May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
The role of hMST in the perception of object movement during self-movement
Author Affiliations
  • Simon Rushton
    School of Psychology, Cardiff University, Wales
  • Petroc Sumner
    School of Psychology, Cardiff University, Wales
  • Krish Singh
    School of Psychology, Cardiff University, Wales
Journal of Vision May 2008, Vol.8, 126. doi:10.1167/8.6.126
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      Simon Rushton, Petroc Sumner, Krish Singh; The role of hMST in the perception of object movement during self-movement. Journal of Vision 2008;8(6):126. doi: 10.1167/8.6.126.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Neurophysiological research (Eifuku & Wurtz, 1998, Journal of Neurophysiology) has identified MST as a potential site for the detection of scene-relative movement. Using fMRI we investigated the role of area hMST in the same task in humans. First using standard localisers we identified hMT+, hMST and hMT, along with disparity sensitive, motion sensitive, and retinotopic regions. Next we confirmed that pure object movement (a moving object viewed from a stationary viewpoint) activated the same network of motion-sensitive areas as pure self-movement (movement of a viewpoint through a rigid scene). We then attempted to isolate areas specialised for scene-relative movement. Observers viewed (through anaglyph stereo glasses) twenty-five 3D objects randomly positioned within a volume in peripersonal space, directly ahead. Amongst the scene objects was a target object that was identified by a significant difference in size. We simulated the lateral translation of the observer and a compensatory counter-rotation of the head to maintain fixation on the centre of the volume of objects. We compared BOLD response (15 second period box-car) when the target object was a part of the rigid scene against when the target object moved independently of the scene. There was some variation in individuals' responses, but the results suggest a central role for hMST.

Rushton, S. Sumner, P. Singh, K. (2008). The role of hMST in the perception of object movement during self-movement [Abstract]. Journal of Vision, 8(6):126, 126a, http://journalofvision.org/8/6/126/, doi:10.1167/8.6.126. [CrossRef]
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