Motion direction biases and decoding in human visual cortex

Helena X. Wang, Elisha P. Merriam, Jeremy Freeman, David J. Heeger, Helena X. Wang, Elisha P. Merriam, David J. Heeger, Jeremy Freeman

Research output: Contribution to journalArticle

Abstract

Functional magnetic resonance imaging (fMRI) studies have relied on multivariate analysis methods to decode visual motion direction from measurements of cortical activity. Above-chance decoding has been commonly used to infer the motion-selective response properties of the underlying neural populations. Moreover, patterns of reliable response biases across voxels that underlie decoding have been interpreted to reflectmapsof functional architecture. Using fMRI,weidentified a direction-selective response bias inhumanvisual cortex that: (1) predicted motion-decoding accuracy; (2) depended on the shape of the stimulus aperture rather than the absolute direction of motion, such that response amplitudes gradually decreased with distance from the stimulus aperture edge corresponding to motion origin; and 3) was present in V1, V2, V3, but not evident inMT+, explaining the higher motion-decoding accuracies reported previously in early visual cortex. These results demonstrate that fMRI-based motion decoding has little or no dependence on the underlying functional organization of motion selectivity.

Original languageEnglish (US)
Pages (from-to)12601-12615
Number of pages15
JournalJournal of Neuroscience
Volume34
Issue number37
DOIs
StatePublished - Sep 10 2014

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Visual Cortex
Magnetic Resonance Imaging
Direction compound
Multivariate Analysis
Population

Keywords

  • Coarse-scale bias
  • Direction preference
  • FMRI
  • Motion decoding
  • Multivariate classification
  • Visual cortex

ASJC Scopus subject areas

  • Neuroscience(all)
  • Medicine(all)

Cite this

Wang, H. X., Merriam, E. P., Freeman, J., Heeger, D. J., Wang, H. X., Merriam, E. P., ... Freeman, J. (2014). Motion direction biases and decoding in human visual cortex. Journal of Neuroscience, 34(37), 12601-12615. https://doi.org/10.1523/JNEUROSCI.1034-14.2014

Motion direction biases and decoding in human visual cortex. / Wang, Helena X.; Merriam, Elisha P.; Freeman, Jeremy; Heeger, David J.; Wang, Helena X.; Merriam, Elisha P.; Heeger, David J.; Freeman, Jeremy.

In: Journal of Neuroscience, Vol. 34, No. 37, 10.09.2014, p. 12601-12615.

Research output: Contribution to journalArticle

Wang, HX, Merriam, EP, Freeman, J, Heeger, DJ, Wang, HX, Merriam, EP, Heeger, DJ & Freeman, J 2014, 'Motion direction biases and decoding in human visual cortex', Journal of Neuroscience, vol. 34, no. 37, pp. 12601-12615. https://doi.org/10.1523/JNEUROSCI.1034-14.2014
Wang HX, Merriam EP, Freeman J, Heeger DJ, Wang HX, Merriam EP et al. Motion direction biases and decoding in human visual cortex. Journal of Neuroscience. 2014 Sep 10;34(37):12601-12615. https://doi.org/10.1523/JNEUROSCI.1034-14.2014
Wang, Helena X. ; Merriam, Elisha P. ; Freeman, Jeremy ; Heeger, David J. ; Wang, Helena X. ; Merriam, Elisha P. ; Heeger, David J. ; Freeman, Jeremy. / Motion direction biases and decoding in human visual cortex. In: Journal of Neuroscience. 2014 ; Vol. 34, No. 37. pp. 12601-12615.
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