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Different Stimuli, Different Spatial Codes: A Visual Map and an Auditory Rate Code for Oculomotor Space in the Primate Superior Colliculus

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  • Jungah Lee
  • Jennifer M Groh

Abstract

Maps are a mainstay of visual, somatosensory, and motor coding in many species. However, auditory maps of space have not been reported in the primate brain. Instead, recent studies have suggested that sound location may be encoded via broadly responsive neurons whose firing rates vary roughly proportionately with sound azimuth. Within frontal space, maps and such rate codes involve different response patterns at the level of individual neurons. Maps consist of neurons exhibiting circumscribed receptive fields, whereas rate codes involve open-ended response patterns that peak in the periphery. This coding format discrepancy therefore poses a potential problem for brain regions responsible for representing both visual and auditory information. Here, we investigated the coding of auditory space in the primate superior colliculus(SC), a structure known to contain visual and oculomotor maps for guiding saccades. We report that, for visual stimuli, neurons showed circumscribed receptive fields consistent with a map, but for auditory stimuli, they had open-ended response patterns consistent with a rate or level-of-activity code for location. The discrepant response patterns were not segregated into different neural populations but occurred in the same neurons. We show that a read-out algorithm in which the site and level of SC activity both contribute to the computation of stimulus location is successful at evaluating the discrepant visual and auditory codes, and can account for subtle but systematic differences in the accuracy of auditory compared to visual saccades. This suggests that a given population of neurons can use different codes to support appropriate multimodal behavior.

Suggested Citation

  • Jungah Lee & Jennifer M Groh, 2014. "Different Stimuli, Different Spatial Codes: A Visual Map and an Auditory Rate Code for Oculomotor Space in the Primate Superior Colliculus," PLOS ONE, Public Library of Science, vol. 9(1), pages 1-14, January.
  • Handle: RePEc:plo:pone00:0085017
    DOI: 10.1371/journal.pone.0085017
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    References listed on IDEAS

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    1. H H L M Goossens & A J van Opstal, 2012. "Optimal Control of Saccades by Spatial-Temporal Activity Patterns in the Monkey Superior Colliculus," PLOS Computational Biology, Public Library of Science, vol. 8(5), pages 1-18, May.
    2. Antje Brand & Oliver Behrend & Torsten Marquardt & David McAlpine & Benedikt Grothe, 2002. "Precise inhibition is essential for microsecond interaural time difference coding," Nature, Nature, vol. 417(6888), pages 543-547, May.
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