a stronger influence on subsequent syntactic decisions than sentence-final primes, suggesting a primacy effect. Sentence-initial target NPs contributed to this primacy effect, while sentence-final target NPs did not. We argue that this primacy effect arises as the result of greater processing demands and resources for early than for late sentence constituents as well as deeper encoding and more focused attention when processing the beginnings of sentences.     

When bees hamper the production of honey: lexical interference from associates in speech production

In this article, the authors explore semantic context effects in speaking. In particular, the authors investigate a marked discrepancy between categorically and associatively induced effects; only categorical relationships have been reported to cause interference in object naming. In Experiments 1 and 2, a variant of the semantic blocking paradigm was used to induce two different types of semantic context effects. Pictures were either named in the context of categorically related objects (e.g., animals: bee, cow, fish) or in the context of associatively related objects from different semantic categories (e.g., apiary: bee, honey, bee keeper). Semantic interference effects were observed in both conditions, relative to an unrelated context. Experiment 3 replicated the classic effects of categorical interference and associative facilitation in a picture-word interference paradigm with the material used in Experiment 2. These findings suggest that associates are active lexical competitors and that the microstructure of lexicalization is highly flexible and adjustable to the semantic context in which the utterance takes place.     

Neural markers of categorization in 6-month-old infants

Little is known of the neural processes that underlie concept-formation abilities in human infants. We investigated category-learning processes in infants both by using a common behavioral measure and by recording the brain's electrical activity (event-related potentials, or ERPs). ERPs were recorded while 6-month-olds viewed cat images during training, followed by novel cat images interspersed with novel dog images during test. The data indicate that distinct neural signals correspond with learning of a category presented during familiarization, preferential responding to a novel category, and representation of category exemplars at multiple levels of inclusiveness. The results suggest that fundamental components of the neural architecture supporting object categorization are functional within the first half-year of postnatal life, before infants acquire language and young children engage in formal learning of semantic categories. The findings are discussed in terms of their implications for models of category learning and development.