Spike trains were recorded from single optic tract (OT) fibres in cats immobilized with local anesthesia. Markov properties of nonstationary spike trains were investigated every 20 msec from 1.0 sec before to 1. 5 sec after the light spot presentation. A statistic which evaluates the order and the values of Markov properties was developed and employed in nonstationary spike trains.
In X-type OT responses, the order of Markov properties was the 1-st ; and the value increased for about 370 msec after the light was on, and gradually and continuingly increased for about 510 msec at the congest before the light was off.
On the other hand, in Y-type OT responses, the order of Markov properties was the 1-st ;and the value increased for about 120 msec after the light was on, increased gradually for about 360 msec at the congest, and decreased to the control level for about 1.0 sec.
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