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Timing Rhythms: Perceived Duration Increases with a Predictable Temporal Structure of Short Interval Fillers.

Horr NK, Di Luca M - PLoS ONE (2015)

Bottom Line: One account to explain effects of temporal structure is a non-linear accumulator-counter mechanism reset at the beginning of every subinterval.No general over- or underestimation is registered for rhythmically grouped compared to isochronous intervals.Implications of these findings for a non-linear clock model as well as a neural response magnitude account of perceived duration are discussed.

View Article: PubMed Central - PubMed

Affiliation: Centre for Computational Neuroscience and Cognitive Robotics, Department of Psychology, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.

ABSTRACT
Variations in the temporal structure of an interval can lead to remarkable differences in perceived duration. For example, it has previously been shown that isochronous intervals, that is, intervals filled with temporally regular stimuli, are perceived to last longer than intervals left empty or filled with randomly timed stimuli. Characterizing the extent of such distortions is crucial to understanding how duration perception works. One account to explain effects of temporal structure is a non-linear accumulator-counter mechanism reset at the beginning of every subinterval. An alternative explanation based on entrainment to regular stimulation posits that the neural response to each filler stimulus in an isochronous sequence is amplified and a higher neural response may lead to an overestimation of duration. If entrainment is the key that generates response amplification and the distortions in perceived duration, then any form of predictability in the temporal structure of interval fillers should lead to the perception of an interval that lasts longer than a randomly filled one. The present experiments confirm that intervals filled with fully predictable rhythmically grouped stimuli lead to longer perceived duration than anisochronous intervals. No general over- or underestimation is registered for rhythmically grouped compared to isochronous intervals. However, we find that the number of stimuli in each group composing the rhythm also influences perceived duration. Implications of these findings for a non-linear clock model as well as a neural response magnitude account of perceived duration are discussed.

No MeSH data available.


Related in: MedlinePlus

Experimental Task in Experiment 2.Intervals compared in Experiment 2 displayed for two intervals of equal duration. Each rhythmic interval was compared to an isochronous interval. The number of tones was always equal for the two intervals compared and their order was counterbalanced.
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pone.0141018.g003: Experimental Task in Experiment 2.Intervals compared in Experiment 2 displayed for two intervals of equal duration. Each rhythmic interval was compared to an isochronous interval. The number of tones was always equal for the two intervals compared and their order was counterbalanced.

Mentions: Twenty-four new volunteers (12 female, 21.3±2.4years) participated in Experiment 2. Experimental procedure and ethical guidelines were similar as in Experiment 1. Experiment 2 differed from Experiment 1 only in the replacement of random intervals by isochronous intervals. That is, in every trial one rhythmic interval was compared to one isochronous interval. Again the experiment consisted of 6 blocks defined by the six rhythmic patterns. Task and interval structures are displayed in Fig 3. Participants made 336 duration discrimination judgments, with 56 trials per block, that is, 56 trials comparing a specific type of rhythm to an isochronous interval with the same number of stimuli.


Timing Rhythms: Perceived Duration Increases with a Predictable Temporal Structure of Short Interval Fillers.

Horr NK, Di Luca M - PLoS ONE (2015)

Experimental Task in Experiment 2.Intervals compared in Experiment 2 displayed for two intervals of equal duration. Each rhythmic interval was compared to an isochronous interval. The number of tones was always equal for the two intervals compared and their order was counterbalanced.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4608791&req=5

pone.0141018.g003: Experimental Task in Experiment 2.Intervals compared in Experiment 2 displayed for two intervals of equal duration. Each rhythmic interval was compared to an isochronous interval. The number of tones was always equal for the two intervals compared and their order was counterbalanced.
Mentions: Twenty-four new volunteers (12 female, 21.3±2.4years) participated in Experiment 2. Experimental procedure and ethical guidelines were similar as in Experiment 1. Experiment 2 differed from Experiment 1 only in the replacement of random intervals by isochronous intervals. That is, in every trial one rhythmic interval was compared to one isochronous interval. Again the experiment consisted of 6 blocks defined by the six rhythmic patterns. Task and interval structures are displayed in Fig 3. Participants made 336 duration discrimination judgments, with 56 trials per block, that is, 56 trials comparing a specific type of rhythm to an isochronous interval with the same number of stimuli.

Bottom Line: One account to explain effects of temporal structure is a non-linear accumulator-counter mechanism reset at the beginning of every subinterval.No general over- or underestimation is registered for rhythmically grouped compared to isochronous intervals.Implications of these findings for a non-linear clock model as well as a neural response magnitude account of perceived duration are discussed.

View Article: PubMed Central - PubMed

Affiliation: Centre for Computational Neuroscience and Cognitive Robotics, Department of Psychology, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.

ABSTRACT
Variations in the temporal structure of an interval can lead to remarkable differences in perceived duration. For example, it has previously been shown that isochronous intervals, that is, intervals filled with temporally regular stimuli, are perceived to last longer than intervals left empty or filled with randomly timed stimuli. Characterizing the extent of such distortions is crucial to understanding how duration perception works. One account to explain effects of temporal structure is a non-linear accumulator-counter mechanism reset at the beginning of every subinterval. An alternative explanation based on entrainment to regular stimulation posits that the neural response to each filler stimulus in an isochronous sequence is amplified and a higher neural response may lead to an overestimation of duration. If entrainment is the key that generates response amplification and the distortions in perceived duration, then any form of predictability in the temporal structure of interval fillers should lead to the perception of an interval that lasts longer than a randomly filled one. The present experiments confirm that intervals filled with fully predictable rhythmically grouped stimuli lead to longer perceived duration than anisochronous intervals. No general over- or underestimation is registered for rhythmically grouped compared to isochronous intervals. However, we find that the number of stimuli in each group composing the rhythm also influences perceived duration. Implications of these findings for a non-linear clock model as well as a neural response magnitude account of perceived duration are discussed.

No MeSH data available.


Related in: MedlinePlus