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Predicting auditory space calibration from recent multisensory experience.

Mendonça C, Escher A, van de Par S, Colonius H - Exp Brain Res (2015)

Bottom Line: Multisensory experience can lead to auditory space recalibration.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Signal Processing and Acoustics, Aalto University, Otakaari 5, 02150, Espoo, Finland, Catarina.Hiipakka@aalto.fi.

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.

No MeSH data available.


Related in: MedlinePlus

Localization shifts in auditory trials as a function of previous sequence. A Shifts when audiovisual sequence trials 1 (SQ1) to 5 (SQ5) were discrepant (black) or matching (red). B Shifts in the case of sequences with only one discrepant trial and four matching trials. Values show the shift when only the first (SQ1) to fifth (SQ5) trials were discrepant (color figure online)
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Fig4: Localization shifts in auditory trials as a function of previous sequence. A Shifts when audiovisual sequence trials 1 (SQ1) to 5 (SQ5) were discrepant (black) or matching (red). B Shifts in the case of sequences with only one discrepant trial and four matching trials. Values show the shift when only the first (SQ1) to fifth (SQ5) trials were discrepant (color figure online)

Mentions: To analyze in more detail the localization shifts in the auditory trials due to prior presented sequences, we calculated the average response shift observed when each of the five audiovisual trials (SQ1–SQ5) was discrepant or not (Fig. 4a). As an example, in Fig. 4a, the leftmost red (circle) value reports the average shift in auditory localization after all sequences in which the first event of the sequence (SQ1) was matching.Fig. 4


Predicting auditory space calibration from recent multisensory experience.

Mendonça C, Escher A, van de Par S, Colonius H - Exp Brain Res (2015)

Localization shifts in auditory trials as a function of previous sequence. A Shifts when audiovisual sequence trials 1 (SQ1) to 5 (SQ5) were discrepant (black) or matching (red). B Shifts in the case of sequences with only one discrepant trial and four matching trials. Values show the shift when only the first (SQ1) to fifth (SQ5) trials were discrepant (color figure online)
© Copyright Policy - OpenAccess
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4464732&req=5

Fig4: Localization shifts in auditory trials as a function of previous sequence. A Shifts when audiovisual sequence trials 1 (SQ1) to 5 (SQ5) were discrepant (black) or matching (red). B Shifts in the case of sequences with only one discrepant trial and four matching trials. Values show the shift when only the first (SQ1) to fifth (SQ5) trials were discrepant (color figure online)
Mentions: To analyze in more detail the localization shifts in the auditory trials due to prior presented sequences, we calculated the average response shift observed when each of the five audiovisual trials (SQ1–SQ5) was discrepant or not (Fig. 4a). As an example, in Fig. 4a, the leftmost red (circle) value reports the average shift in auditory localization after all sequences in which the first event of the sequence (SQ1) was matching.Fig. 4

Bottom Line: Multisensory experience can lead to auditory space recalibration.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.

View Article: PubMed Central - PubMed

Affiliation: Department of Signal Processing and Acoustics, Aalto University, Otakaari 5, 02150, Espoo, Finland, Catarina.Hiipakka@aalto.fi.

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.

No MeSH data available.


Related in: MedlinePlus