Lecture 5. Biological Bases of Behaviour (IIa)

Lecture 5. Biological Bases of Behaviour (IIa) -...

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Unformatted text preview: Introduction to Psychology PSYC 1001, Section E Monday, Oct. 6, 2008 The Biological Bases of Behaviour (Part II, Ch. 3) Todays class (Objectives) Communication in the N.S. The Synapse Neurotransmitters Brain and Behaviour Brain structure and function Research Methods EEG, Lesioning, ESB, Brain-Imaging Video: Cerebral Laterality Communication in the NS: A brief review (Lecture 4) Two main types of cells: Neurons & Glia Glia Astrocytes, Microglia, Oligodendroglia, Ependymoctes Neurons Dendrites, Soma, Axon, Axon hillock, Terminal buttons The neural impulse Resting membrane potential Action potential & the All-or-none law Signal propagation The Action Potential Synaptic cleft Pre synaptic neuron Post synaptic neuron The Synapse Pre synaptic neuron Output Synaptic vesicles Neurotransmitters Synaptic cleft Post synaptic neuron Input Receptors (Receptor sites) Sending Signals: Output Synthesis and Storage Soma (DNA, transcription, translation) Axon (vesicles) Release of Neurotransmitter Terminal button Ca 2+ enters terminal causes vesicles to fuse with presynaptic membrane & empty their contents into the synaptic cleft Receiving Signals: Input Activation of Receptor Sites After being released, Nt diffuses across the synapse and activates receptors on the postsynaptic membrane Receiving Signals: Input Postsynaptic potential (PSP): Voltage change at receptor site Graded , not all-or-none (like an AP) Small voltage fluctuation in the cell membrane Cause a brief increase (hyperpolarization) or decrease (depolarization) in electrical charge across the cell membrane Changes the probability of the postsynaptic neuron firing an AP Change in Ion Concentration Change in Membrane Potential Postsynaptic Potentials...
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This note was uploaded on 04/04/2010 for the course 32611 PSYC 1001 taught by Professor Darcylitteljohn during the Fall '08 term at Carleton CA.

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Lecture 5. Biological Bases of Behaviour (IIa) -...

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