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-2010-09-25 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.ac.jp 大澤五住 Izumi Ohzawa ohzawa@fbs.osaka-u.ac.jp 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
Methods / V1/V2: (spikes) TCP/UDP Socket Electrical Signal Display? Amplifiers and Filters
Reverse Correlation Spike-Triggered Average (STA) of stimuli Jones & Palmer 1987 Ohzawa et al. 1990, 1996 DeAngelis et al. 1993
Reverse Correlation Spike-Triggered Average (STA) of stimuli Jones & Palmer 1987 Ohzawa et al. 1990, 1996 DeAngelis et al. 1993
Receptive Fields and the Visual Pathway Brain and neurons+electrode images modified from: D.H. Hubel (1988) Eye, Brain, and Vision (V1)
V1 Collected in Ohzawa lab 2004-2009 ON region OFF region Visual angle: 10 degs
V1 Collected in Ohzawa lab 2004-2009 ON OFF 10
This movie is available separately at: http://ohzawa-lab.bpe.es.osaka-u.ac.jp/resources/pubmovies.html http://ohzawa-lab.bpe.es.osaka-u.ac.jp/resources/movies/rf/manygaborsatoneplace.mov ON OFF 10 Animation
Spatial Frequency Low High
Spatial Frequency Domain fy fx
Fourier http://ohzawa-lab.bpe.es.osaka-u.ac.jp/resources/movies/senri2009/fouriertransform-2d-a.mov http://www.youtube.com/watch?v=qb0cffzpw-a
(Fourier Transform) Einstein Einstein
V1 Wavelet. This movie is available separately at: http://ohzawa-lab.bpe.es.osaka-u.ac.jp/resources/pubmovies.html http://ohzawa-lab.bpe.es.osaka-u.ac.jp/resources/movies/rf/manygaborsatoneplace.mov ON OFF 10 Animation
G(x, y) = e Gabor, D (1946). Theory of communication. J. IEE 93:429 459. y Gabor Wavelet x 2 +y 2 2σ 2 cos(2πfx + φ) http://www.ee.hawaii.edu/~treed/ispg/ 2D_Gabor_demo/demo.html x Dennis Gabor Nobel Prize 1971 in Physics http://nobelprize.org/nobel_prizes/physics/laureates/1971/gabor-autobio.html
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, 352-355(20 March 2008) doi:10.1038/nature06713 http://www.nature.com/nature/journal/v452/n7185/suppinfo/nature06713.html Main article: http://www.nature.com/nature/journal/v452/n7185/full/nature06713.html Kay/Gallant et al. 2008, Nature
V1 (X, Y) (SF, OR) 4 X Y OR SF
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
Surround Suppression Redrawn from Fig. 1 in: Walker, Ohzawa, Freeman 1999 http://www.jneurosci.org/cgi/content/abstract/19/23/10536 Walker, Ohzawa, Freeman 1999
Envelope Carrier: Grating Envelope Similar to Fig. 1 in: Hiroki Tanaka and Izumi Ohzawa (2009) http://jn.physiology.org/cgi/content/abstract/101/3/1444 Envelope
V1 Surround Suppression Color version of Fig. 4 in: Hiroki Tanaka and Izumi Ohzawa (2009) http://jn.physiology.org/cgi/content/abstract/101/3/1444. Tanaka & Ohzawa, 2009
Surround Suppression (2009) Image removed due to copyright. The image is on the net at the URL below. http://www.shoarns.com/chapmans%20zebra%20web.jpg
V1 Y X OR X Y Carrier Carrier Envelope SF Envelope
1. 2. 3. >>
// 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
ref info Thank you!!! ASCONE2009 Vol. 17, No. 3 (2010), 146-153 http://ohzawa-lab.bpe.es.osaka-u.ac.jp
End Copyright 2010 Izumi Ohzawa & Ohzawa Lab., All Rights Reserved