May 2008
Volume 8, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   May 2008
How TMS and stimulus off/on signals modulate feature integration
Author Affiliations
  • Johannes Rüter
    Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
  • Frank Scharnowski
    Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
  • Thomas Kammer
    Department of Psychiatry, University of Ulm, Germany
  • Michael H. Herzog
    Laboratory of Psychophysics, Brain Mind Institute, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
Journal of Vision May 2008, Vol.8, 357. doi:10.1167/8.6.357
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      Johannes Rüter, Frank Scharnowski, Thomas Kammer, Michael H. Herzog; How TMS and stimulus off/on signals modulate feature integration. Journal of Vision 2008;8(6):357. doi: 10.1167/8.6.357.

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Abstract

When a right offset vernier is immediately followed by a left offset vernier (or vice versa), only one vernier is perceived. Feature fusion has occurred. In feature fusion, observers cannot resolve the two verniers individually. Subjects perform at chance level, if asked whether the first or second vernier is offset to the right. The perceived offset of the fused vernier is a combination of the offsets of the two presented verniers. To our surprise, the perceived offset can be systematically modulated by transcranial magnetic stimulation (TMS) applied over the occipital cortex. For an astonishing long period of 400ms, TMS enhances the contribution of the first or second vernier depending when TMS is applied. Thus, TMS can modulate feature integration for a long time but does not render the individual verniers visible. However, when the two verniers are separated by an interstimulus interval (ISI) of only 10ms, the verniers do become visible as single entities. Observers can discriminate whether the first or second vernier is offset to the right. Hence, feature fusion is interrupted. We postulate that the transient off/on signals due to the ISI render the verniers visible individually. On the other hand, single TMS pulses modulate but do not interrupt feature fusion.

Rüter, J. Scharnowski, F. Kammer, T. Herzog, M. H. (2008). How TMS and stimulus off/on signals modulate feature integration [Abstract]. Journal of Vision, 8(6):357, 357a, http://journalofvision.org/8/6/357/, doi:10.1167/8.6.357. [CrossRef]
Footnotes
 This research was supported by the SNF.
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