Supratim Ray

Intracranial characterization of gamma in humans in response to auditory gratings

The paper investigates gamma activity in response to auditory gratings in humans using EEG and invasive recordings, finding broadband gamma activity rather than narrowband oscillations.

Transcranial direct and alternating current stimulation produce distinct long-lasting changes in macaque V1 stimulus-induced gamma

This study compares the effects of tDCS and tACS on gamma oscillations in macaque V1, finding lasting changes in power and connectivity.

Open-eyed meditation suppresses functional connectivity in EEG across a broad frequency range

This study shows meditation reduces functional connectivity across a broad frequency range in EEG, while aging and gender have narrower frequency-specific effects, and average referencing distorts FC estimates.

Gamma oscillations across recording scales show a preference for saturated long-wavelength (reddish) hues in the primate visual cortex

The paper shows that gamma oscillations in primate V1 are strongest for saturated reddish hues, driven by L-M cone contrast, and diminish in desaturated colors and macro-scale recordings.

Differential Burst dynamics of Slow and Fast gamma rhythms in Macaque primary visual cortex

The paper analyzes burst dynamics of slow and fast gamma rhythms in macaque V1, finding longer durations and latencies for slow gamma, supported by a computational model.

Slow-varying normalization explains auditory steady-state masking interactions in human EEG

This study investigates auditory steady-state masking interactions in human EEG and finds that a slow-varying normalization model explains the suppression patterns observed with closely spaced modulation frequencies.

Stimulus-induced gamma sources reduce in power but not in spatial extent with healthy aging in human EEG

The paper examines how stimulus-induced gamma sources change with healthy aging in EEG, finding reduced power but not spatial extent.

Slow-varying normalization explains diverse temporal frequency masking interactions across scales in the macaque visual cortex

The paper shows that a simple low-pass filter in normalization explains diverse temporal frequency masking effects in macaque V1 across scales.

Burst Estimation through Atomic Decomposition (BEAD): A Toolbox to find Oscillatory Bursts in Brain Signals

The paper introduces BEAD, a toolbox for detecting oscillatory bursts in brain signals, showing improved performance over traditional methods in synthetic and real data.

Delayed accumulation of inhibitory input explains gamma frequency variation with changing contrast in an Inhibition Stabilized Network

The paper tests a hypothesis that delayed inhibitory input explains gamma frequency changes with contrast in a visual cortex model and confirms it with primate recordings.

Slow and fast gamma oscillations show phase-amplitude coupling with distinct high-frequency bands in macaque primary visual cortex

The paper investigates phase-amplitude coupling in slow and fast gamma oscillations in macaque V1, finding distinct high-frequency coupling patterns for each.

Simultaneously induced slow and fast gamma waves travel independently in primate primary visual cortex

The paper shows that slow and fast gamma waves in primate V1 travel independently with distinct directions and durations, indicating separate neural circuits.

Dissociation of attentional state and behavioral outcome using local field potentials

The paper distinguishes attentional state and behavioral outcome using LFP power and phase in monkeys performing a visual attention task.

Gamma responses to colored natural stimuli can be predicted from local low-level stimulus features

The paper predicts gamma responses to natural images using a model based on local low-level stimulus features like gratings and hue patches.

Changes in Higuchi's fractal dimension across age in healthy human EEG are anti-correlated with changes in oscillatory power and 1/f slope

This study examines age-related changes in Higuchi's fractal dimension (HFD) in EEG data and finds it anti-correlated with oscillatory power and 1/f slope changes, suggesting HFD captures non-linear dynamics not captured by spectral analysis.

Auditory and visual gratings elicit distinct gamma responses

The paper investigates whether auditory ripple stimuli can elicit narrowband gamma oscillations similar to visual gratings, finding instead that they produce broadband high-gamma responses.

Enhanced stimulus-induced and stimulus-free gamma in open-eye meditators

The paper finds that open-eye meditators show stronger stimulus-induced and stimulus-free gamma oscillations compared to controls.

Alpha and SSVEP power outperform Gamma power in capturing Attentional Modulation in Human EEG

This study compares alpha, SSVEP, and gamma power in human EEG to determine their effectiveness in capturing attentional modulation, finding alpha and SSVEP are comparable while gamma is less effective for non-foveal stimuli.

Temporal characteristics of gamma rhythm constrain properties of noise in an inhibition-stabilized network model

The paper shows that OU noise in a Wilson-Cowan model replicates gamma rhythm dynamics and stimulus dependencies, suggesting constraints on neural noise properties.

Slope of the power spectral density flattens at low frequencies (200 Hz) in human electroencephalogram

The paper examines the slope of the power spectral density in EEG signals and finds that the slope flattens with age at low frequencies but steepens at higher frequencies, with no significant difference in MCI/AD subjects compared to controls.

Healthy aging and cognitive impairment alter EEG functional connectivity in distinct frequency bands

The paper examines how healthy aging and mild cognitive impairment affect EEG functional connectivity in different frequency bands, finding distinct changes in power and connectivity patterns.

Stimulus-induced narrow-band gamma oscillations in humans can be recorded using open-hardware low-cost EEG amplifier

This study shows low-cost open-source EEG amplifiers can detect stimulus-induced gamma oscillations in humans, comparable to research-grade equipment.

Gamma oscillations in primate primary visual cortex are severely attenuated by small stimulus discontinuities

The paper shows that gamma oscillations in primate visual cortex decrease with small stimulus discontinuities, suggesting gamma reflects excitation-inhibition balance.

Local interactions between steady-state visually evoked potentials at nearby flickering frequencies

The paper investigates how steady-state visually evoked potentials (SSVEP) responses are modulated by competing stimuli in human and monkey data, revealing local interactions between different flicker frequencies.

Shape analysis of gamma rhythm supports a superlinear inhibitory regime in an inhibition-stabilized network

The paper analyzes the shape of gamma rhythm in V1 to determine the operating regime of inhibition-stabilized networks, finding a superlinear inhibitory regime is required to replicate the observed waveform.

Stimulus-induced narrowband gamma oscillations are test-retest reliable in healthy elderly in human EEG

This study shows that stimulus-induced gamma oscillations in EEG are reliable across test-retest intervals in healthy elderly, suggesting their potential as a biomarker for early AD diagnosis and subject identification.

Decoding of attentional state using high-frequency local field potential is as accurate as using spikes

The paper shows that high-frequency LFP power can decode attentional states as accurately as spikes, even with multiple electrodes.

Gamma oscillations weaken with age in healthy elderly in human EEG

This study examines gamma oscillations in elderly humans and finds age-related decreases in power and center frequency, but not alpha power, suggesting potential biomarkers for cognitive decline.

Comparison of tuning properties of gamma and high-gamma power in local field potential (LFP) versus electrocorticogram (ECoG) in visual cortex

The paper compares gamma and high-gamma power tuning properties in LFP and ECoG in visual cortex and finds they are similar, suggesting ECoG has local origins and is more like LFP than EEG.