Ch. 1. How could populations of neurons encode information

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Presentation transcript:

Ch. 1. How could populations of neurons encode information Ch. 1 How could populations of neurons encode information? Christian Hölscher 2008/12/17 B.-W. Ku

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Summary Multi-electrode array recording (scale ↑, resolution ↑) Questions How do different brain areas interact when processing information? How do neuronal populations encode information? How are networks formed and separated from or associated with other networks? Coding schemes Frequency coding Phase coding Population coding Encoding of sequences and of time Binding problem (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

Multi-electrode Array Recording Single-cell recording (scale ↓) PET scan (resolution ↓) Multi-electrode array recording (scale ↑, resolution ↑) Groups of single-cell activity Local field potential(LPF) (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Questions How do different brain areas interact when processing information? How do neuronal populations encode information? How are networks formed and separated from or associated with other networks? EEG field potential oscillation (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

A Brief Overview of Current Ideas on Coding Schemes

Frequency Coding (rate coding) Temperature, pressure Amplitude of sound wave (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Phase Coding (1) Pressure changes in skin receptors (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Phase Coding (2) Place cells in the hippocampus Synchronous activity (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Population Coding (1) Group of neurons Group of columns (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Population Coding (2) A wide range of information (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

Encoding of Sequences and of Time Sequence of neural population activities Movement sequences in a motor program Sequence of places in a maze (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/

(C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/ Binding Problem Different properties (e.g. direction, color, depth, edge/surface properties) of single objects are encoded separately. Several competing theories try to address this problem. (C) 2008, SNU Biointelligence Lab, http://bi.snu.ac.kr/