Abstract
Over 50% of all just noticeably different footshock intensities lie below ,3 mA for rats. Unfortunately, the suppression of the rat’s locomotor activity by low-intensity footshock precludes the use of these shock intensities in active escape or avoidance training. This activity-suppression effect was demonstrated in an alley and in a tilt cage. One explanation of this effect is that rats remain relatively immobile in order to avoid painful peaks in current density that occur when the animals’ paws make or break contact with “hot” grids. If this explanation is correct, the activity-suppression effect should be more pronounced with higher impedance shock sources. Some evidence is reported that is consistent with this explanation.
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