Abstract：
:An unresolved issue in visual motion perception is how distinct are the processes underlying 'first-order' and 'second-order' motion. The former is defined by spatio-temporal variations of luminance and the latter by spatio-temporal variations in other image attributes such as contrast or depth, for example. Using neuroimaging and psychophysics we present data from four neurological patients with unilateral and mostly cortical infarcts, which strongly suggest that first- and second-order motion have a different neural substrate. We found that from the early stages of processing, these two types of motions are mediated by two distinct pathways: first-order motion is carried out by mechanisms along the dorsal pathway in the occipital lobe, while the second-order motion by mechanisms mostly along the ventral pathway. The data reported here also suggest that different cortical regions may be in charge of processing direction-discrimination in second-order motion defined by different second-order attributes.
journal_name
Prog Brain Resjournal_title
Progress in brain researchauthors
Vaina LM,Soloviev Sdoi
10.1016/S0079-6123(03)14414-7subject
Has Abstractpub_date
2004-01-01 00:00:00pages
197-212eissn
0079-6123issn
1875-7855pii
S0079-6123(03)14414-7journal_volume
144pub_type
杂志文章,评审abstract：:The dorsal striatum (caudate putamen) contains two types of GABAergic medium spiny neurons (MSNs) that are distinguished by the expression of either the opioid peptide, enkephalin, or the opioid peptide, dynorphin, as well as the tachykinin substance P. Pharmacological studies suggest that these peptides modulate loca...
journal_title：Progress in brain research
pub_type： 杂志文章,评审
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abstract：:It is widely believed that mammalian CNS axons have little regenerative capacity because their environment is non-permissive to regrowth. This viewpoint is based, in large part, on the fact that in virtually all previous studies on regeneration following spinal cord injury, regenerated axonal projections have been few...
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更新日期：2004-01-01 00:00:00
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pub_type： 杂志文章,评审
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pub_type： 杂志文章,评审
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journal_title：Progress in brain research
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更新日期：2007-01-01 00:00:00
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更新日期：2013-01-01 00:00:00
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pub_type： 杂志文章,评审
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pub_type： 杂志文章,评审
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更新日期：2006-01-01 00:00:00
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更新日期：1992-01-01 00:00:00
