High-Frequency γ-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks

Tanji, Kazuyo; Suzuki, Kyoko; Delorme, Arnaud; Shamoto, Hiroshi; Nakasato, Nobukazu

doi:10.1523/jneurosci.4948-04.2005

Cited by 106 publications

(90 citation statements)

References 42 publications

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“…All 2-D correlation images were masked for significant effects at p Ͻ 0.0001. Because of strong correlations of power estimates within a time-frequency neighborhood, we estimated the number of independent comparisons in the 2-D correlation images as 100 (Tanji et al, 2005), so p ϭ 0.0001 (uncorrected) corresponded to p ϭ 0.01 after correction for multiple comparisons (Bonferroni, 1950). [An alternative way to correct for multiple comparisons would have been to use the method developed by Nichols and Holmes (2002)].…”

Section: Methodsmentioning

confidence: 99%

Medial Prefrontal Theta Bursts Precede Rapid Motor Responses during Visual Selective Attention

Delorme¹,

Westerfield²,

Makeig³

2007

J. Neurosci.

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After visual target stimuli presented infrequently at a covertly attended location, quicker speeded button presses immediately followed a larger positive (P3f) ramp in averaged electroencephalographic (EEG) recordings from the forehead. We show this peak in the mean response time locked to the button press to be principally composed of triphasic, primarily low-theta band (4.5 Hz) complexes preceding but only partially phase-locked to the button press, with larger complexes preceding quicker motor responses. For 10 of 15 subjects, independent component analysis of the unaveraged 31-channel data identified a temporally independent medial frontal EEG process contributing to these phenomena. Low-resolution tomographic modeling localized related components of two 253-channel data sets to medial frontal polar cortex (BA32/10). The far-frontal low-theta complexes and concomitant mean P3f positivity may index cortical activity induced by paralimbic processes involved in disinhibiting impulsive motor responses to rewarding or goal-fulfilling stimuli or events.

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Section: Methodsmentioning

confidence: 99%

Medial Prefrontal Theta Bursts Precede Rapid Motor Responses during Visual Selective Attention

Delorme¹,

Westerfield²,

Makeig³

2007

J. Neurosci.

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“…The middle third was adopted as a convenient and inclusive boundary for inclusion of higher-order visual cortex responsible for visual object processing. 23,24 For this analysis, the Wernicke area was defined here as the posterior half of the superior temporal gyrus, supramarginal gyrus, and angular gyrus (blue shaded areas). The Broca area included pars triangularis and pars opercularis of the left inferior frontal gyrus (green shaded areas).…”

Section: Region Of Interest (Roi) Analysis For Each Patient We Per-mentioning

confidence: 99%

Spatial-temporal functional mapping of language at the bedside with electrocorticography

et al. 2016

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Objective: To investigate the feasibility and clinical utility of using passive electrocorticography (ECoG) for online spatial-temporal functional mapping (STFM) of language cortex in patients being monitored for epilepsy surgery.Methods: We developed and tested an online system that exploits ECoG's temporal resolution to display the evolution of statistically significant high gamma (70-110 Hz) responses across all recording sites activated by a discrete cognitive task. We illustrate how this spatial-temporal evolution can be used to study the function of individual recording sites engaged during different language tasks, and how this approach can be particularly useful for mapping eloquent cortex.Results: Using electrocortical stimulation mapping (ESM) as the clinical gold standard for localizing language cortex, the average sensitivity and specificity of online STFM across 7 patients were 69.9% and 83.5%, respectively. Moreover, relative to regions of interest where discrete cortical lesions have most reliably caused language impairments in the literature, the sensitivity of STFM was significantly greater than that of ESM, while its specificity was also greater than that of ESM, though not significantly so. Functional human brain mapping is commonly performed during or prior to invasive brain surgery for the treatment of drug-refractory epilepsy 1,2 and brain tumors. 3 The current gold standard, electrocortical stimulation mapping (ESM), is time-consuming 4,5 and often induces afterdischarges or seizures. 4,6,7 Additionally, it is difficult to rule out distant effects through diaschisis or action potentials evoked by stimulation.7-9 These limitations have long motivated the investigation of passive electrocorticographic (ECoG) recordings as a tool for rapidly and safely mapping cortical function prior to resective surgery. 10-12Here we introduce and test the feasibility and clinical utility of an online trial-based system for spatial-temporal functional mapping (STFM) of language cortex. High-gamma (HG, ; power changes have been demonstrated to be a robust and reliable index of task-related activation of cortical populations of neurons with high spatial and temporal specificity.13,14 The STFM system builds upon previous passive ECoG mapping software [15][16][17][18] by providing a trialbased framework for online display and statistical validation of HG dynamics.In 7 patients, estimates of the system's sensitivity and specificity for language mapping, relative to the benchmark of ESM, were the same or better than previous reports.18-21 Moreover, we found that relative to predefined language cortex boundaries, the sensitivity and specificity of *These authors contributed equally to this work.

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“…These non-phase-locked responses in "high-gamma" frequencies, typically greater than 60 Hz and extending as high as 200 Hz, have been observed during functional activation in a variety of cortical domains, including sensorimotor (Crone et al, 1998a;Ohara et al, 2000;Pfurtscheller et al, 2003;Leuthardt et al, 2004), oculomotor (Lachaux et. al., 2006), auditory (Crone et al, 2001a;Ray et al, 2003;Edwards et al, 2005), visual (Crone et al, 2001b;Lachaux et al, 2005;Tanji et al, 2005), and language (Crone et al, 2001b;Sinai et al, 2005) cortices. However, their correlation with selective attention has not yet been unequivocally established.…”

Section: Introductionmentioning

confidence: 99%

High-frequency gamma activity (80–150Hz) is increased in human cortex during selective attention

Ray

Niebur

Hsiao

et al. 2008

Clinical Neurophysiology

215

163

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Objective: To study the role of gamma oscillations (>30 Hz) in selective attention using subdural electrocorticography (ECoG) in humans. Methods:We recorded ECoG in human subjects implanted with subdural electrodes for epilepsy surgery. Sequences of auditory tones and tactile vibrations of 800 ms duration were presented asynchronously, and subjects were asked to selectively attend to one of the two stimulus modalities in order to detect an amplitude increase at 400 ms in some of the stimuli.Results: Event-related ECoG gamma activity was greater over auditory cortex when subjects attended auditory stimuli and was greater over somatosensory cortex when subjects attended vibrotactile stimuli. Furthermore, gamma activity was also observed over prefrontal cortex when stimuli appeared in either modality, but only when they were attended. Attentional modulation of gamma power began ∼400 ms after stimulus onset, consistent with the temporal demands on attention. The increase in gamma activity was greatest at frequencies between 80 and 150 Hz, in the so-called high gamma frequency range.Conclusions: There appears to be a strong link between activity in the high-gamma range (80-150 Hz) and selective attention.Significance: Selective attention is correlated with increased activity in a frequency range that is significantly higher than what has been reported previously using EEG recordings.

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High-Frequency γ-Band Activity in the Basal Temporal Cortex during Picture-Naming and Lexical-Decision Tasks

Cited by 106 publications

References 42 publications

Medial Prefrontal Theta Bursts Precede Rapid Motor Responses during Visual Selective Attention

Medial Prefrontal Theta Bursts Precede Rapid Motor Responses during Visual Selective Attention

Spatial-temporal functional mapping of language at the bedside with electrocorticography

High-frequency gamma activity (80–150Hz) is increased in human cortex during selective attention

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