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The Effect of Predictability on Subjective Duration, Vani Pariyadath ; David Eagleman| old_uid | 3617 |
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| title | The Effect of Predictability on Subjective Duration, Vani Pariyadath ; David Eagleman |
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| start_date | 2007/12/06 |
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| schedule | 16h |
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| online | no |
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| summary | Events can sometimes appear longer or shorter in duration than other
events of equal length. For example, in a repeated presentation of
auditory or visual stimuli, an unexpected object of equivalent
duration appears to last longer. Illusions of duration distortion beg
an important question of time representation: when durations dilate or
contract, does time in general slow down or speed up during that
moment? In other words, what entailments do duration distortions have
with respect to other timing judgments? We here show that when a sound
or visual flicker is presented in conjunction with an unexpected
visual stimulus, neither the pitch of the sound nor the frequency of
the flicker is affected by the apparent duration dilation. This
demonstrates that subjective time in general is not slowed; instead,
duration judgments can be manipulated with no concurrent impact on
other temporal judgments. Like spatial vision, time perception appears
to be underpinned by a collaboration of separate neural mechanisms
that usually work in concert but are separable. We further show that
the duration dilation of an unexpected stimulus is not enhanced by
increasing its saliency, suggesting that the effect is more closely
related to prediction violation than enhanced attention. Finally,
duration distortions induced by violations of progressive number
sequences implicate the involvement of high-level predictability,
suggesting the involvement of areas higher than primary visual cortex.
We suggest that duration distortions can be understood in terms of
repetition suppression, in which neural responses to repeated stimuli
are diminished.
PDF here (open access):
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0001264 |
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| responsibles | Cousineau, Barthelme |
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