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COGNITIVE SCIENCE 107A Electrophysiology 4: Neural Codes Jaime A. Pineda, Ph.D.

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COGNITIVE SCIENCE 107A Electrophysiology 4: Neural Codes Jaime A. Pineda, Ph.D.

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    2. The Lab Your PC/CSB101/CSB115 http://bci.ucsd.edu/~pineda/COGS107A/index.html Labs - Electrophysiology Home - ModelNeuron.zip Download ModelNeuron.zip Uncompress ModelNeuron.zip Double click on ccwin32 Do the assignment. *** PASSIVE.CCS=PASS.CCS, ACTIVE.CCS=ACTIV.CCS

    3. Neural Code

    4. Neural Code A system of rules and mechanisms by which a signal carries information A number of Hypotheses Single Neuron Coding The Rate-Coding Hypothesis The Temporal-Coding Hypothesis Population Coding The Independent-Coding Hypothesis The Coordinated-Coding Hypothesis

    5. The Rate-Coding Hypothesis

    6. Rate-Coding – Tuning Curve

    7. Rate-Coding – Tuning Curve

    8. Rate-Coding - Value

    9. The Temporal-Coding Hypothesis The temporal structure of a spike-train carries information about the temporal structure of the stimulus

    10. Population Coding Information is carried by pools of neurons The Independent-Coding Hypothesis each neuron contributes to the pool independently the “vote” of each neuron gives a population vector The Coordinated-Coding Hypothesis the relationships among the neurons in a population is an important part of the signal. the signal cannot be decoded without considering spike synchrony, oscillations, or some other relationship among the neurons in the population.

    11. Independent Coding - Value

    12. Independent Coding – Tuning Curves

    13. Coordinated Coding - Phase

    14. Coordinated Coding - Correlations

    15. Coordinated Coding

    16. Neural Code – Why bother? To understand brain processes Diagnose disorders Prosthetic limbs BCI – brain-computer interface etc.

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