Investigating misperceptions of visuotactile information, somatosensory amplification and illusory tactile sensationsTools Lakhlani, Vrushant (2019) Investigating misperceptions of visuotactile information, somatosensory amplification and illusory tactile sensations. PhD thesis, University of Nottingham.
AbstractThis thesis investigated the underlying mechanisms of illusory tactile sensations that are generated by visuotactile cross-modal manipulations in healthy individuals using the Somatic Signal Detection Task (SSDT) as well as a modified version of the task known as Somatic Signal Discrimination Task (SSDiT). To investigate how the presence of light can result in an illusory report of tactile intensity (i.e., False Alarms), a series of behavioural experiments were conducted using the SSDT and SSDiT paradigms. Further experiments measured the underlying neural processing using EEG and MIRAGE augmented reality system. Behavioural findings indicate that simultaneous presentation of light with a tactile pulse created an illusory tactile enhancement effect (greater false alarms). EEG results indicate that there are two underlying mechanisms that are present during the SSDiT, an early sensory mechanism (EEG components P120 and P160) and a later discrimination mechanism (P360 and P400). Additionally, the SSDiT MIRAGE investigation found that participants were affected by bottom-up visual information they perceived, as fewer false alarms were observed during light present trials during the visual manipulated conditions (no sight and pixilated view). This implies that the level of external focus participants have can affect their susceptibility to experience these illusory sensations; more specifically, bottom-up sensory information can be affected by top-down expectations.
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