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691.
Petersson KM Sandblom J Gisselgård J Ingvar M 《Scandinavian journal of psychology》2001,42(3):197-216
The medial temporal lobe has been implicated in studies of episodic memory tasks involving spatio-temporal context and object-location conjunctions. We have previously demonstrated that an increased level of practice in a free-recall task parallels a decrease in the functional activity of several brain regions, including the medial temporal lobe, the prefrontal, the anterior cingulate, the anterior insular, and the posterior parietal cortices, that in concert demonstrate a move from elaborate controlled processing towards a higher degree of automaticity. Here we report data from two experiments that extend these initial observations. We used a similar experimental approach but probed for effects of retrieval paradigms and stimulus material. In the first experiment we investigated practice related changes during recognition of object-location conjunctions and in the second during free-recall of pseudo-words. Learning in a neural network is a dynamic consequence of information processing and network plasticity. The present and previous PET results indicate that practice can induce a learning related functional restructuring of information processing. Different adaptive processes likely subserve the functional re-organisation observed. These may in part be related to different demands for attentional and working memory processing. It appears that the role(s) of the prefrontal cortex and the medial temporal lobe in memory retrieval are complex, perhaps reflecting several different interacting processes or cognitive components. We suggest that an integrative interactive perspective on the role of the prefrontal and medial temporal lobe is necessary for an understanding of the processing significance of these regions in learning and memory. It appears necessary to develop elaborated and explicit computational models for prefrontal and medial temporal functions in order to derive detailed empirical predictions, and in combination with an efficient use and development of functional neuroimaging approaches, to further the understanding of the processing significance of these regions in memory. 相似文献
692.
Does dyslexia develop from learning the alphabet in the wrong hemisphere? A cognitive neuroscience analysis 总被引:4,自引:0,他引:4
Mather DS 《Brain and language》2001,76(3):282-316
A new perspective is described which views developmental dyslexia as the outcome of learning to write the alphabet in the nondominant (right) hemisphere. The letter-level and whole-word subtypes of dyslexia are seen as differing responses adopted to cope with this predicament. Striking similarities between dyslexics and callosotomy patients in the allocation of covert attention to lateralized stimuli provide direction for integrating a diversity of dyslexic research within this framework. This synthesis, together with information from pure alexia, brain activation, and reading research, lends insight into the neural circuitry of the compensatory strategies adopted by the two dyslexic subtypes. 相似文献
693.
S.M. Ennaceur 《Philosophical Magazine Letters》2013,93(11):502-510
ABSTRACTWe present here the first direct measurement of the radiation-damage-induced energy stored in δ-phase plutonium. The primary mode of radioactive decay of 239Pu occurs with a time constant of τ=1.1?×?1012?s. Each decay imparts about 85?keV of recoil energy to the uranium byproduct, 5.2?Mev to the alpha particle, and a spectrum of mostly low energy gamma rays with the most probable at 51?keV [1]. Most of the decay energy is converted immediately to heat, releasing about 1.9?mW/g. However, some thermally-recoverable energy remains trapped. Reported here are measurements of that stored energy using differential scanning calorimetry (DSC) applied to 239Pu-2.0 at.%Ga δ-phase alloy. Retained energy of ~2 J/g saturates at about 5 months and is unchanged after 30 years. The magnitude of the stored energy agrees with a short-bond defect model that that we present here. This model treats radiation damage as a Pu impurity with shortened bond lengths. It explains the change in known properties with age and predicts that density increases with age, contrary to current thinking. The short-bond impurities proposed are expected to act like other impurities, affecting strength, phase transitions, grain boundaries and other metallurgical properties. 相似文献
694.
He and H can be produced by nuclear reaction. In addition, energetic particles of He and T and D, which are isotopes of H, in the plasma of fusion reactor induce the damage in the surface of materials, such as erosion, sputtering and blistering. To investigate the interaction of He and D, amorphous and crystalline FeBSi alloys were irradiated by He or D2 or He?+?D2 ions with 5?keV. The results of thermal desorption indicated that more He atoms were trapped in both the amorphous and crystalline alloy irradiated by He ions than D atoms in those alloys irradiated by D2 ions. Although He and D atoms were trapped in FeBSi alloy irradiated by He?+?D2 ions, desorption peaks of D2 and He were separated. Absorption of D in an amorphous alloy was influenced by the presence of He; however, absorption of He was independent of D2 irradiation in both alloys. 相似文献
695.
《Women & Therapy》2013,36(1-2):3-26
Abstract Women living with Traumatic Brain Injury (TBI) typically experience social and emotional sequelae that can be effectively addressed in the context of a psychotherapeutic relationship. Traumatic Brain Injuries can affect the full range of human functioning, from activities of daily living to experiencing a coherent sense of self. In this article, we focus on two issues, social isolation and emotional functioning, that encompass a number of key challenges facing women with TBI and are common and fruitful foci of psychotherapy. Social isolation includes marginalization in multiple communities, the invisibility of cognitive disabilities, difficulties in interpersonal relationships, and difficulties in employment and access to transportation. Emotional functioning includes posttraumatic stress symptoms, loss of self-esteem, anxiety, depression, anger, and shame. Two exemplary cases are used to illustrate the themes and underscore the complexities and realities of adjusting to TBI. Recommendations for therapists and consumers are woven throughout the paper. 相似文献
696.
Successful interaction with the environment depends on flexible behaviors which require shifting attention, inhibiting primed responses, ignoring distracting information, and withholding motor responses. These abilities, termed executive function (EF), are believed to be mediated by inhibitory processes in the frontal lobes. Superior performance on EF tests (i.e., faster reaction times (RT), and fewer errors) has been shown in bilinguals compared to monolingual speakers. However, findings are inconsistent, and no study has directly linked this bilingual advantage to frontal lobe inhibitory processes. To clarify this uncertainty, we concomitantly tested neural inhibitory processes and behavioral responses on an EF test in bilinguals and monolinguals. Specifically, we compared English monolinguals (N = 15) to Spanish/English bilinguals (N = 13) on event-related brain potentials (ERP) during a non-linguistic, auditory Go/NoGo task, a task linked to non-motor, cognitive inhibition in monolinguals. Participants responded with a button press on trials in which target tone-pairs (Go trials) were presented and withheld their responses on non-target trials (NoGo trials). Results revealed significantly greater inhibition (i.e., greater mean N2 amplitude) in bilinguals compared to monolinguals during NoGo trials even though both groups performed the task equally well (i.e., withheld a motor response). On Go trials where participants pressed a response button, neither ERPs nor RT distinguished the groups. Additionally, scores on a second language proficiency test (i.e., English in our bilingual group) were positively correlated with N2 amplitude. These findings are the first to directly link this bilingual advantage to a neural correlate of inhibition and to reveal that inhibition in bilinguals is moderated by second language proficiency. Results are discussed in the context of plasticity, and we propose that evaluating bilinguals at varying levels of second-language proficiency may serve as a model of human neuroplasticity. 相似文献
697.
《Journal of couple & relationship therapy》2013,12(1):21-28
Healthy coupling, defined as coupling which supports the growth of the personhood of both partners, is explored herin. Healthy coupling is viewed as being based on a rhythm of confluence (formation of a "We" from the "I" and the "Thou") and difluence (clear differentiation of an "I" and a "Thou" from the "We"). Criteria for the recognition of natural, flexible confluence and difluence are contrasted with those of an unnatural, rigid pattern. 相似文献
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