Macquarie University
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Do visual body-ownership cues modulate visuo-tactile temporal order judgements?: An investigation in non-synaesthetes and mirror-touch synaesthetes

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posted on 2022-03-28, 14:56 authored by Sophie Smit
To accurately perceive oneself in a complex multisensory environment, the brain has to determine which unimodal signals originated from its own body and should therefore be integrated. It is currently debated if visual body-ownership cues such as object form and orientation interact, and if visual plausibility increases the effects of various multisensory signals being integrated. In this thesis, I investigated the effects of visual body-ownership cues on visuo-tactile temporal perception in both non-synaesthetes and mirror-touch synaesthetes using a temporal order judgement (TOJ) task. Each participant viewed videos of a touch being applied to visual stimuli that were either plausible or implausible for his or her right hand (hand oriented plausibly, hand rotated 180 degrees, sponge). On each trial, a touch was also applied to the participant's own hand at varying stimulus onset asynchronies (SOAs) relative to the visual touch. Participants judged which stimulus came first: viewed or felt touch. I tested whether visual body-ownership cues affect temporal binding and the size of the temporal interval between visual and tactile stimuli participants can reliably notice ('just noticeable difference' - JND). Bayesian analyses revealed that plausibility of object form and orientation do not affect visuo-tactile temporal perception in either non-synaesthetes or mirror-touch synaesthetes. I discuss the implications of these findings in relation to understanding body perception and mirror-touch synaesthesia.


Table of Contents

Chapter 1: Introduction -- Chapter 2: The effect of viewing touch to a hand on visua-tactile temporal order judgements in non-synthaesthetes (Experiment 1) -- Chapter 3: The effect of viewing touch to a hand on visua-tactile temporal order judgements in mirror-touch synthaesthates (Experiment 2) -- Chapter 4: General discussion.


Theoretical thesis. Bibliography: pages 61-70

Awarding Institution

Macquarie University

Degree Type

Thesis MRes


MRes, Macquarie University, Faculty of Human Science, Department of Cognitive Science

Department, Centre or School

Department of Cognitive Science

Year of Award


Principal Supervisor

Regine Zopf

Additional Supervisor 1

Anina N. Rich


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