نتایج جستجو برای: frontal cortex
تعداد نتایج: 172099 فیلتر نتایج به سال:
Early visual areas in occipital cortex are known to be retinotopic. Recently, retinotopic maps have been reported in frontal and parietal cortex during spatial attention and working memory. The present event-related potential (ERP) and functional magnetic resonance imaging (fMRI) study determined whether spatial long-term memory was associated with retinotopic activity in frontal and parietal r...
Two previous studies have shown that frontal-temporal disconnection in monkeys, produced by unilateral ablation of frontal cortex in one hemisphere and of visual inferior temporal cortex in the opposite hemisphere is entirely without effect on visual object-reward association learning in concurrent discrimination tasks. This is a surprising finding in light of the severe impairments that follow...
Ten fluent speakers and nine developmental stutterers read isolated nouns aloud in a delayed reading paradigm. Cortical activation sequences were mapped with a whole-head magnetoencephalography system. The stutterers were mostly fluent in this task. Although the overt performance was essentially identical in the two groups, the cortical activation patterns showed clear differences, both in the ...
Using multivoxel pattern analysis (MVPA), we studied how distributed visual representations in human occipitotemporal cortex are modulated by attention and link their modulation to concurrent activity in frontal and parietal cortex. We detected similar occipitotemporal patterns during a simple visuoperceptual task and an attention-to-working-memory task in which one or two stimuli were cued bef...
Abstract Voluntary allocation of visual attention is controlled by top-down signals generated within the Frontal Eye Fields (FEFs) that can change excitability lower-level areas. However, mechanism through which this control achieved remains elusive. Here, we emulated generation an attentional signal using single-pulse transcranial magnetic stimulation to activate FEFs and tracked its consequen...
Rat ncuronal nitric oxide (NO) synthase (nNOS) activity was measured in frontal cortex, hippocampus, striatum and cerebellum using the assay of [H]citrulline, following chronic alcoholization. The Hn and V ^ values were significantly increased in the frontal cortex and in the striatum, and were not affected in the cerebellum and hippocampus.
BACKGROUND Impairments in social cognition have been described in schizophrenia and relate to core symptoms of the disorder. Social cognition is subserved by a network of brain regions, many of which have been implicated in schizophrenia. We hypothesized that deficits in connectivity between components of this social brain network may underlie the social cognition impairments seen in the disord...
Medial frontal cortex and response conflict: Evidence from human intracranial EEG and medial frontal cortex lesion. (2008). Evaluating the negative or valuing the positive? Neural mechanisms supporting feedback-based learning across development. (2008). Striatum and pre-SMA facilitate decision-making under time pressure.
Purpose: This study is designed to determine the sex differences in volume of human cerebral cortex in different lobes of left hemisphere in right- handed normal subjects and the right-handed subjects which were suffered from Alzheimer and Parkinson diseases. Materials and Methods: This study was performed on 72 normal human brains (38 males, 34 females), 11 brains suffered from Alzheimer (4 m...
Various prefrontal cortical regions have been shown to be activated during emotional stimulation, whereas neurochemical mechanisms underlying emotional processing in the prefrontal cortex remain unclear. We therefore investigated the influence of the GABA-A potentiator lorazepam on prefrontal cortical emotional-motor spatio-temporal activation pattern in a combined functional magnetic resonance...
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