08:30 - 10:00
Mon-H4-Talk 1--9
Mon-Talk 1
Room: H4
Chair/s:
Chhavi Sachdeva
Sensory attenuation of self-initiated tactile feedback is modulated by stimulus strength and temporal delay in a virtual reality environment
Mon-H4-Talk 1-905
Presented by: Fabian Kiepe
Fabian KiepeGuido Hesselmann
Psychologische Hochschule Berlin
Despite extensive research across different modalities, the precise mechanisms of sensory attenuation (SA) remain debated. Our study investigated the underlying mechanisms of SA in the tactile modality, specifically examining self-initiation and temporal predictions within a virtual reality (VR) environment. The VR setup allowed for precise control over sensory feedback in response to movement. Participants (N = 31) engaged in an active condition, moving their hands to elicit a touch. Importantly, visual perception was modified in VR, so that participants touched their rendered – but not physical – hands. The virtual touch triggered a test vibration (intensity: 0.2, 0.35, 0.5, 0.65, 0.8, in a.u.) on the Meta Quest 2 touch controllers. Participants compared the test vibration to a standard stimulus (intensity: 0.5). In the passive condition, vibrations were presented without movement and were preceded by a visual cue. Further, test vibrations appeared either immediately or after a variable onset delay (700 - 800ms). Our results revealed a shift in the point of subjective equality (PSE) – the point at which the test stimulus is perceived as equivalent in intensity to the standard stimulus – depending on whether the stimuli were self-initiated or externally generated. This attenuation effect was most pronounced when self-initiated vibrations were of higher intensity 0.65, 0.8) and occurred immediately after the movement. Our findings highlight the importance of self-initiation on sensory attenuation. Further, the results suggest adaptiveness in the perceived intensity of self-initiated sensory input, with attenuation effects modulated by contextual factors such as signal strength and temporality.
Keywords: Sensory Attenuation, Perception, Tactile Modality, Virtual Reality