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Sensory adaptation for timing perception.

Roseboom W, Linares D, Nishida S - Proc. Biol. Sci. (2015)

Bottom Line: Here, we show that the effect of recent experience on timing perception is not just subjective; recent sensory experience also modifies relative timing discrimination.This result indicates that recent sensory history alters the encoding of relative timing in sensory areas, excluding explanations of the subjective phenomenon based only on decision-level changes.The existence of these components would suggest that previous explanations of how recent experience may change the sensory encoding of timing, such as changes in sensory latencies or simple implementations of neural population codes, cannot account for the effect of sensory adaptation on timing perception.

View Article: PubMed Central - PubMed

Affiliation: NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morino-sato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan wjroseboom@gmail.com.

ABSTRACT
Recent sensory experience modifies subjective timing perception. For example, when visual events repeatedly lead auditory events, such as when the sound and video tracks of a movie are out of sync, subsequent vision-leads-audio presentations are reported as more simultaneous. This phenomenon could provide insights into the fundamental problem of how timing is represented in the brain, but the underlying mechanisms are poorly understood. Here, we show that the effect of recent experience on timing perception is not just subjective; recent sensory experience also modifies relative timing discrimination. This result indicates that recent sensory history alters the encoding of relative timing in sensory areas, excluding explanations of the subjective phenomenon based only on decision-level changes. The pattern of changes in timing discrimination suggests the existence of two sensory components, similar to those previously reported for visual spatial attributes: a lateral shift in the nonlinear transducer that maps relative timing into perceptual relative timing and an increase in transducer slope around the exposed timing. The existence of these components would suggest that previous explanations of how recent experience may change the sensory encoding of timing, such as changes in sensory latencies or simple implementations of neural population codes, cannot account for the effect of sensory adaptation on timing perception.

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Related in: MedlinePlus

Changes in sensitivity after exposure to asynchrony/synchrony. (a) Proportion of correct responses as a function of the asynchrony for participants YI (left) and WR (right) for the different conditions. The dotted vertical lines indicate the exposed asynchrony. For the no exposure condition, the data points and the curves are plotted three times for each participant to facilitate comparison with the other exposure conditions. (b) Two-thirds thresholds for each participant and for the average across participants for the different conditions. The error bars correspond to the 95% CIs calculated according to Morey [18].
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RSPB20142833F2: Changes in sensitivity after exposure to asynchrony/synchrony. (a) Proportion of correct responses as a function of the asynchrony for participants YI (left) and WR (right) for the different conditions. The dotted vertical lines indicate the exposed asynchrony. For the no exposure condition, the data points and the curves are plotted three times for each participant to facilitate comparison with the other exposure conditions. (b) Two-thirds thresholds for each participant and for the average across participants for the different conditions. The error bars correspond to the 95% CIs calculated according to Morey [18].

Mentions: First, we describe the results for the participants who completed the largest number of trials (YI completed 11 820 trials and WR 11 880 trials, each taking approximately 35 h, see the electronic supplementary material, Methods). As expected, the proportion of correct identifications increased with asynchrony (figure 2a, black diamonds). Positive asynchronies indicate audio–visual pairs wherein the visual event leads the auditory event (VA asynchrony) and negative asynchronies indicate that the auditory event leads the visual event (AV asynchrony). Repeated exposure to VA asynchrony impaired the ability of participants to discriminate VA asynchronies, but improved their ability to discriminate AV asynchronies (figure 2a, bottom row, green triangles). Similarly, repeated exposure to AV asynchrony impaired discriminability of AV asynchronies, but improved discriminability of VA asynchronies (figure 2a, central row, blue circles). Lastly, repeated exposure to audio–visual synchrony improved discriminability of both VA and AV asynchronies (figure 2a, top row, red squares).Figure 2.


Sensory adaptation for timing perception.

Roseboom W, Linares D, Nishida S - Proc. Biol. Sci. (2015)

Changes in sensitivity after exposure to asynchrony/synchrony. (a) Proportion of correct responses as a function of the asynchrony for participants YI (left) and WR (right) for the different conditions. The dotted vertical lines indicate the exposed asynchrony. For the no exposure condition, the data points and the curves are plotted three times for each participant to facilitate comparison with the other exposure conditions. (b) Two-thirds thresholds for each participant and for the average across participants for the different conditions. The error bars correspond to the 95% CIs calculated according to Morey [18].
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4389610&req=5

RSPB20142833F2: Changes in sensitivity after exposure to asynchrony/synchrony. (a) Proportion of correct responses as a function of the asynchrony for participants YI (left) and WR (right) for the different conditions. The dotted vertical lines indicate the exposed asynchrony. For the no exposure condition, the data points and the curves are plotted three times for each participant to facilitate comparison with the other exposure conditions. (b) Two-thirds thresholds for each participant and for the average across participants for the different conditions. The error bars correspond to the 95% CIs calculated according to Morey [18].
Mentions: First, we describe the results for the participants who completed the largest number of trials (YI completed 11 820 trials and WR 11 880 trials, each taking approximately 35 h, see the electronic supplementary material, Methods). As expected, the proportion of correct identifications increased with asynchrony (figure 2a, black diamonds). Positive asynchronies indicate audio–visual pairs wherein the visual event leads the auditory event (VA asynchrony) and negative asynchronies indicate that the auditory event leads the visual event (AV asynchrony). Repeated exposure to VA asynchrony impaired the ability of participants to discriminate VA asynchronies, but improved their ability to discriminate AV asynchronies (figure 2a, bottom row, green triangles). Similarly, repeated exposure to AV asynchrony impaired discriminability of AV asynchronies, but improved discriminability of VA asynchronies (figure 2a, central row, blue circles). Lastly, repeated exposure to audio–visual synchrony improved discriminability of both VA and AV asynchronies (figure 2a, top row, red squares).Figure 2.

Bottom Line: Here, we show that the effect of recent experience on timing perception is not just subjective; recent sensory experience also modifies relative timing discrimination.This result indicates that recent sensory history alters the encoding of relative timing in sensory areas, excluding explanations of the subjective phenomenon based only on decision-level changes.The existence of these components would suggest that previous explanations of how recent experience may change the sensory encoding of timing, such as changes in sensory latencies or simple implementations of neural population codes, cannot account for the effect of sensory adaptation on timing perception.

View Article: PubMed Central - PubMed

Affiliation: NTT Communication Science Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morino-sato Wakamiya, Atsugi-shi, Kanagawa, 243-0198, Japan wjroseboom@gmail.com.

ABSTRACT
Recent sensory experience modifies subjective timing perception. For example, when visual events repeatedly lead auditory events, such as when the sound and video tracks of a movie are out of sync, subsequent vision-leads-audio presentations are reported as more simultaneous. This phenomenon could provide insights into the fundamental problem of how timing is represented in the brain, but the underlying mechanisms are poorly understood. Here, we show that the effect of recent experience on timing perception is not just subjective; recent sensory experience also modifies relative timing discrimination. This result indicates that recent sensory history alters the encoding of relative timing in sensory areas, excluding explanations of the subjective phenomenon based only on decision-level changes. The pattern of changes in timing discrimination suggests the existence of two sensory components, similar to those previously reported for visual spatial attributes: a lateral shift in the nonlinear transducer that maps relative timing into perceptual relative timing and an increase in transducer slope around the exposed timing. The existence of these components would suggest that previous explanations of how recent experience may change the sensory encoding of timing, such as changes in sensory latencies or simple implementations of neural population codes, cannot account for the effect of sensory adaptation on timing perception.

Show MeSH
Related in: MedlinePlus