Spontaneously emerging patterns in human visual cortex and their functional connectivity are linked to the patterns evoked by visual stimuli
نویسندگان
چکیده
منابع مشابه
An fMRI study of human visual cortex in response to spatiotemporal properties of visual stimuli
ABSTRACT Background: The brain response to temporal frequencies (TF) has been already reported, but with no study reported for different TF with respect to various spatial frequencies (SF). Materials and Methods: fMRI was performed by 1.5T GE-system in 14 volunteers during checkerboard, with TFs of 4, 6, 8 and 10Hz in low and high SFs of 0.5 and 8cpd. Results: Average percentage BOLD signa...
متن کاملan fmri study of human visual cortex in response to spatiotemporal properties of visual stimuli
abstract background: the brain response to temporal frequencies (tf) has been already reported, but with no study reported for different tf with respect to various spatial frequencies (sf). materials and methods: fmri was performed by 1.5t ge-system in 14 volunteers during checkerboard, with tfs of 4, 6, 8 and 10hz in low and high sfs of 0.5 and 8cpd. results: average percentage bold signal ...
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world through the relatively small windows of their receptive fields. This creates a perceptual dilemma known as the ‘aperture problem’, in which the locally ambiguous views of individual cells must be resolved into higher-order percepts that are consistent with the whole. When cells in V1 see a moving plaid (grid), for example, they respond to the direction and orientation of the component lin...
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To what extent does the visual system's activity fluctuate when no sensory stimulation is present? Here, we studied this issue by examining spontaneous fluctuations in BOLD signal in the human visual system, while subjects were placed in complete darkness. Our results reveal widespread slow fluctuations during such rest periods. In contrast to stimulus-driven activity, during darkness, function...
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ژورنال
عنوان ژورنال: Journal of Neurophysiology
سال: 2020
ISSN: 0022-3077,1522-1598
DOI: 10.1152/jn.00630.2019