Abstract：
:The feedback effect of activity of area 21a on orientation maps of areas 17 and 18 was investigated in cats using intrinsic signal optical imaging. A spatial frequency-dependent decrease in response amplitude of orientation maps to grating stimuli was observed in areas 17 and 18 when area 21a was inactivated by local injection of GABA, or by a lesion induced by liquid nitrogen freezing. The decrease in response amplitude of orientation maps of areas 17 and 18 after the area 21a inactivation paralleled the normal response without the inactivation. Application in area 21a of bicuculline, a GABAa receptor antagonist caused an increase in response amplitude of orientation maps of area 17. The results indicate a positive feedback from high-order visual cortical area 21a to lower-order areas underlying a spatial frequency-dependent mechanism.
journal_name
Brain Resjournal_title
Brain researchauthors
Huang L,Chen X,Shou Tdoi
10.1016/j.brainres.2003.11.024subject
Has Abstractpub_date
2004-02-20 00:00:00pages
194-201issue
2eissn
0006-8993issn
1872-6240pii
S0006899303040629journal_volume
998pub_type
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