June 2006
Volume 6, Issue 6
Free
Vision Sciences Society Annual Meeting Abstract  |   June 2006
Hemodynamic changes in visual motion detection measured by near infrared spectroscopy
Author Affiliations
  • Masamitsu Harasawa
    Japan Broadcasting Corporation, and The University of Tokyo
  • Akiko Obata
    Advanced Research Laboratory, Hitachi Ltd
  • Toshiya Morita
    NHK Engineering Services
  • Takayuki Ito
    Japan Broadcasting Corporation
  • Takahiro Saito
    Kanagawa University
  • Takao Sato
    The University of Tokyo
  • Kiyoharu Aizawa
    The University of Tokyo
Journal of Vision June 2006, Vol.6, 572. doi:10.1167/6.6.572
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      Masamitsu Harasawa, Akiko Obata, Toshiya Morita, Takayuki Ito, Takahiro Saito, Takao Sato, Kiyoharu Aizawa; Hemodynamic changes in visual motion detection measured by near infrared spectroscopy. Journal of Vision 2006;6(6):572. doi: 10.1167/6.6.572.

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

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Abstract

Optical topography (OT) is an apparatus to measure cortical hemodynamic changes using near infrared spectroscopy and can be handled and maintained much more easily than fMRI, MEG and PET. However, there are few previous studies on relationship between OT signal and early visual processing. We investigated effects of motion signal intensity on OT signal, and suggested the usefulness of OT for vision sciences. Method: 100 white dots were randomly positioned within a 9.4° circular aperture in left visual hemifield. All dots moved in random direction with lifetime of 30 ms. Several seconds after the onset of random motion, a fraction (0, 20, 40 or 80%) of dots moved leftward or rightward coherently for 3 sec, and subsequently all dots disappeared. Participants pressed a button with their right hands as quickly as possible if they detected coherent motion. Hemoglobin concentrations were detected by an optical topography (Hitachi Medical Systems, ETG-100) every 0.1 sec at 24 measurement points. We positioned them on left and right side of participants' inions and repeated measurements at least 100 times for every condition. Results and Discussion: OT signals induced by coherent motion were obtained as differences of hemoglobin concentrations between “hit” and “correct rejection” trials. For every participant the higher motion signal intensity induced the shorter behavioral reaction time and the higher OT signals in right hemisphere. Our results indicated the relationship among stimulus intensity, behavioral response and hemodynamic response, and suggested the usefulness of this newly emerging apparatus.

Harasawa, M. Obata, A. Morita, T. Ito, T. Saito, T. Sato, T. Aizawa, K. (2006). Hemodynamic changes in visual motion detection measured by near infrared spectroscopy [Abstract]. Journal of Vision, 6(6):572, 572a, http://journalofvision.org/6/6/572/, doi:10.1167/6.6.572. [CrossRef]
Footnotes
 Supported by Japanese Ministry of Internal Affairs and Communications.
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