Relationship between the Dynamics of the Intrinsic Optical Signals and Orientation Selectivity in the Cat V2

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  • NAGAI Midori
    Graduate School of Science and Engineering, Kagoshima University Kagoshima National College of Technology
  • OKAMURA Jun-ya
    Graduate School of Science and Engineering, Kagoshima University
  • INOUE Yuta
    Faculty of Engineering, Kagoshima University
  • WANG Gang
    Graduate School of Science and Engineering, Kagoshima University

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Other Title
  • ネコ第二次視覚野における内因性光学的信号の時間的変化とその傾き方位の依存性
  • ネコ ダイ2ジ シカクヤ ニ オケル ナイインセイ コウガクテキ シンゴウ ノ ジカンテキ ヘンカ ト ソノ カタムキ ホウイ ノ イソンセイ

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Abstract

In the present study, we focused on the temporal information of the intrinsic optical signals in cat V2. The dynamic waveforms of the signals recorded in the visual cortical areas with different orientation selectivity were compared. The exposed visual cortical area was illuminated by the light with the wavelength of 605 ± 10 nm. Gratings were drifted at a velocity of 1.5 deg/s in the direction perpendicular to the grating orientations. The spatial frequency of the gratings was 0.5 cycles/deg. The orientations of the gratings were changed from horizontal (0 deg) to 157.5 deg with an interval of 22.5 deg. Each stimulus was presented 30 times. The response images were averaged over all the stimulus repetitions. Six hemispheres from three cats were used. In each of the optical patches with different orientation selectivity, time course of the intrinsic optical signal was examined, and the peak delay denoting as the time period from the stimulus onset to the time at which the intrinsic optical signal reached its maximum was measured. The delays responded to the stimuli of 0 deg and 90 deg gratings were 1.96 ± 0.26 s and 2.09 ± 0.38 s (mean ± SE, n = 6) in the cortical areas preferred to the orientations of 0 deg and 90 deg, respectively. In contrast, the delays responded to 45 deg and 135 deg gratings were 2.30 ± 0.21 s, and 2.21 ± 0.24 s in the cortical areas selectively responding to the gratings of 45 deg, and 135 deg orientations, respectively. The peak delays in the area with the preference of oblique orientations were statistically significant longer than those with the preference of cardinal orientations. The results may suggest a neuronal basis for the difference in the cognitive information processing between the oblique and the cardinal orientations.

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