Phase offset determines alpha modulation of gamma phase coherence and hence signal transmission

Greenwood, Priscilla E.; Ward, Lawrence M.

doi:10.1016/j.biosystems.2022.104729

Cited by 3 publications

(31 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Again, in this study, an optimal phase difference was discovered; in this case [21] where the gamma oscillations were quasi-cycles and the alpha oscillations were noisy sine waves. The bottom part of the figure, 'GW22 quasi-cycle gamma and alpha,' displays results from Fig 4 of [21] where both gamma and alpha oscillations were quasi-cycles. The gamma phase offsets (not shown) are different for the two cases: −π/2 for the results in the top part and 0 for the results in the bottom part, respectively.…”

Section: Phase Difference and Attentionmentioning

confidence: 64%

“…As mentioned, these results closely mirror those of [20], but with quasi-cycle oscillations rather than populations of spiking neuron models and sine waves. These results of [21] suggest that it is the oscillations that are essential in this situation, rather than the details of the neuron spiking that causes the oscillations. The rate model in [21] has no spiking, only oscillations, but retains the results of [20].…”

Section: Phase Difference and Attentionmentioning

confidence: 93%

“…These results of [21] suggest that it is the oscillations that are essential in this situation, rather than the details of the neuron spiking that causes the oscillations. The rate model in [21] has no spiking, only oscillations, but retains the results of [20].…”

Section: Phase Difference and Attentionmentioning

confidence: 93%

“…Intrigued by this finding, Greenwood and Ward [21] wondered what was special about −π/2. They proved a lemma that showed that, in fact, phase coherence between summed sine waves, say α 1 + γ 1 and α 2 + γ 2 , similar to those in the study of [20], was maximum when the phase difference in radians, ∆φ, between α 1 and α 2 equalled that between γ 1 and γ 2 , i.e., in the case of the results of [20], −π/2.…”

Section: Phase Difference and Attentionmentioning

confidence: 99%

“…Thus, the maximum phase coherence and signal onset effects occur near −π/2 in the top part and near 0 in the bottom part. Reproduced from [21] with permission.…”

Section: Phase Difference and Attentionmentioning

confidence: 99%

See 4 more Smart Citations

Attentional selection and communication through coherence: Scope and limitations

Greenwood,

Ward

2023

Preprint

Self Cite

View full text Add to dashboard Cite

Synchronous neural oscillations are strongly associated with a variety of perceptual, cognitive, and behavioural processes. It has been proposed that the role of the synchronous oscillations in these processes is to facilitate information transmission between brain areas, the 'communication through coherence' or CTC hypothesis. The details of how this mechanism would work, however, and its causal status, are still unclear. Here we investigate computationally a proposed mechanism for selective attention that directly implicates the CTC as causal. The mechanism involves alpha band (about 10 Hz) oscillations, originating in the pulvinar nucleus of the thalamus, being sent to communicating cortical areas, organizing gamma (about 40 Hz) oscillations there, and thus facilitating phase coherence and communication between them. This is proposed to happen contingent on control signals sent from higher-level cortical areas to the thalamic reticular nucleus, which controls the alpha oscillations sent to cortex by the pulvinar. We studied the scope of this mechanism in parameter space, and limitations implied by this scope, using a computational implementation of our conceptual model. Our results indicate that, although the CTC-based mechanism can account for some effects of top-down and bottom-up attentional selection, its limitations indicate that an alternative mechanism, in which oscillatory coherence is caused by communication between brain areas rather than being a causal factor for it, might operate in addition to, or even instead of, the CTC mechanism.

show abstract

Section: Phase Difference and Attentionmentioning

confidence: 64%

Section: Phase Difference and Attentionmentioning

confidence: 93%

Section: Phase Difference and Attentionmentioning

confidence: 93%

Section: Phase Difference and Attentionmentioning

confidence: 99%

“…Thus, the maximum phase coherence and signal onset effects occur near −π/2 in the top part and near 0 in the bottom part. Reproduced from [21] with permission.…”

Section: Phase Difference and Attentionmentioning

confidence: 99%

See 3 more Smart Citations

Attentional selection and communication through coherence: Scope and limitations

Greenwood,

Ward

2023

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

Editorial: Selected papers from the 14th international neural coding workshop, Seattle, Washington

et al. 2023

View full text Add to dashboard Cite

Attentional selection and communication through coherence: Scope and limitations

Greenwood,

Ward

2024

PLoS Comput Biol

View full text Add to dashboard Cite

Synchronous neural oscillations are strongly associated with a variety of perceptual, cognitive, and behavioural processes. It has been proposed that the role of the synchronous oscillations in these processes is to facilitate information transmission between brain areas, the ‘communication through coherence,’ or CTC hypothesis. The details of how this mechanism would work, however, and its causal status, are still unclear. Here we investigate computationally a proposed mechanism for selective attention that directly implicates the CTC as causal. The mechanism involves alpha band (about 10 Hz) oscillations, originating in the pulvinar nucleus of the thalamus, being sent to communicating cortical areas, organizing gamma (about 40 Hz) oscillations there, and thus facilitating phase coherence and communication between them. This is proposed to happen contingent on control signals sent from higher-level cortical areas to the thalamic reticular nucleus, which controls the alpha oscillations sent to cortex by the pulvinar. We studied the scope of this mechanism in parameter space, and limitations implied by this scope, using a computational implementation of our conceptual model. Our results indicate that, although the CTC-based mechanism can account for some effects of top-down and bottom-up attentional selection, its limitations indicate that an alternative mechanism, in which oscillatory coherence is caused by communication between brain areas rather than being a causal factor for it, might operate in addition to, or even instead of, the CTC mechanism.

show abstract

Phase offset determines alpha modulation of gamma phase coherence and hence signal transmission

Cited by 3 publications

References 31 publications

Attentional selection and communication through coherence: Scope and limitations

Attentional selection and communication through coherence: Scope and limitations

Editorial: Selected papers from the 14th international neural coding workshop, Seattle, Washington

Attentional selection and communication through coherence: Scope and limitations

Contact Info

Product

Resources

About