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Neuron. 2018 Feb 7;97(3):626-639.e8. doi: 10.1016/j.neuron.2018.01.003. Epub 2018 Jan 27.

Supralinear and Supramodal Integration of Visual and Tactile Signals in Rats: Psychophysics and Neuronal Mechanisms.

Author information

1
Tactile Perception and Learning Lab, International School for Advanced Studies (SISSA), Via Bonomea 265, Trieste, TS 34136, Italy.
2
Visual Neuroscience Lab, International School for Advanced Studies (SISSA), Via Bonomea 265, Trieste, TS 34136, Italy.
3
Tactile Perception and Learning Lab, International School for Advanced Studies (SISSA), Via Bonomea 265, Trieste, TS 34136, Italy. Electronic address: diamond@sissa.it.

Abstract

To better understand how object recognition can be triggered independently of the sensory channel through which information is acquired, we devised a task in which rats judged the orientation of a raised, black and white grating. They learned to recognize two categories of orientation: 0° ± 45° ("horizontal") and 90° ± 45° ("vertical"). Each trial required a visual (V), a tactile (T), or a visual-tactile (VT) discrimination; VT performance was better than that predicted by optimal linear combination of V and T signals, indicating synergy between sensory channels. We examined posterior parietal cortex (PPC) and uncovered key neuronal correlates of the behavioral findings: PPC carried both graded information about object orientation and categorical information about the rat's upcoming choice; single neurons exhibited identical responses under the three modality conditions. Finally, a linear classifier of neuronal population firing replicated the behavioral findings. Taken together, these findings suggest that PPC is involved in the supramodal processing of shape.

KEYWORDS:

Bayesian; linearity; multimodal integration; mutual information; neuronal coding; posterior parietal cortex; psychophysics; rat; touch; vision

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