A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength
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The Ohio State University / OhioLINK
2014
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=osu1415700019 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu14157000192021-08-03T06:27:54Z A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength Greenberg, Jeffrey Alexander Cognitive Psychology Neurosciences associative recognition diffusion model EEG retrieval decision making The neural correlates of recognition memory retrieval have long been studied, usually by identifying patterns of activity that differ between experimental conditions such as “old” (studied) or “new” (non-studied). However, recent studies have revealed differences in neural activity between conditions that may not necessarily reflect the underlying cognitive process of interest. In fact, some of these studies argue a thorough interpretation of these results must involve mapping the data onto computational model parameters (Ratcliff, Philiastides, Sajda 2009; Philiastides, Ratcliff, Sajda, 2006). In this study, we recorded scalp EEG data from participants as they performed a simple associative recognition task, and searched for neural activity that discriminated between “intact” (studied) and “rearranged” (non-studied) test pairs during the decision (retrieval) period on a trial-by-trial basis. We did so by using a single-trial analysis method of EEG, which involves combining the electrical signal from all electrodes for each intact and rearranged trial and assigning logistic regression weights to them. These weights measure, within a given experimental condition, how strongly the neural activity resembles an intact versus rearranged signal across the time of the decision period. To determine whether such components actually reflect the evidence accumulation process of decision making during retrieval, we relate independently derived neural measures (via the single-trial regressor weights) and behavioral measures (via diffusion model fits). We find a single neural signal at 600 ms after test pair presentation that discriminates between intact and rearranged pairs. Furthermore, the magnitude of this signal sorted the behavioral data across intact conditions into halves such that, when re-fit separately by the diffusion model, drift rates were different for the two halves. This result suggests that the component we found reflects a measure of associative memory strength. Furthermore, a similar study using the same methods to study item recognition also found only one component that reflected drift rate with qualitatively similar timing and topography, suggesting that this component is a more general memory strength signal that is conserved across recognition tasks. 2014 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1415700019 http://rave.ohiolink.edu/etdc/view?acc_num=osu1415700019 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Cognitive Psychology Neurosciences associative recognition diffusion model EEG retrieval decision making |
| spellingShingle |
Cognitive Psychology Neurosciences associative recognition diffusion model EEG retrieval decision making Greenberg, Jeffrey Alexander A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength |
| author |
Greenberg, Jeffrey Alexander |
| author_facet |
Greenberg, Jeffrey Alexander |
| author_sort |
Greenberg, Jeffrey Alexander |
| title |
A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength |
| title_short |
A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength |
| title_full |
A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength |
| title_fullStr |
A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength |
| title_full_unstemmed |
A Single Trial Analysis of EEG in Associative Recognition Memory: Tracking the Neural Correlates of Associative Memory Strength |
| title_sort |
single trial analysis of eeg in associative recognition memory: tracking the neural correlates of associative memory strength |
| publisher |
The Ohio State University / OhioLINK |
| publishDate |
2014 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1415700019 |
| work_keys_str_mv |
AT greenbergjeffreyalexander asingletrialanalysisofeeginassociativerecognitionmemorytrackingtheneuralcorrelatesofassociativememorystrength AT greenbergjeffreyalexander singletrialanalysisofeeginassociativerecognitionmemorytrackingtheneuralcorrelatesofassociativememorystrength |
| _version_ |
1719437287055425536 |