Controlled forgetting in the retarded

Three experiments investigated selective rehearsal by retardates in a serial memory task which was an adaptation of Bjork's (1970) paradigm involving instructions to forget a subset of the material presented. Since previous research indicated that retarded children do not selectively rehearse, and since Bjork's paradigm requires the use of a selective rehearsal strategy, it seemed likely that retardates would fail in this task. Experiment 1 showed that retardates could perform this task, and there was substantial evidence for cumulative rehearsal. The possibility of an averaging artifact in the data of Expt 1 was eliminated in Expt 2 by showing evidence of primacy and facilitation due to the forget instruction for individual Ss. Experiment 3 indicated that the facilitation due to the forget instruction was likely due to the effective use of a selective rehearsal strategy. These results contrast with other findings of no rehearsal in retarded children. It is suggested that response biases may be involved in previous studies of rehearsal.     

The sufficient conditions for directed forgetting in normal and educable mentally retarded adolescents

A series of studies investigated the conditions under which normal and educable mentally retarded adolescents (13 to 15 years old) would or would not disregard irrelevant information in memory. A directed forgetting task was used in which the person was required to recall short sequences of picture names. In some sequences there was a cue to forget the first few pictures (irrelevant information) and to remember only the subsequent pictures (relevant information). When normal adolescents were given no explanation of the forget cue, there was interference from the irrelevant information. A minimum explanation of the cue, however, was sufficient to eliminate interference for the normal adolescents. The same minimal explanation was not sufficient for mentally retarded adolescents. It was clear that irrelevant information in memory interfered with the performance of retarded adolescents given only a minimal explanation of the forget cue. These results are important since most naturalistic situations do not involve an elaborate explanation of the importance of disregarding irrelevant information previously stored in memory.     

Attention Bias for Threatening Information in Children Following a Distressing Medical Procedure

Attention bias is common in adults with post‐traumatic stress disorder (PTSD) but is less studied in children. Children (n = 22) who experienced a potentially distressing procedure in an outpatient clinic (removal of K‐wires from orthopaedic fractures) and a group of medically unwell children (illness group; n = 27) were compared with healthy controls (n = 32). Children's baseline level of PTS symptoms were indexed prior to the medical procedure, and again at 1‐week follow‐up. Immediately after the K‐wire removal, children completed a dot probe task using two categories of target words (medical threatening and emotionally threatening). While K‐wire children showed an overall bias away from negative words relative to healthy controls, the illness group did not significantly differ from healthy controls. Attention bias in K‐wire and illness groups was unrelated to later PTS symptoms.     

The effects of threatened social evaluation of the physique on cortisol activity

Social self preservation theory asserts that situations high in social-evaluative threat elicit increases in cortisol, a hormone released by the hypothalamic-pituitary-adrenal axis. Most tests of the theory have examined threats associated with social evaluation of a performance. Two experiments examined the effects of threatened social evaluation of one's physique. In Experiments 1 (n?=?50) and 2 (n?=?40), participants allocated to an experimental (threat) condition had significantly higher post-manipulation cortisol than participants in a control (no threat) condition. In Experiment 1, perceptions of social-evaluative threat were significantly correlated with post-manipulation cortisol levels. These results suggest that the threatened social evaluation of one's body can activate the cortisol response. Women who frequently experience such threats may be at increased risk for a variety of health conditions associated with chronic cortisol exposure.     

Unit Cohesion,Resilience, and Mental Health of Soldiers in Basic Combat Training

Military unit cohesion has been shown to correlate with physical and psychological outcomes. However, little is known about the development of cohesion in the early days of military service during Basic Combat Training (BCT) and how it relates to positive support and the negative stressors of training. The current study assessed the development of unit cohesion across the 10-week BCT period (N = 1,939), and the relation of cohesion to stress, resilience, mental health measures, and BCT outcomes (graduation, passing the Army Physical Fitness Test, and final Basic Rifle Marksmanship scores). The sample was primarily male (62%), under age 25 (88%), and unmarried (88%). All putative mediators showed significant change over time. Unit cohesion increased over time (slope 0.22; p < .001), and these increases were associated with decreases in psychological distress (p < .001), sleep problems (p < .001), and tolerance of BCT stressors (p < .001), as well as increases in resilience (p < .001), confidence managing stress reactions (p < .001), and positive states of mind (p < .001). Unit cohesion was indirectly associated with successful graduation and passing the Army Physical Fitness Test through cohesion-related improvement in psychological distress, resilience, and confidence managing reactions to stress. Sleep problems also mediated BCT graduation. Cohesion effects on the Basic Rifle Marksmanship scores were mediated by psychological distress and tolerance of BCT stressors only. These results suggest that unit cohesion may play a key role in the development of psychological health among new soldiers.     

Psychophysical evidence for an extrastriate contribution to a pattern-selective motion aftereffect

A stationary vertical test grating appears to drift to the left after adaptation to an inducing grating drifting to the right, this being known as the motion aftereffect (MAE). Pattern-specific motion aftereffects (PSMAEs) induced by superimposed pairs of gratings in which the component gratings drift up and down but the observer sees a single coherent plaid drifting to the right have been investigated. Two experiments are reported in which it is demonstrated that the PSMAE is tuned more to the motion of the pattern than to the orientation and direction of motion of the component gratings. However, when subjects adapt to the component gratings in alternation, aftereffect magnitude is dependent upon the individual grating orientations and motion directions. These results can be interpreted in terms of extrastriate contributions to the PSMAE, possibly arising from the middle temporal area, where some cells, unlike those in striate cortex (V1), are tuned to pattern motion rather than to component motion.     

Bodies capture attention when nothing is expected

Functional neuroimaging research has shown that certain classes of visual stimulus selectively activate focal regions of visual cortex. Specifically, cortical areas that generally and selectively respond to faces (Kanwisher, N., McDermott, J., & Chun, M. M. (1997). The fusiform face area: a module in human extrastriate cortex specialized for face perception. Journal of Neuroscience, 17(11), 4302-4311; Puce, A., Allison, T., Asgari, M., Gore, J. C., & McCarthy, G. (1996). Differential sensitivity of human visual cortex to faces, letterstrings, and textures: a functional magnetic resonance imaging study. Journal of Neuroscience, 16(16), 5205-5215.) and to the human body (Downing, P. E., Jiang, Y., Shuman, M., & Kanwisher, N. (2001). A cortical area selective for visual processing of the human body. Science, 293(5539), 2470-2473.) have recently been described using fMRI. A parallel body of research has focused on the ability of faces to "capture" the focus of attention, compared to other kinds of objects (Lavie, N., Ro, T., & Russell, C. (2003). The role of perceptual load in processing distractor faces. Psychological Science, 14(5), 510-515; Ro, T., Russell, C., & Lavie, N. (2001). Changing faces: a detection advantage in the flicker paradigm. Psychological Science, 12(1), 94-99; Vuilleumier, P. (2000). Faces call for attention: evidence from patients with visual extinction. Neuropsychologia, 38(5), 693-700.). The present study uses Mack and Rock's "inattentional blindness" paradigm to investigate whether unexpected, task-irrelevant human body stimuli capture awareness when attention is occupied by a primary task (Mack, A., & Rock, I. (1998). Inattentional blindness. London: MIT Press). Silhouettes and stick figures of human bodies, and silhouettes of hands, were compared to control stimuli including object silhouettes, object stick figures, and scrambled silhouettes of bodies, body parts, and objects. Participants were significantly better able to detect a human figure relative to the control stimuli. These results suggest that the human body, like the face, may be prioritized for attentional selection. More generally, they are consistent with the proposal that the visual system assigns attentional priority to types of stimuli that are also represented in strongly selective cortical regions.     

Social class and cross-border higher education: Mainland chinese students in Hong Kong and Macau

In China’s deepening economic reform, higher education plays a crucial role in social stratification and mobility. External higher education is both a symbol of cultural capital and a means of fulfilling social mobility. This article examines the relationship between students’ socioeconomic backgrounds and the opportunities derived from cross-border higher education, focusing on Mainland Chinese students in Hong Kong and Macau. It shows that students with scholarships come from a range of social backgrounds, but that fee-paying students are only from relatively prosperous families. Higher education in Hong Kong and Macau promotes mobility for some, but preserves social stratification for others. Alors que la réforme économique s’ intensifie en Chine, les études supérieures jouent un rôle crucial dans la stratification et la mobilité sociales. L’séducation supérieure obtenue à l’étranger constitue un symbole de capital culturel ainsi qu’un moyen d’acquérir la mobilité sociale. Cet article étudie, chez un groupe d’étudiants de la Chine continentale à Hong Kong et à Macau, le rapport entre leur milieu socioéconomique et les occasions qui découlent d’une éducation supérieure internationale. Les résultats indiquent que les étudiants ayant reça des bourses proviennent de divers milieux sociaux, mais que ceux qui ne sont pas boursiers viennent exclusivement de families relativement aisées. À Hong Kong et à Macau, l’éducation supérieure facilite la mobilité pour certains; pour d’autres, elle maintient la stratification sociale.