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Chiang HS, Motes M, Afkhami-Rohani B, Adhikari A, LoBue C, Kraut M, Cullum CM, Hart J. Verbal retrieval deficits due to traumatic brain injury are associated with changes in event related potentials during a Go-NoGo task. Clin Neurophysiol 2024; 163:1-13. [PMID: 38663098 PMCID: PMC11216819 DOI: 10.1016/j.clinph.2024.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 04/04/2024] [Accepted: 04/07/2024] [Indexed: 06/15/2024]
Abstract
OBJECTIVE Verbal retrieval (VR) deficits often occur after traumatic brain injury (TBI), but the mechanisms remain unclear. We examined how event-related potentials (ERPs) during a Go-NoGo task were associated with VR deficits. METHODS Sixty veterans with a history of TBI underwent a neuropsychological battery and a Go-NoGo task with concurrent EEG recording. We compared task performance and ERP measures (N2, P3) between those with and those without persistent injury-related VR deficits. We then used generalized linear modeling to examine the relationship between ERP measures and scores on measures of executive function and processing speed. RESULTS Go-NoGo task performance was comparable between the groups. Those with VR deficits had larger N2 amplitude in NoGo than in Go conditions. In participants with VR deficits, larger NoGo N2/P3 amplitude predicted faster processing speed. Furthermore, larger P3 amplitude and shorter P3 latency of the difference wave (NoGo - Go) predicted faster processing speed in those with VR deficits. CONCLUSIONS Despite no difference in Go-NoGo task performance, ERP amplitude and latency measures associated with cognitive control during Go-NoGo distinguished TBI individuals with VR deficits from those without. SIGNIFICANCE This study furthers our understanding of VR deficits in TBI and implicates potential application of ERP measures in monitoring and treating such deficits.
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Affiliation(s)
- Hsueh-Sheng Chiang
- University of Texas Southwestern Medical Center, Department of Neurology, USA; The University of Texas at Dallas, School of Behavioral and Brain Sciences, USA.
| | - Michael Motes
- The University of Texas at Dallas, School of Behavioral and Brain Sciences, USA.
| | - Borna Afkhami-Rohani
- The University of Texas at Dallas, School of Behavioral and Brain Sciences, USA.
| | - Ashna Adhikari
- The University of Texas at Dallas, School of Behavioral and Brain Sciences, USA.
| | - Christian LoBue
- University of Texas Southwestern Medical Center, Department of Psychiatry, USA; University of Texas Southwestern Medical Center, Department of Neurological Surgery, USA.
| | - Michael Kraut
- The Johns Hopkins School of Medicine, Department of Radiology, USA.
| | - C Munro Cullum
- University of Texas Southwestern Medical Center, Department of Neurology, USA; University of Texas Southwestern Medical Center, Department of Psychiatry, USA; University of Texas Southwestern Medical Center, Department of Neurological Surgery, USA.
| | - John Hart
- University of Texas Southwestern Medical Center, Department of Neurology, USA; The University of Texas at Dallas, School of Behavioral and Brain Sciences, USA; University of Texas Southwestern Medical Center, Department of Psychiatry, USA.
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Chiang H, Mudar RA, Dugas CS, Motes MA, Kraut MA, Hart J. A modified neural circuit framework for semantic memory retrieval with implications for circuit modulation to treat verbal retrieval deficits. Brain Behav 2024; 14:e3490. [PMID: 38680077 PMCID: PMC11056716 DOI: 10.1002/brb3.3490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 01/23/2024] [Accepted: 04/03/2024] [Indexed: 05/01/2024] Open
Abstract
Word finding difficulty is a frequent complaint in older age and disease states, but treatment options are lacking for such verbal retrieval deficits. Better understanding of the neurophysiological and neuroanatomical basis of verbal retrieval function may inform effective interventions. In this article, we review the current evidence of a neural retrieval circuit central to verbal production, including words and semantic memory, that involves the pre-supplementary motor area (pre-SMA), striatum (particularly caudate nucleus), and thalamus. We aim to offer a modified neural circuit framework expanded upon a memory retrieval model proposed in 2013 by Hart et al., as evidence from electrophysiological, functional brain imaging, and noninvasive electrical brain stimulation studies have provided additional pieces of information that converge on a shared neural circuit for retrieval of memory and words. We propose that both the left inferior frontal gyrus and fronto-polar regions should be included in the expanded circuit. All these regions have their respective functional roles during verbal retrieval, such as selection and inhibition during search, initiation and termination of search, maintenance of co-activation across cortical regions, as well as final activation of the retrieved information. We will also highlight the structural connectivity from and to the pre-SMA (e.g., frontal aslant tract and fronto-striatal tract) that facilitates communication between the regions within this circuit. Finally, we will discuss how this circuit and its correlated activity may be affected by disease states and how this circuit may serve as a novel target engagement for neuromodulatory treatment of verbal retrieval deficits.
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Affiliation(s)
- Hsueh‐Sheng Chiang
- Department of NeurologyUniversity of Texas Southwestern Medical CenterDallasTexasUSA
- School of Behavioral and Brain SciencesThe University of Texas at DallasRichardsonTexasUSA
| | - Raksha A. Mudar
- Department of Speech and Hearing ScienceUniversity of Illinois Urbana‐ChampaignChampaignIllinoisUSA
| | - Christine S. Dugas
- School of Behavioral and Brain SciencesThe University of Texas at DallasRichardsonTexasUSA
| | - Michael A. Motes
- School of Behavioral and Brain SciencesThe University of Texas at DallasRichardsonTexasUSA
| | - Michael A. Kraut
- Department of Radiology and Radiological ScienceJohns Hopkins UniversityBaltimoreMarylandUSA
| | - John Hart
- Department of NeurologyUniversity of Texas Southwestern Medical CenterDallasTexasUSA
- School of Behavioral and Brain SciencesThe University of Texas at DallasRichardsonTexasUSA
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Chiang HS, Motes M, Kraut M, Vanneste S, Hart J. High-definition transcranial direct current stimulation modulates theta response during a Go-NoGo task in traumatic brain injury. Clin Neurophysiol 2022; 143:36-47. [PMID: 36108520 PMCID: PMC10545365 DOI: 10.1016/j.clinph.2022.08.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 08/08/2022] [Accepted: 08/24/2022] [Indexed: 11/03/2022]
Abstract
OBJECTIVE High Definition transcranial Direct Current Stimulation (HD-tDCS) has been shown to improve cognitive performance in individuals with chronic traumatic brain injury (TBI), although electrophysiological mechanisms remain unclear. METHODS Veterans with TBI underwent active anodal (N = 15) vs sham (N = 10) HD-tDCS targeting the pre-supplementary motor area (pre-SMA). A Go-NoGo task was conducted simultaneously with electroencephalography (EEG) at baseline and after intervention completion. RESULTS We found increased theta event-related spectral perturbation (ERSP) and inter-trial phase coherence (ITPC) during Go in the frontal midline electrodes overlying the pre-SMA after active HD-tDCS intervention, but not after sham. We also found increased theta phase coherence during Go between the frontal midline and left posterior regions after active HD-tDCS. A late increase in alpha-theta ERSP was found in the left central region after active HD-tDCS. Notably, lower baseline theta ERSP/ITPC in the frontal midline region predicted more post-intervention improvement in Go performance only in the active group. CONCLUSIONS There are local and interregional oscillatory changes in response to HD-tDCS modulation in chronic TBI. SIGNIFICANCE These findings may guide future research in utilizing EEG time-frequency metrics not only to measure interventional effects, but also in selecting candidates who may optimally respond to treatment.
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Affiliation(s)
- Hsueh-Sheng Chiang
- Department of Neurology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA; School of Behavioral and Brain Sciences, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, TX 75080, USA.
| | - Michael Motes
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, TX 75080, USA.
| | - Michael Kraut
- Department of Radiology, The Johns Hopkins University School of Medicine, 601 N Caroline St, Baltimore, MD 21205, USA.
| | - Sven Vanneste
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, TX 75080, USA; Trinity College Dublin, The University of Dublin, College Green, Dublin 2, Ireland.
| | - John Hart
- Department of Neurology, The University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA; School of Behavioral and Brain Sciences, The University of Texas at Dallas, 800 W Campbell Rd, Richardson, TX 75080, USA.
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Chiang HS, Motes M, O'Hair R, Vanneste S, Kraut M, Hart J. Baseline delayed verbal recall predicts response to high definition transcranial direct current stimulation targeting the superior medial frontal cortex. Neurosci Lett 2021; 764:136204. [PMID: 34478816 DOI: 10.1016/j.neulet.2021.136204] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2021] [Revised: 08/25/2021] [Accepted: 08/29/2021] [Indexed: 11/21/2022]
Abstract
Anodal high definition transcranial direct current stimulation (HD-tDCS) targeting the pre-supplementary motor area/dorsal anterior cingulate cortex (pre-SMA/dACC) has recently been shown to improve verbal retrieval deficits in veterans with chronic traumatic brain injury (TBI) (Motes et al., 2020), but predictors of treatment response are unclear. We hypothesized that baseline delayed verbal recall, a sensitive measure for post-TBI chronic cognitive decline, would predict therapeutic effects of HD-tDCS targeting the pre-SMA/dACC for verbal retrieval deficits. Standardized verbal retrieval measures were administered at baseline, immediately after and 8 weeks after treatment completion. We applied mixed generalized linear modeling as a post-hoc subgroup analysis to the verbal retrieval scores that showed significant improvement in Motes at el. (2020) to examine effects of active stimulation across the groups with baseline-intact delayed recall (N = 10) and baseline-impaired delayed recall (N = 8), compared to sham (N = 7). Individuals with impaired baseline delayed recall showed significant improvement (compared to baseline) in both category fluency and color-word inhibition/switch, while individuals with intact delayed recall showed significant improvement only in color-word inhibition/switch. Baseline delayed verbal recall may therefore be considered as a predictor for future electromodulation studies targeting frontal structures to treat TBI-related verbal deficits.
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Affiliation(s)
- Hsueh-Sheng Chiang
- Department of Neurology, The University of Texas Southwestern Medical Center, USA; School of Behavioral and Brain Sciences, The University of Texas at Dallas, USA.
| | - Michael Motes
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, USA
| | - Rachel O'Hair
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, USA
| | - Sven Vanneste
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, USA; Global Brain Health Institute, Trinity College Dublin, Ireland
| | - Michael Kraut
- Department of Radiology, The Johns Hopkins University School of Medicine, USA
| | - John Hart
- Department of Neurology, The University of Texas Southwestern Medical Center, USA; School of Behavioral and Brain Sciences, The University of Texas at Dallas, USA; Department of Psychiatry, The University of Texas Southwestern Medical Center, USA
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Chiang HS, Shakal S, Vanneste S, Kraut M, Hart J. Case Report: Improving Verbal Retrieval Deficits With High Definition Transcranial Direct Current Stimulation Targeting the Pre-Supplementary Motor Area in a Patient With Chronic Traumatic Brain Injury. Front Neurol 2021; 12:678518. [PMID: 34335447 PMCID: PMC8322436 DOI: 10.3389/fneur.2021.678518] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Accepted: 06/22/2021] [Indexed: 11/15/2022] Open
Abstract
We report a patient who has cognitive sequalae including verbal retrieval deficits after severe traumatic brain injury (TBI). The cortico-caudate-thalamic circuit involving the pre-Supplementary Motor Area (pre-SMA) has been proposed to underlie verbal retrieval functions. We hypothesized that High Definition-transcranial Direct Current Stimulation (HD-tDCS) targeting the pre-SMA would selectively modulate this circuit to remediate verbal retrieval deficits. After the patient underwent 10 sessions of 20 min of 1 mA HD-tDCS targeting the pre-SMA, we documented significant improvements for verbal fluency and naming, and for working memory and executive function tasks that involve the frontal lobes. The effects persisted for up to 14 weeks after completion of HD-tDCS treatment. We also demonstrated normalization of the event-related potentials suggesting modulation of the underlying neural circuit. Our study implicates that region-specific non-invasive brain stimulation, such as HD-tDCS, serves as a potential individualized therapeutic tool to treat cognitive deficits by inducing longer-lasting neuroplasticity even in the chronic phase of TBI.
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Affiliation(s)
- Hsueh-Sheng Chiang
- Department of Neurology, The University of Texas Southwestern Medical Center, Dallas, TX, United States
- School of Behavioral and Brain Sciences, The University of Texas at Dallas, Richardson, TX, United States
| | - Scott Shakal
- Texas College of Osteopathic Medicine, The University of North Texas Health Science Center, Fort Worth, TX, United States
| | | | - Michael Kraut
- Department of Radiology and Radiological Science, The Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - John Hart
- Department of Neurology, The University of Texas Southwestern Medical Center, Dallas, TX, United States
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DeLaRosa BL, Spence JS, Motes MA, To W, Vanneste S, Kraut MA, Hart J. Identification of selection and inhibition components in a Go/NoGo task from EEG spectra using a machine learning classifier. Brain Behav 2020; 10:e01902. [PMID: 33078586 PMCID: PMC7749513 DOI: 10.1002/brb3.1902] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 09/09/2020] [Accepted: 09/28/2020] [Indexed: 02/05/2023] Open
Abstract
INTRODUCTION Prior Go/NoGo studies have localized specific regions and EEG spectra for which traditional approaches have distinguished between Go and NoGo conditions. A more detailed characterization of the spatial distribution and timing of the synchronization of frequency bands would contribute substantially to the clarification of neural mechanisms that underlie performance of the Go/NoGo task. METHODS The present study used a machine learning approach to learn the features that distinguish between ERSPs involved in selection and inhibition in a Go/NoGo task. A single-layer neural network classifier was used to predict task conditions for each subject to characterize ERSPs associated with Go versus NoGo trials. RESULTS The final classifier accurately identified individual task conditions at an overall rate of 92%, estimated by fivefold cross-validation. The detailed accounting of EEG time-frequency patterns localized to brain regions (i.e., thalamus, pre-SMA, orbitofrontal cortex, and superior parietal cortex) corroborates and also elaborates upon previous findings from fMRI and EEG studies, and expands the information about EEG power changes in multiple frequency bands (i.e., primarily theta power increase, alpha decreases, and beta increases and decreases) within these regions underlying the selection and inhibition processes engaged in the Go and NoGo trials. CONCLUSION This time-frequency-based classifier extends previous spatiotemporal findings and provides information about neural mechanisms underlying selection and inhibition processes engaged in Go and NoGo trials, respectively. This neural network classifier can be used to assess time-frequency patterns from an individual subject and thus may offer insight into therapeutic uses of neuromodulation in neural dysfunction.
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Affiliation(s)
- Bambi L DeLaRosa
- School of Brain and Behavioral Sciences, The University of Texas at Dallas, Dallas, TX, USA
| | - Jeffrey S Spence
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, USA
| | - Michael A Motes
- Callier Center - Dallas, The University of Texas at Dallas, TX, USA
| | - Wing To
- Callier Center - Dallas, The University of Texas at Dallas, TX, USA
| | - Sven Vanneste
- Callier Center - Dallas, The University of Texas at Dallas, TX, USA
| | - Michael A Kraut
- Department of Radiology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - John Hart
- Callier Center - Dallas, The University of Texas at Dallas, TX, USA
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Mudar RA, Nguyen LT, Eroh J, Chiang HS, Rackley A, Chapman SB. Event-related neural oscillation changes following reasoning training in individuals with Mild Cognitive Impairment. Brain Res 2019; 1704:229-240. [PMID: 30342001 DOI: 10.1016/j.brainres.2018.10.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 09/17/2018] [Accepted: 10/16/2018] [Indexed: 10/28/2022]
Abstract
Emerging evidence suggests cognitive training programs targeting higher-order reasoning may strengthen not only cognitive, but also neural functions in individuals with Mild Cognitive Impairment (MCI). However, research on direct measures of training-induced neural changes, derivable from electroencephalography (EEG), is limited. The current pilot study examined effects of Gist Reasoning training (n = 16) compared to New Learning training (n = 16) in older adults with amnestic MCI on measures of event-related neural oscillations (theta and alpha band power) corresponding to Go/NoGo tasks during basic and superordinate semantic categorization. EEG data were recorded while participants performed the Go/NoGo task pre- and post-training, and power in theta and alpha frequency bands was examined. Both groups were comparable at pre-training on all measures and both groups showed greater event-related theta synchronization post-training. Furthermore, the Gist Reasoning group had enhanced event-related desynchronization in low-frequency alpha band (8-10 Hz) on response inhibition (NoGo) trials and high-frequency alpha band (11-13 Hz) on response execution (Go) trials during superordinate categorization, relative to the New Learning group. These findings suggest that Gist Reasoning training in MCI impacted neural processing linked to strategic processing of Go and NoGo trials during the more complex superordinate categorization task. Targeting higher-order top-down cognitive processing seems to better harness residual neuroplastic potential in MCI. ClinicalTrials.gov ID: NCT02588209.
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Affiliation(s)
- Raksha A Mudar
- Department of Speech and Hearing Science, University of Illinois at Urbana-Champaign, Champaign, IL, United States; Neuroscience Program, University of Illinois at Urbana-Champaign, Champaign, IL, United States.
| | - Lydia T Nguyen
- Neuroscience Program, University of Illinois at Urbana-Champaign, Champaign, IL, United States
| | - Justin Eroh
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, United States
| | - Hsueh-Sheng Chiang
- Department of Neurology and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Audette Rackley
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, United States
| | - Sandra B Chapman
- Center for BrainHealth, The University of Texas at Dallas, Dallas, TX, United States
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Motes MA, Rao NK, Shokri-Kojori E, Chiang HS, Kraut MA, Hart J. Trial-Level Regressor Modulation for Functional Magnetic Resonance Imaging Designs Requiring Strict Periodicity of Stimulus Presentations: Illustrated Using a Go/No-Go Task. MAGNETIC RESONANCE INSIGHTS 2017; 10:1178623X17746693. [PMID: 29276390 PMCID: PMC5734432 DOI: 10.1177/1178623x17746693] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 11/13/2017] [Indexed: 11/25/2022]
Abstract
Computer-based assessment of many cognitive processes (eg, anticipatory and response readiness processes) requires the use of invariant stimulus display times (SDT) and intertrial intervals (ITI). Although designs with invariant SDTs and ITIs have been used in functional magnetic resonance imaging (fMRI) research, such designs are problematic for fMRI studies because of collinearity issues. This study examined regressor modulation with trial-level reaction times (RT) as a method for improving signal detection in a go/no-go task with invariant SDTs and ITIs. The effects of modulating the go regressor were evaluated with respect to the detection of BOLD signal-change for the no-go condition. BOLD signal-change to no-go stimuli was examined when the go regressor was based on a (a) canonical hemodynamic response function (HRF), (b) RT-based amplitude-modulated (AM) HRF, and (c) RT-based amplitude and duration modulated (A&DM) HRF. Reaction time–based modulation reduced the collinearity between the go and no-go regressors, with A&DM producing the greatest reductions in correlations between the regressors, and greater reductions in the correlations between regressors were associated with longer mean RTs and greater RT variability. Reaction time–based modulation increased statistical power for detecting group-level no-go BOLD signal-change across a broad set of brain regions. The findings show the efficacy of using regressor modulation to increase power in detecting BOLD signal-change in fMRI studies in which circumstances dictate the use of temporally invariant stimulus presentations.
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Affiliation(s)
- Michael A Motes
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA
| | - Neena K Rao
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA
| | - Ehsan Shokri-Kojori
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA
| | - Hsueh-Sheng Chiang
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA
| | - Michael A Kraut
- Department of Radiology, Johns Hopkins University, Baltimore, MD, USA
| | - John Hart
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, TX, USA.,Department of Neurology, University of Texas Southwestern Medical Center, Dallas, TX, USA
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Nguyen LT, Mudar RA, Chiang HS, Schneider JM, Maguire MJ, Kraut MA, Hart J. Theta and Alpha Alterations in Amnestic Mild Cognitive Impairment in Semantic Go/NoGo Tasks. Front Aging Neurosci 2017; 9:160. [PMID: 28588479 PMCID: PMC5440918 DOI: 10.3389/fnagi.2017.00160] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 05/08/2017] [Indexed: 12/29/2022] Open
Abstract
Growing evidence suggests that cognitive control processes are impaired in amnestic mild cognitive impairment (aMCI); however the nature of these alterations needs further examination. The current study examined differences in electroencephalographic theta and alpha power related to cognitive control processes involving response execution and response inhibition in 22 individuals with aMCI and 22 age-, sex-, and education-matched cognitively normal controls. Two Go/NoGo tasks involving semantic categorization were used. In the basic categorization task, Go/NoGo responses were made based on exemplars of a single car (Go) and a single dog (NoGo). In the superordinate categorization task, responses were made based on multiple exemplars of objects (Go) and animals (NoGo). Behavioral data showed that the aMCI group had more false alarms during the NoGo trials compared to controls. The EEG data revealed between group differences related to response type in theta (4–7 Hz) and low-frequency alpha (8–10 Hz) power. In particular, the aMCI group differed from controls in theta power during the NoGo trials at frontal and parietal electrodes, and in low-frequency alpha power during Go trials at parietal electrodes. These results suggest that alterations in theta power converge with behavioral deterioration in response inhibition, whereas alterations in low-frequency alpha power appear to precede behavioral changes in response execution. Both behavioral and electrophysiological correlates combined provide a more comprehensive characterization of cognitive control deficits in aMCI.
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Affiliation(s)
- Lydia T Nguyen
- Neuroscience Program, University of Illinois at Urbana-ChampaignChampaign, IL, United States
| | - Raksha A Mudar
- Neuroscience Program, University of Illinois at Urbana-ChampaignChampaign, IL, United States.,Department of Speech and Hearing Science, University of Illinois at Urbana-ChampaignChampaign, IL, United States
| | - Hsueh-Sheng Chiang
- School of Behavioral and Brain Sciences, The University of Texas at DallasRichardson, TX, United States
| | - Julie M Schneider
- School of Behavioral and Brain Sciences, The University of Texas at DallasRichardson, TX, United States
| | - Mandy J Maguire
- School of Behavioral and Brain Sciences, The University of Texas at DallasRichardson, TX, United States
| | - Michael A Kraut
- Department of Radiology, The Johns Hopkins University School of MedicineBaltimore, MD, United States
| | - John Hart
- School of Behavioral and Brain Sciences, The University of Texas at DallasRichardson, TX, United States
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Effects of age on cognitive control during semantic categorization. Behav Brain Res 2015; 287:285-93. [PMID: 25823764 DOI: 10.1016/j.bbr.2015.03.042] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 03/06/2015] [Accepted: 03/22/2015] [Indexed: 01/10/2023]
Abstract
We used event-related potentials (ERPs) to study age effects of perceptual (basic-level) vs. perceptual-semantic (superordinate-level) categorization on cognitive control using the go/nogo paradigm. Twenty-two younger (11 M; 21 ± 2.2 years) and 22 older adults (9 M; 63 ± 5.8 years) completed two visual go/nogo tasks. In the single-car task (SiC) (basic), go/nogo responses were made based on single exemplars of a car (go) and a dog (nogo). In the object animal task (ObA) (superordinate), responses were based on multiple exemplars of objects (go) and animals (nogo). Each task consisted of 200 trials: 160 (80%) 'go' trials that required a response through button pressing and 40 (20%) 'nogo' trials that required inhibition/withholding of a response. ERP data revealed significantly reduced nogo-N2 and nogo-P3 amplitudes in older compared to younger adults, whereas go-N2 and go-P3 amplitudes were comparable in both groups during both categorization tasks. Although the effects of categorization levels on behavioral data and P3 measures were similar in both groups with longer response times, lower accuracy scores, longer P3 latencies, and lower P3 amplitudes in ObA compared to SiC, N2 latency revealed age group differences moderated by the task. Older adults had longer N2 latency for ObA compared to SiC, in contrast, younger adults showed no N2 latency difference between SiC and ObA. Overall, these findings suggest that age differentially affects neural processing related to cognitive control during semantic categorization. Furthermore, in older adults, unlike in younger adults, levels of categorization modulate neural processing related to cognitive control even at the early stages (N2).
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