Distinct neural signatures of multimodal resizing illusions

Hansford, Kirralise; Baker, Daniel H.; McKenzie, Kirsten; Preston, Catherine

doi:10.1016/j.neuropsychologia.2023.108622

Cited by 4 publications

(9 citation statements)

References 41 publications

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“…The findings from the present study serve to enhance our understanding of the conditions under which these manipulations can affect the personal experience of such illusions. Previously, we have demonstrated that around 30% of participants experience effective resizing illusions via a unimodal visual condition (Hansford et al, 2023). Here, we show that subjective illusion strength during the unimodal visual presentation of finger stretching can be increased through the addition of a simultaneous nonnaturalistic auditory input.…”

Section: Discussionsupporting

confidence: 55%

“…It is, therefore, possible that when using these resizing illusions for the treatment of chronic pain, it may be beneficial to include non-naturalistic auditory input to increase the subjective illusion strength for patients during the illusion, and consequently, potentially increase attenuation of pain. The unimodal visual condition has been suggested as the most accessible version of resizing illusions (Hansford et al, 2023) as it has the potential to be delivered via a mobile phone application without the need for a researcher to add tactile inputs to the illusion. The incorporation of auditory inputs would not require the presence of a researcher either, and therefore, is a potential method to utilise multisensory integration during unimodal visual applications of these illusions to increase subjective illusion strength, which could in turn increase the analgesic effect of these illusions in a chronic pain sample.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to visual and tactile illusions, the combination of visual and proprioceptive, or, visual and motor inputs, has also been found to elicit body resizing illusions, with research demonstrating that proprioceptively aligning a child avatar body with a participant's adult body can elicit a strong illusion of having a smaller child-sized body (Banakou, Groten & Slater, 2013) and further research showing similarly that synchronous movements of an avatar with an elongated arm influences participants' judgements of arm length (Kilteni et al, 2012). Furthermore, tasks using combined visuotactile inputs have been compared to those employing unimodal visual inputs for finger stretching illusions, with participants reporting greater subjective embodiment of the illusion during the combined visuotactile stimulation than during the unimodal visual illusions (Hansford et al, 2023). Such findings serve to highlight the importance of multisensory integration for subjective embodiment during illusory changes in finger length.…”

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Multisensory Integration and Proprioceptive Drift During Resizing Illusions

Hansford¹,

Baker²,

McKenzie³

et al. 2023

Preprint

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Bodily resizing illusions typically use visual and/or tactile inputs to produce a vivid experience of one’s body changing size. Naturalistic auditory input (input that reflects the natural sounds of a stimulus) has been used to increase illusory experience during the rubber hand illusion, whilst non-naturalistic auditory input can influence estimations of finger length. We aimed to use non-naturalistic auditory input during a hand-based resizing illusion using augmented reality, to assess whether the addition of auditory input would increase both subjective illusion strength and measures of performance-based tasks. 44 participants completed three conditions: no finger stretching, finger stretching without tactile feedback, and finger stretching with tactile feedback. Half the participants had auditory input throughout all conditions, while the other half did not. After each condition, participants were given one of three performance tasks: stimulated (right) hand dot touch task, non-stimulated (left) hand dot touch task and a ruler judgement task. Dot tasks involved participants reaching for the location of a virtual dot, whereas the ruler task concerned estimates of the participant’s own finger on a ruler whilst the hand was hidden from view. After all trials, participants completed a questionnaire capturing subjective illusion strength. The addition of auditory input increased subjective illusion strength for manipulations without tactile feedback but not those with tactile feedback. No facilitatory effects of audio were found for any performance task. We, therefore, conclude that adding auditory input to illusory finger stretching increased subjective illusory experience in the absence of tactile feedback but did not affect performance-based measures.

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Section: Discussionsupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Multisensory Integration and Proprioceptive Drift During Resizing Illusions

Hansford¹,

Baker²,

McKenzie³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…The findings from the present study serve to enhance our understanding of the conditions under which these manipulations can affect the personal experience of such illusions. Previously, we have demonstrated that around 30% of participants experience effective resizing illusions via a unimodal visual condition (Hansford et al 2023 ). Here, we show that subjective illusion strength during the unimodal visual presentation of finger stretching can be increased through the addition of a simultaneous non-naturalistic auditory input.…”

Section: Discussionmentioning

confidence: 91%

“…Further research also similarly shows that synchronous movements of an avatar with an elongated arm influence participants’ judgements of arm length (Kilteni et al 2012 ). Furthermore, tasks using combined visuotactile inputs have been compared to those employing unimodal visual inputs for finger-stretching illusions, with participants reporting greater subjective embodiment of the illusion during combined visuotactile stimulation than that during unimodal visual illusions (Hansford et al 2023 ). Such findings serve to highlight the importance of multisensory processing for subjective embodiment during illusory changes in finger length.…”

Section: Introductionmentioning

confidence: 99%

Multisensory processing and proprioceptive plasticity during resizing illusions

Hansford,

Baker,

McKenzie

et al. 2024

Exp Brain Res

Self Cite

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Bodily resizing illusions typically use visual and/or tactile inputs to produce a vivid experience of one’s body changing size. Naturalistic auditory input (an input that reflects the natural sounds of a stimulus) has been used to increase illusory experience during the rubber hand illusion, whilst non-naturalistic auditory input can influence estimations of finger length. We aimed to use a non-naturalistic auditory input during a hand-based resizing illusion using augmented reality, to assess whether the addition of an auditory input would increase both subjective illusion strength and measures of performance-based tasks. Forty-four participants completed the following three conditions: no finger stretching, finger stretching without tactile feedback and finger stretching with tactile feedback. Half of the participants had an auditory input throughout all the conditions, whilst the other half did not. After each condition, the participants were given one of the following three performance tasks: stimulated (right) hand dot touch task, non-stimulated (left) hand dot touch task, and a ruler judgement task. Dot tasks involved participants reaching for the location of a virtual dot, whereas the ruler task concerned estimates of the participant’s own finger on a ruler whilst the hand was hidden from view. After all trials, the participants completed a questionnaire capturing subjective illusion strength. The addition of auditory input increased subjective illusion strength for manipulations without tactile feedback but not those with tactile feedback. No facilitatory effects of audio were found for any performance task. We conclude that adding auditory input to illusory finger stretching increased subjective illusory experience in the absence of tactile feedback but did not affect performance-based measures.

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Illusory deformation of the finger is more extensive in the distal than the lateral direction

Sato,

Saito,

Kodaka

2024

i-Perception

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Previous studies have examined the rubber hand illusion with finger lengthening, but there is limited research on finger widening. This suggests a strong cognitive bias toward the illusory expansion of the finger in a distal direction rather than lateral. To test this, we compared the illusory deformability of the finger in the distal and lateral directions through the generation of illusory finger deformation using a double-touch operation, referred to as the numbness illusion. Our results showed that perceived distal distortion was wholly superior to perceived lateral distortion in terms of sense of ownership ratings. Moreover, the extent of the perceived deformation was greater in the distal than lateral direction, supporting our hypothesis that there is a distal bias. We suggest that this preference may be because the presence of multiple joints is required to create illusory deformation in the target direction.

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Distinct neural signatures of multimodal resizing illusions

Cited by 4 publications

References 41 publications

Multisensory Integration and Proprioceptive Drift During Resizing Illusions

Multisensory Integration and Proprioceptive Drift During Resizing Illusions

Multisensory processing and proprioceptive plasticity during resizing illusions

Illusory deformation of the finger is more extensive in the distal than the lateral direction

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