Chapter 12 Flashcards
Hippocampal formation
Forebrain structure of temporal lobe, constituting important part of limbic system
Long term potentiation
Long term increase in excitability of neuron to particular synaptic input caused by repeated high frequency of activity of that input
Population EPSP
Evoked potential that represents EPSPs of population of neuron
Associative long term potentiation
When weak and strong synapses to a single neuron are stimulated, the weak synapse becomes stronger
Role of NMDA a receptors
Series of high rate pulses in one burst cause long term potentiation and low rate does not
Membrane must be depolarizer while synapses are active
Thus because this receptor is blocked by Mg2+ until depolarized and then calcium may enter
Needs glutamate and depolarization!
Neurotransmitter and voltage dependent!!!!!!!!!!!
Long term depression
Inputs are activated while weakly depolarized or hyperpolarized
Anterograde amnesia
Can’t remember events after head trauma
Retrograde amnesia
Can’t remember events before head trauma
Korsakoff’s syndrome
Permanent anterograde amnesia usually from alcoholism
Confabulation
Report events that didn’t happen that you think did
Short term memory
Limited space short term
Long term memory
Long term
Lots of space
Turning short term into long term memory
Consolidation
Through rehearsal
Declarative memory
Can be verbally expressed
Memory of events
Nondeclarative memory
Memory not dependent on hippocampal formation; collective of perceptual, stimulus response and motor memory
Damage to hippocampus or its suppliers
Causes anterograde amnesia
Memories are initially stored in hippocampus and then
Transferred to frontal cortex
Until 9 years and then both are activated
Episodic memory
Memory of collection of perceptions of events organized in time and identified by context
Semantic memory
Memory of facts and general info
