What is the neural basis of behavior
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What is the neural basis of behavior?. Molecular vs . Molar levels of analysis The Neuron Structure Electrical and Chemical Action The Action Potential and the All-or-None Law Synaptic Transmission Neurotransmitters. Nodes of Ranvier. Axon. Myelin sheath. Axon terminals. Dendrites.

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What is the neural basis of behavior
What is the neural basis of behavior?

  • Molecularvs. Molar levels of analysis

  • The Neuron

    • Structure

    • Electrical and Chemical Action

      • The Action Potential and the All-or-None Law

    • Synaptic Transmission

    • Neurotransmitters


Nodes of Ranvier

Axon

Myelin sheath

Axon terminals

Dendrites

(See Gleitman, p. 63)

(cell nucleus)

Neural impulse

(cell body)


At threshold:

500 msec

At 160% of threshold:

At 270% of threshold:

(See Gleitman, p. 70)

Axon

Recording electrodes


The action potential voltage change over time

depolarization

repolarization

hyperpolarization

resting

potential

(polarized)

refractory period

Stimulus onset

(See Gleitman, p. 68)

The action potentialVoltage change over Time


These axon terminals have

excitatoryeffects.

These axon terminals have

inhibitory effects.

Dendrite

Axon


Dendrites

Temporal summation:

several impulses from one source over time

Spatial summation:

several impulses from several sources converging at the same time


(See Gleitman, p. 69)

K+

K+

K+

(outside)

Na+

Na+

(inside)

Na+

(outside)

(inside)

Na+

Na+

Na+


Neural impulse

Synaptic vesicle

Axon terminal

Presynaptic

membrane

Binding site

Neurotransmitter molecule

Postsynaptic

membrane

(See Gleitman, p. 72)

Axon of the sending neuron

Synapse

(Synaptic gap

or cleft)

Receiving neuron


A brief selection of well known neurotransmitter substances from gleitman pp 73 75
A brief selection of well known neurotransmitter substances(from Gleitman, pp. 73-75):

  • Acetylcholine (+)

  • Serotonin (+)

  • Catecholamines:

    • Dopamine (+)

    • Norepinephrine (+)

  • Amino Acids

    • GABA (-)

    • Glutamate (+)


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