Lec 3-Neural systems

Lec 3-Neural systems - neurons. This is convergence . –...

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Nervous System Hardware Neurons Action potentials Connections among neurons Changing connections among neurons Vision and connections for opponent process color vision Hearing and neural systems for pitch and location coding
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Blindspot Experiment Assume the eye is 1.7 cm from cornea to retina Average size of blindspot for class was .11 cm for both eyes. .08 to .14 cm includes two standard deviations
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Neurons
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Communication btwn neurons is not typically a one-to-one event. Sometimes a single neuron branches and its collaterals synapse on multiple target neurons. This is known as divergence . A single postsynaptic neuron may have synapses with as many as 10,000 postsynaptic
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Unformatted text preview: neurons. This is convergence . – Can you think of an advantage to having convergent and divergent circuits? Figure 4.16 The color solid Figure 4.17 Additive versus subtractive color mixing Theories of Color Vision • Trichromatic theory- Young and Helmholtz – Receptors for red, green, blue – color mixing • Opponent Process theory – Hering – 3 pairs of antagonistic colors – red/green, blue/yellow, black/white • Current perspective: both theories necessary Figure 4.46 The human ear Hearings • Pitch – Cycle by cycle coding – Place coding • Location – Time difference coding – Loudness – Frequency envelope...
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This note was uploaded on 09/08/2010 for the course PSYC 135 at San Jose State.

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Lec 3-Neural systems - neurons. This is convergence . –...

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