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EEG correlates of subvocal rehearsal...

Hwang, Grace Mei-Hua.

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EEG correlates of subvocal rehearsal, familiarity and recollection, and behavior.

Record Type:	Electronic resources : Monograph/item
Title/Author:	EEG correlates of subvocal rehearsal, familiarity and recollection, and behavior./
Author:	Hwang, Grace Mei-Hua.
Description:	162 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3004.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Biophysics, General. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3179265
ISBN:	0542192756

EEG correlates of subvocal rehearsal, familiarity and recollection, and behavior.
Hwang, Grace Mei-Hua.

EEG correlates of subvocal rehearsal, familiarity and recollection, and behavior. - 162 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3004.

Thesis (Ph.D.)--Brandeis University, 2005.

EEG signals have recently been implicated in working memory, particularly during encoding, retention, and retrieval. Different processes govern the retention of information in nonverbal and verbal working memory, the latter depending specifically on Subvocal rehearsal of items. During retrieval, dual-process theorists posit that two components of the event-related potential (ERP), the N400 and the P300, index the processes of familiarity and recollection, respectively. We explored EEG signals in search of correlates of Subvocal rehearsal, familiarity and recollection, and behavior.

ISBN: 0542192756Subjects--Topical Terms:

1019105
Biophysics, General.

EEG correlates of subvocal rehearsal, familiarity and recollection, and behavior.
LDR:03254nmm 2200325 4500 001 1817069
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008 130610s2005 eng d
020 $a 0542192756
035 $a (UnM)AAI3179265
035 $a AAI3179265
040 $a UnM $c UnM
100 1 $a Hwang, Grace Mei-Hua. $3 1906432
245 1 0 $a EEG correlates of subvocal rehearsal, familiarity and recollection, and behavior.
300 $a 162 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3004.
500 $a Advisers: Michael J. Kahana; Robert Sekuler.
502 $a Thesis (Ph.D.)--Brandeis University, 2005.
520 $a EEG signals have recently been implicated in working memory, particularly during encoding, retention, and retrieval. Different processes govern the retention of information in nonverbal and verbal working memory, the latter depending specifically on Subvocal rehearsal of items. During retrieval, dual-process theorists posit that two components of the event-related potential (ERP), the N400 and the P300, index the processes of familiarity and recollection, respectively. We explored EEG signals in search of correlates of Subvocal rehearsal, familiarity and recollection, and behavior.
520 $a We recorded scalp EEG's on subjects performing a Sternberg memory task using verbal stimuli (letters, words, and pictures of common objects) and nonverbal stimuli (spatial dot locations and sinusoidal grating patterns). We found oscillatory correlates unique to verbal stimuli in the 4--8 Hz theta, 9--12 Hz alpha, 14--28 Hz beta, and 30--50 Hz gamma frequency bands. Verbal stimuli elicited greater power than nonverbal stimuli bilaterally in theta, in frontal and occipital areas in alpha and beta, and centrally in gamma. Looking specifically for instances where power in the tune intervals between item presentations was greater than power during presentations, we found enhanced beta oscillations in the frontal and occipital regions. During retrieval, we found that the N400 differentiated old from new verbal stimuli, but did not differentiate old from new nonverbal stimuli. However, the P300 differentiated old from new for both verbal and nonverbal stimuli types. We conclude that beta oscillations are involved in verbal Subvocal rehearsal, and that familiarity requires a semantic label, whereas recollection does not.
520 $a When we searched for correlates of behavior, we found that enhanced theta oscillations in the left parietal, central, and right parietal regions were correlated with recognition, difficulty, and memory load, respectively. Oscillations at other frequencies were also correlated with behavior, with the amplitude of 2--4 Hz delta increasing with memory strength and the amplitude of 25--60 Hz gamma increasing with longer reaction times. Our observations indicate that the functional roles of oscillations vary throughout the brain.
590 $a School code: 0021.
650 4 $a Biophysics, General. $3 1019105
650 4 $a Biology, Neuroscience. $3 1017680
650 4 $a Psychology, Cognitive. $3 1017810
690 $a 0786
690 $a 0317
690 $a 0633
710 2 0 $a Brandeis University. $3 1017415
773 0 $t Dissertation Abstracts International $g 66-06B.
790 1 0 $a Kahana, Michael J., $e advisor
790 1 0 $a Sekuler, Robert, $e advisor
790 $a 0021
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3179265