Timing in free-operant and discrete-trial avoidance.

Hineline et al. (1970) compared two ways to run avoidance sessions. One group used free-operant avoidance. The other used discrete-trial avoidance.

They tracked how rats timed their responses under each setup. The goal was to see if timing matched either the two-factor theory or the shock-frequency-reduction theory.

Rats showed timing under both setups, but the pattern differed. Good timing did not line up with fewer shocks.

Neither old theory fully explained the data. Timing happened, yet it did not predict who avoided shocks best.

Bloomfield (1967) first showed that lever-holding time tracks the response-shock interval. Hineline et al. (1970) widened the lens by asking if that timing helps the animal at all. It did not.

Catania et al. (1966) proved that longer equal RS and SS intervals cut response rate and shocks. Hineline et al. (1970) add a twist: even when animals time well, shock count may not drop.

Reberg et al. (1979) later split the press and release intervals to sculpt bar-hold topography. Their fine control builds on N’s finding that timing is there, yet success needs more than precision.

If you run avoidance or punishment procedures, do not assume smooth timing equals learning. Track timing separately from shock count. You may need extra reinforcement or stimulus control to turn good timing into true avoidance. Watch the data, not the clock.