サルの視覚誘発電位波形中の反対色応答率

抄録

Visually evoked potentials for stimuli of various monochromatic lights were recorded at three positions in the visual pathway of a monkey brain; namely the optic tract (OT), the lateral geniculate body (LGB), and the visual cortex (VC). Waveforms of these potentials were analyzed applying the principal component analysis, and the opponent color responses were derived at each position. It seems that the 1st and the 2nd scores correspond to the opponent color responses of the Yellow-Blue and the Red-Green components, respectively. These opponent color responses are very similar to those of the human brain.
In the analyzing process of visually evoked potentials, the first and the second characteristic vectors were precisely calculated by using the technique of the singular value decomposition. These characteristic vectors are regarded as carriers of color information, and are supposed to correspond to the basic waveforms which transmit the Yellow-Blue and the Red-Green responses. And the : phase relation between those characteristic vectors is discussed.
The contribution of the 1st characteristic value, which corresponds to the Yellow-Blue response, gradually increases from the OT to the LGB and the VC. This phenomenon might be caused by the enhancement of the blue component, suggested by DeValois et al.