Cognitive factors and adaptation to auditory-visual discordance

Subjects pointed blindfolded at auditory targets before and after exposure to spatial conflict between the sound of a percussion instrument and images on a TV screen. Four experimental conditions were obtained by combining two levels of realism, in which sound was paired with either the image of the hands playing the instrument or with synchronously modulated light, and two levels of suggestion, in which a dummy loudspeaker from which the subjects had been told the sound would come was placed either in front of the TV screen or on top of the actual hidden loudspeaker. Adaptation occurred in all four conditions, but no difference between them was detected. These results confirm and extend the previous finding that auditory adaptation, unlike the impression of fusion (ventriloquism), is little influenced by cognitive factors.