An electrophysiological study was made with kindled rabbits (which were experimentaly produced in the amygdaloid nucleus, hippocampus, septal nucleus and cerebral cortex) on the electrical changes of photopalpebral reflex (PPR) and photo-evoked eyelid microvibration (MV).The results obtained were as follows.1) In control group, no rema r kable change was observed in the PPR and MV.2) In amygdaloid kindled-group, the period required for the completion of the kindling effect was 7 to 21 days (average,16 days). The afterdischarge was propagated to cerebral cortex and hippocampus on the first trial.3) In amygdaloid-kindled group, the afterdischarge threshold was from 0.7 upto 2.6mA (average,1.5mA). The duration time of afterdischarge extended from 2 to 13 sec. (average,6sec. ) on the first trial to 12 to 86 sec. (average,46.8 sec. ) on the last trial after the kindling effect was completed.4) In amygdaloid -kindled group, the amplitude of MV increased in the early stage, but stepped down later. The amplitude of PPR1_4,6,9 showed no marked change. The PPR7,8increased remarkably and the PPR5 slightly following the initiation of stmulation.5) In hippocampus-kindled group, the period required for the comp letion of the kindling effect was 19 to 190 days (average,72 days). The afterdischarge was propagated to the amygdaloid nucreus, but not to the cerebral cortex on the first triral.6) In hippocampus-kindled group, the afterdischarge threshold was from O.6 upto 1.4 mA (average,1. imA). The duration of the afterdischarge extended from 6.5 to 16 sec. (average,9.3 sec. ) on the first trial to 12 to 281 sec. (average,178 sec) on the last trial.7) In hippocampns-kindled group, the amplitude of MV increased remarkabl y following the initiation of stimulation. The amplitude of PPR 1-4 showed no marked change, while the PPR5-8 increased in amplitude. The PPR9 either increased or decreased by cases.8) In septal nudes-kindled group, the period required for the completion of the kindling effect was 17 to 38 days (average,26 days). The afterdischarge was propagated to the amygdaloid nucleus and hippocampus, but not to the cerebral cortex except one case on the first trial.9) In septal nucleus-kindled group, the afterdischarge threshold was from 1.8 upto 4.6mA (average,3.4mA). The duration of the afterdischarge extanded from 2 to 16 sec. (average,6.8 sec. ) on the first trial to 20 to 311 sec. (average,121 sec. ) on the last trial.10) In septal nucleus-kindled group, the amplitude of PPR1-4 showed no mark ed change, while the PPR5-9 incresed. The amplitude of MV increased in the early stage and later decreased gradually.11) In ce rebral cortex-kindled group, the period required for the completion of the kindling effect was 16 to 64 days (avetage,33 days). The afterdischarge was propagated to the amygdaloid nucleus and the hippocampus on the first trial.12) In cerebral cortex-kindled group, the afterdischar ge threshold was from 0 4 upto 3.8mA (average,1.4mA). The duration of the afterdischarge extended from 5 to 28sec. (average,13.6 sec. ) on the first trial to 14 to 206 sec. (average,67.6sec. ) on the last trial.13) In cerebral cortex-kindled group, the amplitude of MV increased. The amplitude of PPR1-4 showed no marked change, while the PPR5-9 increased.