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971.
Gerald M. Long Barbara Sakitt 《Quarterly journal of experimental psychology (2006)》1980,32(2):269-285
Observers' accuracy in detecting a narrow spatial gap between two brief, luminous rectangles presented successively was determined within a two-alternative, forced-choice procedure. This successive-field task requires iconic memory, because the information (rectangle position) in the two presentations must be combined for successful gap detection. On this task, the effect of varying the duration of the first rectangle was systematically investigated over several target luminance levels and for several ISI conditions between rectangles. At the long ISI conditions (100 and 300 ms), the effects of increasing stimulus duration was to improve performance. However, at the brief ISI condition (20 ms), increasing stimulus duration initially depressed task performance. It was found that, with practice, this initial performance drop largely disappeared, and the beneficial influence of increasing target duration was again obtained. These results are discussed in terms of (a) a proposed retinal locus for the iconic memory involved and (b), at a more general level, the potentially distracting role of changing stimulus dimensions on a task employing transient stimuli as in the present study. 相似文献
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975.
Disability, Connectivity and Transgressing the Autonomous Body 总被引:1,自引:0,他引:1
Gibson BE 《The Journal of medical humanities》2006,27(3):187-196
This paper explores the interconnectedness of persons with disabilities, technologies and the environment by problematizing Western notions of the independent, autonomous subject. Drawing from Deleuze and Guattari's reconfiguration of the static subject as active becoming, prevailing discourses valorizing independence are critiqued as contributing to the marginalization of bodies marked as disabled. Three examples of disability "dependencies"-man-dog, man-machine, and woman-woman connectivities-are used to illustrate that subjectivity is partial and transitory. Disability connectivity thus serves a signpost for an expanded understanding of subjectivity and suggests a radically altered ethics that is no longer premised on individual rights. 相似文献
976.
Field T Hernandez-Reif M Diego M Figueiredo B Schanberg S Kuhn C 《Infant behavior & development》2006,29(2):268-275
Three hundred depressed pregnant women were recruited at approximately 20 weeks gestation. They were then divided by a median split into high and low urinary cortisol level groups. The high cortisol group had higher CES-D depression scores and higher inhibition (BIS) scores prenatally. Their fetuses had smaller head circumference, abdominal circumference, biparietal diameter and fetal weight. The high cortisol group neonates were shorter gestational age and lower birthweight and they had lower Brazelton habituation and higher Brazelton reflex scores. Discriminant function analyses suggested that cortisol levels more accurately classified short gestation and low birthweight groups than CES-D depression scores. 相似文献
977.
Prenatal paternal depression 总被引:2,自引:0,他引:2
Field T Diego M Hernandez-Reif M Figueiredo B Deeds O Contogeorgos J Ascencio A 《Infant behavior & development》2006,29(4):579-583
Prenatal depressive symptoms, anxiety, anger and daily hassles were investigated in 156 depressed and non-depressed pregnant women and their depressed and non-depressed partners (fathers-to-be). Depressed versus non-depressed fathers had higher depression, anxiety and daily hassles scores. Although the pregnant women in general had lower anxiety, anger and daily hassles scores than the men, the scores on the measures for depressed fathers and depressed mothers did not differ. Paternal depression appeared to have less effect than maternal depression on their partners’ scores. However, the similarity between the scores of depressed mothers and depressed fathers highlights the importance of screening for depression in fathers-to-be as well as mothers-to-be during pregnancy. 相似文献
978.
Norrholm SD Jovanovic T Vervliet B Myers KM Davis M Rothbaum BO Duncan EJ 《Learning & memory (Cold Spring Harbor, N.Y.)》2006,13(6):681-685
The purpose of this study was to analyze fear extinction and reinstatement in humans using fear-potentiated startle. Participants were fear conditioned using a simple discrimination procedure with colored lights as the conditioned stimuli (CSs) and an airblast to the throat as the unconditioned stimulus (US). Participants were extinguished 24 h after fear conditioning. Upon presentation of unsignaled USs after extinction, participants displayed significant fear reinstatement. In summary, these procedures produced robust fear-potentiated startle, significant CS+/CS- discrimination, within-session extinction, and significant reinstatement. This is the first demonstration of fear extinction and reinstatement in humans using startle measures. 相似文献
979.
Pronk JC van Kollenburg B Scheper GC van der Knaap MS 《Mental retardation and developmental disabilities research reviews》2006,12(2):123-128
Leukoencephalopathy with vanishing white matter (VWM) is an autosomal recessive brain disorder, most often with a childhood onset. Magnetic resonance imaging and spectroscopy indicate that, with time, increasing amounts of cerebral white matter vanish and are replaced by fluid. Autopsy confirms white matter rarefaction and cystic degeneration. The process of localization and identification of the first two genes related to VWM, EIF2B5 and EIF2B2, was facilitated by two founder effects in the Dutch population. EIF2B5 and EIF2B2 encode the epsilon and beta subunits of translation initiation factor eIF2B. Soon it was shown that mutations in all five eIF2B subunit genes can cause VWM. EIF2B is essential for the initiation of translation of RNA into protein and is involved in regulation of the process, especially under stress conditions, which may explain the sensitivity to stress conditions observed in VWM patients. The pathophysiology of the disease is still poorly understood. 相似文献
980.