PSYC 434 Memory
Terms in this set (18)
Getting into STM
Stabilizing over a longer time period; changes in the brain stabilize a memory over time resulting in a long term memory
Different types of memory are mediated by different neural mechanism, but ___________.
they all involve cellular and circuitry changes
H.M. (Henry Molaison)
Had Bilateral Medial Temporal Lobectomy
After surgery he had normal intelligence and normal short term memory, but had severe anterograde amnesia
He also had retrograde amnesia for about 3 years before surgery (more distant memories were not affected)
Lessons from amnesiacs
Gave a lot of useful information for how memory work
The extent of deficits depends on how much of MTL is remove
-More posterior removed = worse
-Deficits are much less noticeable when only 1 side is removed
-Has to be a bilateral removal to be more severe
The MTL is necessary for ______ but not necessary for ________?
Necessary for forming new long term memories
Not necessary for formation and retrieval of STM or long term procedural memory and motor skills
Definition of Sensory Memory
Transient retention of memory in the sensory structures
Properties of sensory memory
• Decays rapidly (varies by modality)
• Has a large capacity
•Stores sensory information (not semantic)
How long does echoic memory last?
(MMN; or MMF for MEG)
• MMN reflects comparison between stimulus and information in sensory (echoic) memory
• Suggests information in echoic memory lasts
for ~10 seconds
How long does iconic memory last?
Mostly gone by 500ms.
Experiment concerning the duration of iconic memory
Quickly flash array of letters and then auditory tone cue people to the row of letters (i.e. top row)
-By varying which line of letters to repeat, people can recall the letters
-If do not cue, people recall less of the letters
Short Term Memory (STM)
-Longer course than Sensory Memory
How big the capacity of STM?
-Magic number 7 plus or minus 2 is the amount of items you can remember in STM
-Chunking helps exand capacity
-Capacity for visual memory is about 4
Atkinson and Shiffrin Model
This presented the information in a very serial form, but do you need to encode something in STM in order for it to make it to long term memory?
Do you need to encode something in STM in order for it to make it to long term memory?
At least 2 patients with damage near the Left Sylvian Fissure, had STM deficits without LTM deficits
(double disassociation with H.M.)
There are evidence against the notion that memory is stored in a serial manner
• STM redefined by Baddeley highlights the fact that manipulation of the information
can take place in STM
• 3 Main Components:
-Visuospatial Sketch Pad
1 Hypothesis is that the Phonological Loop and Visuospatial Sketch Pad may
correlate with WM systems in each hemisphere of the brain?
Verbal memory (phonological loop): left hemisphere near premotor cortex
Spatial (visuospatial): right hemisphere near parieto-occipital regions