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新学術領域研究質感脳情報学キックオフシンポジウムスライド 2010年9月25日土東京大学山上会館

高次元空間から実世界を見る視覚野細胞たち http://ohzawa-lab.bpe.es.osaka-u.

Graduate School of Frontier Biosciences Osaka

1 新学術領域研究質感脳情報学キックオフシンポジウムスライド 2010年9月25日土東京大学山上会館一部スライド図未発表データは著作権等のため削除してあります質感kickoff 高次元空間から実世界を見る視覚野細胞たち大澤五住 Izumi Ohzawa Visual Neuroscience Lab. Graduate School of Frontier Biosciences Osaka University 大阪大学大学院生命機能研究科脳神経工学講座視覚神経科学研究室

2 Methods / V1/V2: (spikes) TCP/UDP Socket Electrical Signal Display? Amplifiers and Filters

3 Reverse Correlation Spike-Triggered Average (STA) of stimuli Jones & Palmer 1987 Ohzawa et al. 1990, 1996 DeAngelis et al. 1993

4 Reverse Correlation Spike-Triggered Average (STA) of stimuli Jones & Palmer 1987 Ohzawa et al. 1990, 1996 DeAngelis et al. 1993

5 Receptive Fields and the Visual Pathway Brain and neurons+electrode images modified from: D.H. Hubel (1988) Eye, Brain, and Vision (V1)

6 V1 Collected in Ohzawa lab ON region OFF region Visual angle: 10 degs

7 V1 Collected in Ohzawa lab ON OFF 10

8 This movie is available separately at: ON OFF 10 Animation

9 Spatial Frequency Low High

11 Spatial Frequency Domain fy fx

Fourier http://ohzawa-lab.bpe.es.osaka-u.ac.

12 Fourier

13 (Fourier Transform) Einstein Einstein

14 V1 Wavelet. This movie is available separately at: ON OFF 10 Animation

15 G(x, y) = e Gabor, D (1946). Theory of communication. J. IEE 93: y Gabor Wavelet x 2 +y 2 2σ 2 cos(2πfx + φ) 2D_Gabor_demo/demo.html x Dennis Gabor Nobel Prize 1971 in Physics

Image removed due to copyright Supplementary Figure 2. Gabor wavelet pyramid design, in: Identifying natural images from human brain activity Kendrick N. Kay, Thomas Naselaris, Ryan J.

16 Image removed due to copyright Supplementary Figure 2. Gabor wavelet pyramid design, in: Identifying natural images from human brain activity Kendrick N. Kay, Thomas Naselaris, Ryan J. Prenger & Jack L. Gallant Nature 452, (20 March 2008) doi: /nature Main article: Kay/Gallant et al. 2008, Nature

17 V1 (X, Y) (SF, OR) 4 X Y OR SF

18 Texture Contrast 色平均輝度は同じだが... 模様の有無強弱が作る境界ざらざらつるつる

19 Surround Suppression Redrawn from Fig. 1 in: Walker, Ohzawa, Freeman Walker, Ohzawa, Freeman 1999

20 Envelope Carrier: Grating Envelope Similar to Fig. 1 in: Hiroki Tanaka and Izumi Ohzawa (2009) Envelope

21 V1 Surround Suppression Color version of Fig. 4 in: Hiroki Tanaka and Izumi Ohzawa (2009) Tanaka & Ohzawa, 2009

22 Surround Suppression (2009) Image removed due to copyright. The image is on the net at the URL below.

23 V1 Y X OR X Y Carrier Carrier Envelope SF Envelope

24 >>

25 // Collaborators and Colleagues, Minami Ito (NIPS Osakaki) : LSRC, TDRC in monkey V2, Kunihiro Asakawa (NIPS, Okazaki) Yuzo M. Chino (U. Houston): LSRC in amblyopic monkey V2, V3 Chantal Milleret (Collège de France): Callosal connections, Kota S. Sasaki (Assistant Prof.) : Binocular RF, Hiroki Tanaka (Assistant Prof.) : Surround Suppression, Shinji Nishimoto (UC Berkeley, Gallant Lab): LSRC, Takahisa Sanada (U. Rochester, DeAngelis Lab) : Binocular RF Other Ohzawa Lab Members: R. Kimura, T. Arai, Y. Tabuchi, Y. Asada, M. Fukui, T. Nakazono, T. Ninomiya, T. Ishida, M. Iida, M. Aoyama

26 ref info Thank you!!! ASCONE2009 Vol. 17, No. 3 (2010),

0A_SeibutsuJyoho-RF.ppt

0A_SeibutsuJyoho-RF.ppt A ON-Center OFF-Center DeAngelis, Ohzawa, Freeman 1995 Nobel Prize 1981: Physiology and Medicine D.H. Hubel and T.N. Wiesel T.N. Wiesel D.H. Hubel V1/V2: (spikes) Display? Amplifiers and Filters V1 - simple