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Directional biases in whole hand motion perception revealed by mid-air tactile stimulation

Perquin, Marlou N., Taylor, Mason, Lorusso, Jarred and Kolasinski, James 2021. Directional biases in whole hand motion perception revealed by mid-air tactile stimulation. Cortex 142 , pp. 221-236. 10.1016/j.cortex.2021.03.033

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Abstract

Many emerging technologies are attempting to leverage the tactile domain to convey complex spatiotemporal information translated directly from the visual domain, such as shape and motion. Despite the intuitive appeal of touch for communication, we do not know to what extent the hand can substitute for the retina in this way. Here we ask whether the tactile system can be used to perceive complex whole hand motion stimuli, and whether it exhibits the same kind of established perceptual biases as reported in the visual domain. Using ultrasound stimulation, we were able to project complex moving dot percepts onto the palm in mid-air, over 30cm above an emitter device. We generated dot kinetogram stimuli involving motion in three different directional axes (‘Horizontal’, ‘Vertical’, and ‘Oblique’) on the ventral surface of the hand. Using Bayesian modelling, we found clear evidence that participants were able to discriminate tactile motion direction. Furthermore, there was a marked directional bias in motion perception: participants were both better and more confident at discriminating motion in the vertical and horizontal axes of the hand, compared to those stimuli moving obliquely. This pattern directly mirrors the perceptional biases that have been robustly reported in the visual field, termed the ‘Oblique Effect’. These data demonstrate the existence of biases in motion perception that transcend sensory modality. Furthermore, we extend the Oblique Effect to a whole hand scale, using motion stimuli presented on the broad and relatively low acuity surface of the palm, away from the densely innervated and much studied fingertips. These findings highlight targeted ultrasound stimulation as a versatile method to convey potentially complex spatial and temporal information without the need for a user to wear or touch a device.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Cardiff University Brain Research Imaging Centre (CUBRIC)
Additional Information: This is an open access article under the CC BY license (http://creativecommons. org/licenses/by/4.0/)
Publisher: Elsevier
ISSN: 0010-9452
Funders: Wellcome Trust
Date of First Compliant Deposit: 30 March 2021
Date of Acceptance: 30 March 2021
Last Modified: 21 Jul 2021 12:54
URI: http://orca.cardiff.ac.uk/id/eprint/140198

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