Oxygen Tension Changes Evoked in the Brain by Visual Stimulation

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Science  09 Jun 1967:
Vol. 156, Issue 3780, pp. 1392-1393
DOI: 10.1126/science.156.3780.1392


Localized changes in oxygen tension were recorded with platinum cathodes placed in the lateral geniculate nucleus in both anesthetized and awake cats. The amplitude of the responses increased with increasing stimulus intensity, but decreased with increasing flash rate. Both increases and decreases in cathode current were produced by steady illumination. The characteristics of the responses suggest that the responses reflect localized variations in blood flow, produced in turn by changes evoked in the tonic neural activity of the lateral geniculate nucleus.