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LM1
Working Memory (Tests (Tower of Hanoi, Wisconsin Card Switching
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LM1
Working Memory
Tests
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Self-ordered Memory Task
Knowing what you have done before so you can advance. E.g. remembering in which rooms you already searched for an item
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Brain Areas
PFC
See Fuster & Alexanderseems to maintain actiivity despite distraction Gif_animation.gif))-
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Models
Atkinson-Shiffrin 
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Baddeley-Hitch
Place where not
just storage, but also
manipulation happens
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Fuster & Alexander
1971
Abstract
- Monkeys performed a delayed response test. Example
Cue Period>>Delay Period>>Response Period.
- During the test, some neurons fired differently: In the PFC, and the Nucleus Medialis Dorsalis of the Thalamus
- Most cells increase firing during the cue presentation period or at the beginning of the ensuing delay;
- Some cells show a higher spike discharge
during the whole delay period than during the intertrial period.
These changes are interpreted as suggestive
evidence of a role of fronto-thalamic circuits in the
attentive process involved in short-term memory.
Notes
- Almost all the neurons that were measured showed highly irregular patterns of spontaneous firing while the animal was at rest during the intertrial periods.
- * Increased firing was in some units preceded by an inhibitiory phase covering the beginning or the entirety of the cue presentation period. This was most strongly so in the cells that fired most frequently during the delay period.
- Eye-movements did not correlate with neuronal firing of the measured units
- 18% of MD and 28 of PFC Units did not change firing during the whole trial
- One unit had activation during the DRT, and also from food-cries of other monkeys (tape-recorded)
- No unit showed different reactions to left or right position of the food. Thus, they seem not to be implicated in information encoding.
- To perform a DRT, the monkey needs to direct its attention to the just stored information. Fuster and Alexander think that the activated units were involved in this attention process.
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