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lec05-2 - Spatial Rehearsal in the VSP Overview of the...

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Spatial Rehearsal in the VSP Psychology 355: Cognitive Psychology Winter Quarter 2009 2/3/2009
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P 355, Miyamoto, Winter '09 2 Outline • Spatial Rehearsal – what is it? • Neuropsychological Evidence for Spatial Rehearsal in Monkeys • Brief overview of the central executive Next: Spatial Rehearsal – What Is It?
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P 355, Miyamoto, Winter '09 3 Evidence for Spatial Rehearsal • Spatial rehearsal – actively maintaining spatial information in VSP. Does spatial rehearsal actually occur? • Maintaining a visual location in working memory primes that location for other processing. o Evidence for this is not given in lecture notes or the textbook. Good source on this point is Awh, E., Jonides, J., & Reuter-Lorenz, P. A. (1998). Rehearsal in spatial working memory. Journal of Experimental Psychology: Human Perception and Performance , 24, 780-790. • Single-cell recordings in monkey dorsolateral prefrontal cortex (DLPFC) display increased firing while the monkey is maintaining memory for a specific location. o To be discussed later in this lecture, or the next lecture, depending on time constraints. Next: Delayed Match-to-Sample Paradigm
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P 355, Miyamoto, Winter '09 4 Delayed-Match-To-Sample Paradigm (a) Monkey sees where food is located. (b) Hidden delay (10 seconds) (c) Monkey reaches for food (or makes a mistake and reaches in the wrong place). Next: Results for Delayed Match-to-Sample
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P 355, Miyamoto, Winter '09 5 Results: Delayed-Match-To-Sample Paradigm Evidence for Spatial Rehearsal: Single-cell recordings in monkey prefrontal cortex shows that neural activity correlates with the three stages of this task: o Some neurons become active during the initial placement of the food. o Some neurons become active only during the delay period (spatial rehearsal). o Some neurons become active only when the response is made. Monkeys with frontal lesions cannot do this task. Human infants cannot do task until about 12 months old. Next: Memory for Location Task – 6 Target Locations
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P 355, Miyamoto, Winter '09 6 Monkey Performance on a Memory for Location Task • Same idea as the preceding delayed-match-to-sample task (preceding slide), except . ... o there are multiple locations to remember, and .... o the response is an eye movement. + + + Target Stimulus Eye Movement Response Delay Period Next: Results of Single-Cell Recordings on Memory for Location Task
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P 355, Miyamoto, Winter '09 7 Single-Cell Neural Response on a Memory for Location Task • Neurons in dorsolateral prefrontal cortex show sustained activity during delay period that is selective of the particular location to be remembered. • Errors occur when this sustained activity fails to initiate or decays before end of delay period.
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