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Lecture 5

PSYC 2650 Lecture Notes - Lecture 5: Head Injury, Memory Span, Lobectomy


Department
Psychology
Course Code
PSYC 2650
Professor
Dan Meegan
Lecture
5

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LECTURE NOTES: MIDTERM #2: 5
VIDEO CLIPS
Amnesic “Mike”
oFrom “The Brain Series (2nd Ed)”
Fictional amnesic character Leonard
oFrom the film “Memento” (Scene 34)
CAUSES OF AMNESIA
Causes can vary but they all fall upon brain areas, e.g.
oHead injury
oCerebral vascular incident (e.g. stroke)
oEpileptic activity
oNeurosurgery
The patient HM
oTumors
oAlcohol abuse
oEtc.
SYMPTOMS: DEFINITIONS
Anterograde amnesia (AA) is the inability to learn new things or remember information
learned after the onset of amnesia
Retrograde amnesia (RA) is the difficulty in remembering events that occurred before the
onset of amnesia
HEAD INJURY
Often both AA and RA
Recovery with time
However, there will be a permanent loss of memory for events preceding injury (RA) and for
events occurring during time of AA
The symptoms are not limited to memory loss
As time goes on after trauma memory comes back
oSome cases you cannot remember prior events to up to and even over 2 years back
oAs time goes by the RA interval decreases
NEUROSURGERY
HM had epilepsy which caused seizures
They originated in the medial temporal lobe
So surgeons cut the connection – bilateral medial temporal lobectomy (essentially they cute the
hippocampus out)
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