1. 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

2. (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, 

3. 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, 

4. (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, 

5. A Brief Overview of Current Ideas on Coding Schemes

6. Frequency Coding (rate coding)
Temperature, pressure
Amplitude of sound wave
(C) 2008, SNU Biointelligence Lab, 

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

8. (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, 

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

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

11. 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, 

12. (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,