title: Predicting auditory space calibration from recent multisensory experience.
abstract: Multisensory experience can lead to auditory space recalibration. After exposure to discrepant audiovisual stimulation, sound percepts are displaced in space, in the direction of the previous visual stimulation. This study focuses on identifying the factors in recent sensory experience leading to such auditory space shifts. Sequences of five audiovisual pairs were presented, each randomly congruent or discrepant in space. Each sequence was followed by a single auditory trial and two visual trials. In each trial, participants had to identify the perceived stimuli positions. We found that auditory localization is shifted during audiovisual discrepant trials and during subsequent auditory trials, suggesting a recalibration effect. Time did not lead to greater recalibration effects. The last audiovisual trial affects the subsequent auditory shift the most. The number of discrepant trials in a sequence, and the number of consecutive trials in sequence, also correlated with the subsequent auditory shift. To estimate the individual contribution of previously presented trials to the recalibration effect, a best-fitting model was developed to predict the shift in a linear weighted combination of stimulus features: (1) whether matching or discrepant trials occurred in the sequence, (2) total number of discrepant trials, and (3) maximum number of consecutive discrepant trials, (4) whether the last trial was discrepant or not. The selected model consists of a function including as properties the type of stimulus of the last audiovisual sequence trial and the overall probability of mismatching trials in sequence.
authors: Department of Signal Processing and Acoustics, Aalto University, Otakaari 5, 02150, Espoo, Finland, Catarina.Hiipakka@aalto.fi.
authors: Catarina
authors: C
authors: Mendonça
authors: Andreas
authors: A
authors: Escher
authors: Steven
authors: S
authors: van de Par
authors: Hans
authors: H
authors: Colonius
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D008297:Male; D010775:Photic Stimulation; D011601:Psychophysics; D011930:Reaction Time; D013017:Sound Localization / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult