TABLE II.

Adaptation strategies for performance targets (after Levitt, 1971).

Rule	Target level(%-correct)	Increase bandwidthafter observing…	Decrease bandwidthafter observing…
1	15.9	Four consecutive misses	Three or fewer misses followed by a correct guess
2	29.3	Two consecutive misses	One correct guess or one miss followed by a correct guess
3	50.0	Two misses in two or three consecutive trials	Two correct guesses in two or three consecutive trials
4	70.7	One miss or one correct guess followed by a miss	Two consecutive correct guesses
5	84.1	Three or fewer correct guesses followed by a miss	Four consecutive correct guesses