Cortical gamma oscillations: the functional key is activation, not cognition

  title={Cortical gamma oscillations: the functional key is activation, not cognition},
  author={Bjorn H. Merker},
  journal={Neuroscience \& Biobehavioral Reviews},
  • B. Merker
  • Published 1 March 2013
  • Biology
  • Neuroscience & Biobehavioral Reviews

Cortical Gamma Oscillations: Details of Their Genesis Preclude a Role in Cognition

Gamma oscillations are shown to be precluded from performing cognitive operations by the specifics of how their underlying physiology balances excitation with inhibition, similar to how the BOLD signal covaries with cognitive variables.

Do cortical gamma oscillations promote or suppress perception? An under-asked question with an over-assumed answer

This review considers two classes of gamma oscillations: “broadband” and “narrowband,” which have very different properties (and likely roles) and discusses studies on Gamma oscillations that are non-discriminatory, followed by studies that specifically support specifically a positive or negative role.

Gamma oscillations and information binding process

The functions of Gamma oscillations in information-binding process have been described in several theoretical frameworks, including Neural Coupling model and Match & Utilization model, however, extreme caution should be exercised when gamma oscillations were applied as an index of binding process.

Functions of gamma‐band synchronization in cognition: from single circuits to functional diversity across cortical and subcortical systems

It is concluded that gamma‐band oscillations support multiple cognitive processes, rather than a single one, which can be traced back to a limited set of circuit motifs which are found universally across species and brain structures.

Assessing Neuronal Synchrony and Brain Function Through Local Field Potential and Spike Analysis

The results herein are intended to bolster the communication through coherence hypothesis and explore new ways in which oscillations coordinate neuronal communication in distributed regions, including the development of new analytic tools for interpreting electrophysiological patterns, inspired by phase synchronization and spike train analysis.

Input-Dependent Frequency Modulation of Cortical Gamma Oscillations Shapes Spatial Synchronization and Enables Phase Coding

It is found that the gamma-mediated temporal organization could be reduced to basic synchronization principles of weakly coupled oscillators, where input drive determines the intrinsic (natural) frequency of oscillators.

Waves of Binding: Neural Oscillations of Visual, Auditory, and Lexical Integration

If our conceptual knowledge about concrete objects is represented (in part) across the brain regions that are active when those objects are perceived, how is information from those regions

EEG oscillations: From correlation to causality.

The impact of cognitive training on spontaneous gamma oscillations in schizophrenia.

The results indicate that abnormal oscillatory dynamics in schizophrenia patients manifested in spontaneous gamma activity can be changed with neuroplasticity-oriented training parallel to cognitive performance.



The roles of gamma-band oscillatory synchrony in human visual cognition.

The recent discovery that gamma oscillations could appear simultaneously in distinct areas at distinct frequencies and with different functional correlates further suggests the existence of a flexible multiplexing schema, integrating frequency bands within the gamma range but also at lower frequency bands.

Neurophysiological and computational principles of cortical rhythms in cognition.

A plethora of studies will be reviewed on the involvement of long-distance neuronal coherence in cognitive functions such as multisensory integration, working memory, and selective attention, and implications of abnormal neural synchronization are discussed as they relate to mental disorders like schizophrenia and autism.

Neural Synchrony in Cortical Networks: History, Concept and Current Status

Evidence is presented that indicates that in addition to supporting conscious cognition, neural synchrony is abnormal in major brain disorders, such as schizophrenia and autism spectrum disorders.

Perception's shadow: long-distance synchronization of human brain activity

It is shown for the first time, to the knowledge, that only face perception induces a long-distance pattern of synchronization, corresponding to the moment of perception itself and to the ensuing motor response.

Gamma coherence and conscious perception

BackgroundHigh-frequency (e.g., gamma 30 to 50 Hz) coherent neural activity has been postulated to underlie binding of independent neural assemblies and thus integrate processing across distributed

Multiple origins of the cortical gamma rhythm

It is concluded that most massively parallel brain regions have different mechanisms of gamma rhythm generation, that different mechanisms have distinct functional correlates, and that switching between different local modes of gamma generation may be an effective way to direct cortical communication streams.

Frequency of gamma oscillations routes flow of information in the hippocampus

The results point to routeing of information as a possible function of gamma frequency variations in the brain and provide a mechanism for temporal segregation of potentially interfering information from different sources.

Gamma oscillations dynamically couple hippocampal CA3 and CA1 regions during memory task performance

It is proposed that gamma oscillations may serve as a physiological mechanism by which CA3 output can coordinate CA1 activity to support retrieval of hippocampus-dependent memories.

Olfactory system gamma oscillations: the physiological dissection of a cognitive neural system

A summary of what has been learned about the functional role and mechanisms of gamma oscillations in the olfactory system as a guide for similar studies in other cortical systems is presented.

Visuomotor integration is associated with zero time-lag synchronization among cortical areas

When cats responded to a sudden change of a visual pattern, neuronal activity in cortical areas exhibited synchrony without time lags; this synchrony was particularly strong between areas subserving related functions.