TY - JOUR
T1 - Single-Trial Mechanisms Underlying Changes in Averaged P300 ERP Amplitude and Latency in Military Service Members After Combat Deployment
AU - Trongnetrpunya, Amy
AU - Rapp, Paul
AU - Wang, Chao
AU - Darmon, David
AU - Costanzo, Michelle E.
AU - Nathan, Dominic E.
AU - Roy, Michael J.
AU - Cellucci, Christopher J.
AU - Keyser, David
N1 - Publisher Copyright:
© Copyright © 2019 Trongnetrpunya, Rapp, Wang, Darmon, Costanzo, Nathan, Roy, Cellucci and Keyser.
PY - 2019/10/25
Y1 - 2019/10/25
N2 - Attenuation in P300 amplitude has been characterized in a wide range of neurological and psychiatric disorders such as dementia, schizophrenia, and posttraumatic stress disorder (PTSD). However, it is unclear whether the attenuation observed in the averaged event-related potential (ERP) is due to the reduction of neural resources available for cognitive processing, the decreased consistency of cognitive resource allocation, or the increased instability of cognitive processing speed. In this study, we investigated this problem by estimating single-trial P300 amplitude and latency using a modified Woody filter and examined the relation between amplitudes and latencies from the single-trial level to the averaged ERP level. ERPs were recorded from 30 military service members returning from combat deployment at two time points separated by 6 or 12 months. A conventional visual oddball task was used to elicit P300. We observed that the extent of changes in the within-subject average P300 amplitude over time was significantly correlated with the amount of change in three single-trial measures: (1) the latency variance of the single-trial P300 (r = −0.440, p = 0.0102); (2) the percentage of P300-absent trials (r = −0.488, p = 0.005); and (3) the consistent variation of the single-trial amplitude (r = 0.571, p = 0.0022). These findings suggest that there are multiple underlying mechanisms on the single-trial level that contribute to the changes in amplitudes seen at the averaged ERP level. The changes between the first and second assessments were quantified with the intraclass correlation coefficient, the standard error of measurement and the minimal detectable difference. The unique population, the small sample size and the large fraction of participants lost to follow up precludes generalizations of these measures of change to other populations.
AB - Attenuation in P300 amplitude has been characterized in a wide range of neurological and psychiatric disorders such as dementia, schizophrenia, and posttraumatic stress disorder (PTSD). However, it is unclear whether the attenuation observed in the averaged event-related potential (ERP) is due to the reduction of neural resources available for cognitive processing, the decreased consistency of cognitive resource allocation, or the increased instability of cognitive processing speed. In this study, we investigated this problem by estimating single-trial P300 amplitude and latency using a modified Woody filter and examined the relation between amplitudes and latencies from the single-trial level to the averaged ERP level. ERPs were recorded from 30 military service members returning from combat deployment at two time points separated by 6 or 12 months. A conventional visual oddball task was used to elicit P300. We observed that the extent of changes in the within-subject average P300 amplitude over time was significantly correlated with the amount of change in three single-trial measures: (1) the latency variance of the single-trial P300 (r = −0.440, p = 0.0102); (2) the percentage of P300-absent trials (r = −0.488, p = 0.005); and (3) the consistent variation of the single-trial amplitude (r = 0.571, p = 0.0022). These findings suggest that there are multiple underlying mechanisms on the single-trial level that contribute to the changes in amplitudes seen at the averaged ERP level. The changes between the first and second assessments were quantified with the intraclass correlation coefficient, the standard error of measurement and the minimal detectable difference. The unique population, the small sample size and the large fraction of participants lost to follow up precludes generalizations of these measures of change to other populations.
KW - ERP
KW - P300
KW - PTSD
KW - combat trauma
KW - single-trial
UR - http://www.scopus.com/inward/record.url?scp=85075230071&partnerID=8YFLogxK
U2 - 10.3389/fnhum.2019.00377
DO - 10.3389/fnhum.2019.00377
M3 - Article
AN - SCOPUS:85075230071
SN - 1662-5161
VL - 13
JO - Frontiers in Human Neuroscience
JF - Frontiers in Human Neuroscience
M1 - 377
ER -