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Psychology

Structure Function of Brain & Neuron Structure & Function

TermDefinition
CNS Brain & Spinal Cord
Spinal Cord Transfer messages to and from brain to PNS
Function of PNS Sends messages to whole body from brain &vice versa
2 Divisions of PNS Somatic Nervous System & Autonomic System
Somatic Nervous System Transmits and receives messages from senses
What does the SNS consist of? Sensory & Motor Neurons
Autonomic Nervous System Transmit and receives messages from organs
What is the ANS divided into? Sympathetic & Parasympathetic
Sympathetic Increases Activity
Parasympathetic Decreases Activity
1st stage of Fight or Flight Hypothalamus recognises a threat, sends message to adrenal gland
2nd Stage of Flight or Fight Adrenal Medulla sends adrenaline to endocrine & Nordrenaline to Brain
Examples of changes in Fight or Flight Heart Rate increase Pupil dilation Muscular tension Faster breathing
James-Lange suggested Emotional experience is result not cause
James-Lange example We see bear, we frightened & we run., however we frightened because we run
Sensory Neurons Informs body about internal & external environment by giving info from senses
Hebb's Learning theory When 1 Neuron sends signal to 1, the 2nd gets activated, & connection is strengthened
Hebbian Learning Every new experience brain rewires it's physical structure
Hebbian Learning occurs through what? Long Term Potentiation
LTP Results in lasting changes in sympathetic connections
Changes in connections Responsible for Learning & Memory
Synaptic Transmission Definition Messages sent from Neuron to Neuron
Synapse Specialised gap between Neurons
Synaptic Transmission Stage 1 Electrical impulse travels down Neuron, prompting release of Neurotransmitters to Pre Synaptic terminal
Synaptic Transmission Stage 2 Neurotransmitters released to synaptic fluid in synapse
'Examples of Neurotransmitters Serotonin & Dopamine
Synaptic Transmission Stage 3 Adjacent Neuron quickly takes Neurotransmitter from fluid and converts to electrical impulse to next Neuron
Excitatory Potentials More likely to fire (Post Synaptic Fire)
Inhibitory Potentials Less likely to fire (Stop at Post Synaptic neuron
Created by: Shahed-02
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