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Somatosensory interactions reveal feature-dependent computations.

08:00 EDT 10th April 2019 | BioPortfolio

Summary of "Somatosensory interactions reveal feature-dependent computations."

Our ability to perceive and discriminate textures is based on the processing of high-frequency vibrations generated on the fingertip as it is scanned across a surface. Although much is known about the processing of vibration amplitude and frequency information when cutaneous stimulation is experienced at a single location on the body, how these stimulus features are processed when touch occurs at multiple locations is poorly understood. We evaluated participants ability to discriminate tactile cues on one hand while they ignored distractor cues experienced on their other hand. We manipulated the relative positions of the hands to characterize how limb position influenced cutaneous touch interactions. In separate experiments, participants judged either the frequency or intensity of mechanical vibrations. We found that vibrations experienced on one hand always systematically modulated the perception of vibrations on the other hand. Notably, bimanual interaction patterns and their sensitivity to hand locations differed according to stimulus feature. Somatosensory interactions in intensity perception were only marked by attenuation that was invariant to hand position manipulations. In contrast, interactions in frequency perception consisted of both bias and sensitivity changes that were more pronounced when the hands were held in close proximity. We implemented models to infer the neural computations that mediate somatosensory interactions in the intensity and frequency dimensions. Our findings reveal obligatory and feature-dependent somatosensory interactions that may be supported by both feature-specific and feature-general operations.

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Journal Details

This article was published in the following journal.

Name: Journal of neurophysiology
ISSN: 1522-1598
Pages:

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