TEMPORAL CHANGE IN RESPONSE BIAS OBSERVED IN EXPERT ANTICIPATION OF VOLLEYBALL SPIKES
Anticipation is an important cognitive skill in sports. Although clear expert-novice differences in anticipation skills have been identified, it remains unclear whether the differences reflect purely perceptual processes, or include non-perceptual, judgmental component. To investigate this issue, we examined whether anticipation ability of expert volleyball players is affected by response bias in the context of signal detection theory. In the experiment, the participants observed video stimuli simulating offensive attack from the perspective of a defensive player and were required to judge attack type (spike or feint) and course (right or left). The video stimuli were cut off before or after the moment of hand-ball contact. Signal detection analysis showed that expert players were more sensitive than novices to differences between spike and feint and that experts were biased to judge an attack as a spike immediately before the spiker jumps. These results suggest that expertsâ€™ prediction would be affected by response bias.