Abstract
The forced-choice preferential looking procedure (FPL: Teller, 1979) was modified to accommodate a yes/no signal detection task for measuring infants' detection of motion. Three experiments are reported that assessed the reliability of detectabilities derived from this new procedure, the sensitivity of the procedure to age differences in motion detectability, and the comparability of estimates of signal detectability produced by the new procedure and the standard, two-alternative, forced-choice procedure (2AFC). The stability of detectability over 1 week was moderately high (r = .77), and consistency within a session was quite high (r = .87). Six-week-olds were much less sensitive to motion than were 14-week-olds. The estimates of signal detectability produced by the yes/no procedure were comparable to those produced by the 2AFC procedure. The results demonstrate for the first time that a rigorous yes/no signal detection procedure can be used in infant visual psychophysics.
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