Electrophysiological evidence of enhanced performance monitoring in recently abstinent alcoholic men.
- Authors
- Padilla, Mayra L; Colrain, Ian M; Sullivan, Edith V; Mayer, Benjamin Z; Turlington, Sharon R; Hoffman, Lindsay R; Wagstaff, Amanda E; Pfefferbaum, Adolf
- Year
- 2011
- Journal
- Psychopharmacology
- PMID
- 20941595
- DOI
- 10.1007/s00213-010-2018-1
- PMCID
- PMC3015191
RATIONALE: Chronic alcoholism is associated with mild to moderate cognitive impairment. Under certain conditions, impairment can be ameliorated by invoking compensatory processes. OBJECTIVE: To identify electrophysiological mechanisms of such compensation that would be required to resolve response conflict. METHODS: 14 abstinent alcoholic men and 14 similarly aged control men performed a variation of the Eriksen flanker task during an electroencephalography (EEG) recording to examine whether alcoholics could achieve and maintain control-level performance and whether EEG markers could identify evidence for the action of compensatory processes in the alcoholics. Monitoring processes engaged following a response were indexed by the correct related negativity (CRN) and error related negativity (ERN), two medial-frontal negative event-related potentials. RESULTS: The alcoholics were able to perform at control levels on accuracy and reaction time (RT). Alcoholics generated larger ERN amplitudes following incorrect responses and larger CRNs following correct responses than controls. Both groups showed evidence of post-error slowing. Larger CRN amplitudes in the alcoholics were related to longer RTs. Also observed in the alcoholics was an association between smaller CRN amplitudes and length of sobriety, suggesting a normalization of monitoring activity with extended abstinence. CONCLUSIONS: To the extent that greater amplitude of these electrophysiological markers of performance monitoring indexes greater resource allocation and performance compensation, the larger amplitudes observed in the alcoholic than control group support the view that elevated performance monitoring enables abstinent alcoholics to overcome response conflict, as was evident in their control-level performance.
Task description. Outline of the sequence of events for the four different experimental conditions: high stimulus conflict and high response conflict (HsHr), high stimulus conflict and low response conflict (HsLr), low stimulus conflict and high response conflict (LsHr), low stimulus conflict and low response conflict (LsLr)
a RTs for correct trials by conditions. Data represent mean values and error bars represent standard errors for each condition. b RTs for correct and error trials. Data represent mean values and error bars represent standard errors for overall correct and error trials
N2 amplitudes. Peak N2 values from electrode FCZ are plotted for the four condition types for correct responses. Error bars index standard error for each condition. Alcoholics produced similar amplitude N2 potentials to control group. This implies that similar stimulus processing occurred in both groups
N2 waveforms. Stimulus-locked N2 waveforms at electrode FCZ for correct response are plotted for the four conditions (HsHr, HsLr, LsHr, LsLr) in dark blue (solid line) for controls and in red (dashed line) for alcoholics. No group differences were found
a CRN amplitudes by condition. CRN mean amplitudes from electrode FCZ and their respective error bars, which index standard error values, are displayed for the four condition types for correct responses. Alcoholics generated significantly larger negative amplitudes than the controls suggesting that they engaged enhanced performance monitoring processes during all correct trial types. b CRN and ERN amplitudes. Mean CRN and ERN amplitudes from electrode FCZ are displayed with their corresponding standard error bars. CRN represents the mean amplitude across all correct trial types and the ERN represents the mean amplitude for all incorrect responses. Alcoholics generated significantly larger negative amplitude potentials for both correct and incorrect trials compared to the controls
a CRN waveforms. Response-locked CRN waveforms at electrode FCZ for correct responses are plotted for the four condition types (HsHr, HsLr, LsHr, LsLr) in dark blue (solid line) for controls and in red (dashed line) for alcoholics. Alcoholics produced larger CRN potentials for all trial types than control subjects. Note that the peak values represented in this figure do not correspond to the values reported in Fig. 5a as those are the average amplitude over a 100 ms time window. b CRN and ERN waveforms. Response-locked correct (left panel) and incorrect (right panel) waveforms are plotted at electrode FCZ in dark blue (solid line) for controls and in red (dashed line) for alcoholics. Waveforms were derived by averaging across all four trial types. Alcoholics compared to the controls produced significantly larger CRN amplitudes for all correct responses and larger ERN amplitudes to all incorrect responses. Note that the peak values represented in this figure do not correspond to the values reported in Fig. 5b as those are the average amplitude over a 100 ms time window
| # | Section | Preview |
|---|---|---|
| 40 | Discussion | To the extent that greater amplitude of these electrophysiological markers of performance monitoring⦠|
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| Understanding alcohol use disorders with neuroelectrophysiology. | 2014 | 25307587 |
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