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Physical, explicit and implicit time in a temporal order judgement task
KTH, School of Biotechnology (BIO).
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Fysisk, explicit och implicit tid i en temporal ordningsbestämningsuppgift (Swedish)
Abstract [en]

Time is both a cognitive construct and a property of neural processing. The distinctions have to be made between the physical time used in Newtonian Physics and measure by watches, the (neural) implicit time and the explicit (perceived) time. This present study first interrogates where and how physical time information is processed, or in other words, what is the link between physical time and implicit time, and second, what is the link between explicit and implicit time. A magneto encephalography (MEG) psychochysics experiment involving aduiovisual pair of stimuli with different inter-stimulus (ISI) intervals and a temporal order judgment task was performed. It is shown that vision modulates auditory responses and that the amplitude of the modulation in auditory cortex is correlated with the ISI. The explicit time estimated by the point of subjective simultaneity (PSS) is correlated with the latency of the auditory response. These findings suggests that spatial information is forts processed by the visual cortex, which then provides a framework in which auditory information processing can anchor. The auditory cortex would act as an accumulator of evidence, triggered either by an auditory stimulus or by a signal carrying information of a visual stimulation.

Place, publisher, year, edition, pages
Keyword [en]
Neuroscience, neuroimaging, magnetoencephalography, evoked-related fields, auditory cortex, visual corex, simultaneity, time perception, multisensory
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-149666OAI: diva2:744704
Available from: 2015-04-17 Created: 2014-08-25 Last updated: 2015-09-18Bibliographically approved

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