|Congruent and opposite neurons in multisensory or multi-modality cortical areas arise from efficient coding of sensory inputs|
Many medial superior temporal (MST) neurons are tuned to heading direction of self-motion based on optic flow or vestibular inputs. The preferred directions from different senses within a single neuron can be congruent (matched) or opposite from each other (Gu, Angelaki, DeAngelis 2008). Similarly, neurons in middle temporal (MT) cortex are tuned to depth based on binocular disparity or motion parallax, and the preferred depths from different modalites can also be congruent or opposite (Nadler et al 2013). These are examples of neuron in the brain that respond to inputs from multiple sensory modalities, e.g., vision, audition, and touch, or from multiple unisensory cues. While the congruently tuned neurons appear natural for the functional role of cue integration, the oppositely tuned neurons appear somewhat puzzling. I propose that, together, congruent and opposite cells in a neural population achieve efficient coding given incomplete redundancy in the input sources (Barlow, 1961). Efficiency requires creating representations (also called bases) in which the inputs are decorrelated. For two sources, this implies two bases in which inputs that sample the features from the two sources are either (weighted and) added or (weighted and) subtracted; these are the genesis respectively of congruently and oppositely tuned cells.
|作者单位||Beijing Normal University/University College London|
|Li Zhaoping. Congruent and opposite neurons in multisensory or multi-modality cortical areas arise from efficient coding of sensory inputs[C],2017.|