1. Neural Correlates Underlying The Effect of Value on Recognition Memory
nice, and cheaper than mine (by 30 cents), check out the abstract for what Mike Cohen is presenting, interesting shit
Neural Correlates Underlying The Effect of Value on Recognition Memory
MACLab
The Memory & Attention Control Laboratory
Blake L. Elliott, Chris Blais, Gene A. Brewer
Arizona State University
Introduction
Behavioral Results
Parietal Old/New
The ability to prioritize information in terms of it’s importance or value is a key aspect of human memory. This ability has been tested using a paradigm called value directed remembering (VDR) in which point values are assigned to stimuli that will later be tested. Participants attempt to score as many points as possible by correctly remembering the stimuli associated with higher value (Watkins and Bloom, 1999; Castel, 2002). In the current experiment we used a modified VDR task to test whether value has any effect on the neural correlates typically observed during a recognition memory task. Successful recognition memory consists of 2 processes, recollection and familiarity (for review, see Yonelinas, 2002). One method used to dissociate these two processes is event related potential’s (ERP’s). Familiarity has been associated with an early frontal ERP component (FN400) and recollection with a later parietal component (parietal old/new; Rugg and Curran, 2007). Post-retrieval operations that influence recollection are associated with the frontal slow wave component. *
High
Value
Low
95% CI for
Mean
Difference
Outcome M SD n t df
Total Hit
Rate
.78
.12
.65
.18 30
0.07, 0.18
4.766* 29
Recollect
.44
.24
.28
.21
0.11, 0.22
6.032* 28
Familiar
.34
.37
.19
-0.08, 0.10
1.557
*p<.01
High Value
Low Value
Higher value words were remembered better than lower valued words. This recognition advantage for high value words was seen only for recollection responses, and not for familiar responses.
Significant difference between High Value Hits (M=5.91, SD=3.82) compared to Low Value Hits (M=5.01, SD=3.81) t(29)= p<.01. ms
Methods
FN400
Frontal Slow Wave
30 Participants
Study phase: 40 nouns from the Toronto noun pool assigned either a high value (7 or 9) or low value (1 or 3)
Test phase: 80 words, including all 40 from the study phase, self paced responses of either New, Familiar, or Recollect
Words were shown for 2 seconds, interstimulus intervals randomly jittered between ms
Study and test phase 1 block, 5 blocks completed
ERP’s: Measured during retrieval, ms, ms,and ms post-stimulus .
Encoding Retrieval
No significant difference between High Value Hits (M= -2.00, SD=4.20) and Low Value Hits (M= -2.32, SD=4.65) t(29)=.814.
Significant difference between High Value Hits (M=1.95, SD=4.45) compared to Low Value Hits (M=0.84, SD=5.27) t(29)=3.280 p<.05. ms ms 9
CAR
CAT
References
Conclusion + + 3
DOG
CAR
- Allan, K., Wilding, E. L., & Rugg, M. D. (1998). Electrophysiological evidence for dissociable processes contributing to recollection. Acta Psychologica, 98(2-3), 231– Castel, A. D., Benjamin, A. S., Craik, F. I. M., & Watkins, M. J. (2002). The effects of aging on selectivity and control in short-term recall. Memory & Cognition, 30(7), Rugg, M. D., & Curran, T. (2007). Event-related potentials and recognition memory. Trends in Cognitive Sciences, 11(6), doi: - Watkins, M. J., & Bloom, L. C. (1999). Selectivity in memory: An exploration of willful control over the remembering process. Unpublished manuscript - Yonelinas, A. P. (2002). The nature of recollection and familiarity: A review of 30 years of research. Journal of Memory and Language, 46(3), doi:
The behavioral results indicate that higher value words were remembered better than lower valued words, and that this effect was seen solely for recollected responses. This suggests that high value words may have been encoded more deeply than lower value words. The ERP data supports this hypothesis, as the FN400 component shows no effect of value, while the later parietal component and frontal slow wave shows an effect of value. The effect of value on the frontal slow wave suggests that in addition to value effecting retrieval operations, higher values may also increase post-retrieval operations, which may account for some of the effect of value on recollect responses (Allen et. al. 1998).
Time … …
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