Development of MEG data recording and signal processing methods has been very successful. Studies of working memory tasks and auditory processing tasks have shown the ability to localize brain activation and to address issues of phasic versus tonic activity. We are investigating phenotype measures that will be applicable in many related studies and specifically the sibling project. MEG recording during cognitive activation has shown the ability to localize in very comparable fashion to fMRI. Specifically beta desynchronization at the cortical level has been found to agree with BOLD activation results. However, the MEG/EEG allows for temporal information not possible with other imaging techniques. Phasic relationships across brain areas have been demonstrated using advanced signal processing techniques. Our results show that measures of brain structure and function represent powerful tools to find susceptibility genes. Further studies have demonstrated the ability to localize signals in deeper structures such as the amygdala and to investigate the relation of visual awareness to gamma band signals. We have also found that GABA (gamma-aminobutyric acid) concentration in the anterior cingulate cortex correlates with spatially localized resting MEG beta band power. We expect that further investigation will reveal addtional relationships between gamma power and GABA systems. Diffrerences in the degree of activation especially in frontal regions as indexed by beta desynchronization during a working memory task have been found between patients with schizophrenia compared to well siblings and normal control volunteers. Further investigation of this activation has revealed an interaction with genotype for the well studied COMT marker. We have found there is a modulation of prefrontal cortex activity that occurs in anticipation of the upcoming task demands. We have extended this analysis to a well matched set of patients, siblings and controls. When working memory task perfomance is controlled patients show a distinct reduced DLPFC activation in apparent distinction to increased BOLD relative to task load. The MEG analysis isolates a working memory component that may reflect a different aspect of cortical processing. Differences in network patterns and dynamics are key to understanding underlying pathology in clinical groups. Bassett et al have shown that functional network differences in patient groups can be demonstrated and related to behavioral outcomes on cognitive activities. Rutter et al have shown that even at rest patients with schizophrenia have gamma power reduction compared to normal subjects. It remains to be seen whether these finding relate to state or trait differences and if there are genetic associations. We have found distinct patterns of the temporal sequence of brain regions involved in these memory tasks that show a variety of individual differences across subjects. Recent work with face recognition tasks has shown a distinct network of regions that indicates a cross coupling of oscillatory activity that may lead to better understanding of regional interactions. Recent work has sought to examine whether reorganization of functional brain networks can be seen in response to cognitive remediation strategies. A study of MEG recorded before and after auditory task training in both patients and healthy controls addressed this question. We were able to show significant changes in power and coherence in brain activity that were asociated with improved behavioral performance. This could form the basis of a biomarker that would allow tracking the outcome of remediation strategies targeting specific cognitive deficits in neuropsychiatric disorders.

Project Start
Project End
Budget Start
Budget End
Support Year
6
Fiscal Year
2012
Total Cost
$1
Indirect Cost
Name
U.S. National Institute of Mental Health
Department
Type
DUNS #
City
State
Country
Zip Code
Altamura, Mario; Elvevåg, Brita; Goldberg, Terry E et al. (2016) The impact of Val108/158Met polymorphism of catechol-O-methyltransferase on brain oscillations during working memory. Neurosci Lett 610:86-91
Jabbi, Mbemba; Kohn, Philip D; Nash, Tiffany et al. (2015) Convergent BOLD and Beta-Band Activity in Superior Temporal Sulcus and Frontolimbic Circuitry Underpins Human Emotion Cognition. Cereb Cortex 25:1878-88
Altamura, Mario; Carver, Frederick W; Elvevag, Brita et al. (2014) Dynamic cortical involvement in implicit anticipation during statistical learning. Neurosci Lett 558:73-7
Rutter, Lindsay; Nadar, Sreenivasan R; Holroyd, Tom et al. (2013) Graph theoretical analysis of resting magnetoencephalographic functional connectivity networks. Front Comput Neurosci 7:93
Siebenhuhner, Felix; Weiss, Shennan A; Coppola, Richard et al. (2013) Intra- and inter-frequency brain network structure in health and schizophrenia. PLoS One 8:e72351
Jabbi, M; Nash, T; Kohn, P et al. (2013) Midbrain presynaptic dopamine tone predicts sustained and transient neural response to emotional salience in humans: fMRI, MEG and FDOPA PET. Mol Psychiatry 18:4-6
Shriki, Oren; Alstott, Jeff; Carver, Frederick et al. (2013) Neuronal avalanches in the resting MEG of the human brain. J Neurosci 33:7079-90
Furl, Nicholas; Coppola, Richard; Averbeck, Bruno B et al. (2013) Cross-Frequency Power Coupling Between Hierarchically Organized Face-Selective Areas. Cereb Cortex :
Ledberg, Anders; Montagnini, Anna; Coppola, Richard et al. (2012) Reduced variability of ongoing and evoked cortical activity leads to improved behavioral performance. PLoS One 7:e43166
Carver, Frederick W; Elvevag, Brita; Altamura, Mario et al. (2012) The neuromagnetic dynamics of time perception. PLoS One 7:e42618

Showing the most recent 10 out of 17 publications