Summary
Stimulus dependence of ocular dominance of 31 deep-layer complex cells was assessed from detailed monocular directional tuning curves for motion of bar stimuli or fields of static visual noise, in area 17 of normal adult cats, lightly anaesthetised with N2O/O2 supplemented with pentobarbitone. Virtually all cells were binocularly driven, with the anticipated ocular dominance distribution. Interocular differences in directional bias and sharpness of directional tuning for noise were observed in eleven cells, whereas preferred direction and sharpness of tuning for bar stimuli were similar for each eye. In the majority of cells (20/31), any differences between noise and bar tuning in one eye were replicated in the other. Ocular dominance of about half the cells (17/31) for noise and for bar motion was similar, or marginally shifted by up to one ocular dominance group. Substantial shifts in ocular dominance were seen in 14 cells — by up to two ocular dominance groups in 12 cells and by up to three ocular dominance groups in two cells. In three cases these shifts involved a reversal of eye dominance. Notwithstanding these changes, there were no obvious trends in shifts of ocular dominance in favour of the ipsilateral or contralateral eye, nor was there any tendency towards increased binocularity for noise.
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Hammond, P. Stimulus dependence of ocular dominance of complex cells in area 17 of the feline visual cortex. Exp Brain Res 35, 583–589 (1979). https://doi.org/10.1007/BF00236773
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DOI: https://doi.org/10.1007/BF00236773