ON THE ACTION OF THE OPTIC LOBE OF LIMULUS LONGSPINA

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1) Spontaneous discharges in the central ganglion are of two types; the direction of discharge of one type is similar to that of discharges in response to illumination, and discharges of the other kind originate in the motor area.
2) When the lateral eye of the crab is exposed to light action current discharges, “on-responses” are recognized in the optic lobe with a frequency about 15 per sec., and discharge “off-responses” are also revealed in response to thecessation of illumination with a frequency about 10 per sec.
The “on-responses” are very labile and liable to disapper very soon, but the “off-responses” survive usually several minutes longer than the former.