Oscillatory synchrony as a mechanism of attentional processing

Gregoriou, Georgia G.; Paneri, Sofia; Sapountzis, Panagiotis

doi:10.1016/j.brainres.2015.02.004

Cited by 46 publications

(38 citation statements)

References 188 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These earlier results from macaques agree fully with the present results for humans in the gamma band, but they agree only partly in the other frequency bands. Our present analysis in humans suggests that top-down influences are exerted by rhythms spanning alpha and beta frequency ranges, even though previous studies clearly suggest separate alpha and beta rhythms (Wang, 2010; Womelsdorf et al, 2014; Gregoriou et al, 2015). It is important to note that our analysis merely reveals whether directed influences in a frequency band relate to feedforward or feedback projections.…”

Section: Discussioncontrasting

confidence: 81%

“…Average inter-areal GC exceeded the bias estimate across the spectrum and showed two clear peaks, one in the alpha-beta range, peaking at 11 Hz, and one in the gamma band, peaking around 60 Hz. Previous studies have shown clear differences between alpha and beta rhythms (Wang, 2010; Bressler and Richter, 2014; Haegens et al, 2014; Gregoriou et al, 2015), however, the present analysis revealed one peak spanning across alpha and beta frequency ranges (similar to (Buffalo et al, 2011)), which we therefore refer to as the alpha-beta band. Peak frequencies were essentially identical in the two hemispheres.…”

Section: Resultscontrasting

confidence: 62%

See 1 more Smart Citation

Alpha-Beta and Gamma Rhythms Subserve Feedback and Feedforward Influences among Human Visual Cortical Areas

Michalareas

Vezoli

Pelt

et al. 2016

Neuron

654

120

676

View full text Add to dashboard Cite

Primate visual cortex is hierarchically organized. Bottom-up and top-down influences are exerted through distinct frequency channels, as was recently revealed in macaques by correlating inter-areal influences with laminar anatomical projection patterns. Because this anatomical data cannot be obtained in human subjects, we selected seven homologous macaque and human visual areas, and correlated the macaque laminar projection patterns to human inter-areal directed influences as measured with magnetoencephalography. We show that influences along feedforward projections predominate in the gamma band, whereas influences along feedback projections predominate in the alpha-beta band. Rhythmic inter-areal influences constrain a functional hierarchy of the seven homologous human visual areas that is in close agreement with the respective macaque anatomical hierarchy. Rhythmic influences allow an extension of the hierarchy to 26 human visual areas including uniquely human brain areas. Hierarchical levels of ventral and dorsal stream visual areas are differentially affected by inter-areal influences in the alpha-beta band.

show abstract

Section: Discussioncontrasting

confidence: 81%

Section: Resultscontrasting

confidence: 62%

Alpha-Beta and Gamma Rhythms Subserve Feedback and Feedforward Influences among Human Visual Cortical Areas

Michalareas

Vezoli

Pelt

et al. 2016

Neuron

654

120

676

View full text Add to dashboard Cite

show abstract

“…As discussed, mPFC plays a key role in attention. However, optimal attentional performance requires neuronal synchrony between mPFC and other cortical and subcortical structures [Gregoriou, Paneri, & Sapountzis, 2015;Miller & Buschman, 2013]. Studies on autistic individuals and their siblings suggest reduced gamma synchrony between functionally connected brain regions associated with compromised perceptual functions [Rojas & Wilson, 2014;Uhlhaas & Singer, 2006].…”

Section: Mechanisms That Could Explain Altered Attentional Abilities mentioning

confidence: 99%

Altered attentional processing in male and female rats in a prenatal valproic acid exposure model of autism spectrum disorder

et al. 2017

View full text Add to dashboard Cite

We studied rats prenatally exposed to valproic acid (VPA), an established rodent model of autism. Both male and female VPA rats had a range of attentional impairments with sex-specific characteristics. Importantly, with fixed rules, graded difficulty levels, and more time, VPA rats could be successfully trained on the attentional task. Our work validates the use of the VPA model in the quest for evaluating suitable therapeutic targets for improving attentional performance.

show abstract

“…Whether ING or PING mechanisms underlie oscillations in the visual cortex is still debated and might depend on task requirements (Tiesinga and Sejnowski 2009;Isaacson and Scanziani 2011;Buzsáki and Wang 2012;Gregoriou et al 2015), but a combination of both seems most likely, considering the local connectivity structure (Haeusler and Maass 2007). In the current study, we focused on a "pure" ING-mechanism (no connections between excitatory and from excitatory to inhibitory subpopulations).…”

Section: Discussionmentioning

confidence: 99%

A model for attentional information routing through coherence predicts biased competition and multistable perception

Harnack

Ernst

Pawelzik

2015

Journal of Neurophysiology

View full text Add to dashboard Cite

Harnack D, Ernst UA, Pawelzik KR. A model for attentional information routing through coherence predicts biased competition and multistable perception. J Neurophysiol 114: 1593-1605. First published June 24, 2015 doi:10.1152/jn.01038.2014.-Selective attention allows to focus on relevant information and to ignore distracting features of a visual scene. These principles of information processing are reflected in response properties of neurons in visual area V4: if a neuron is presented with two stimuli in its receptive field, and one is attended, it responds as if the nonattended stimulus was absent (biased competition). In addition, when the luminance of the two stimuli is temporally and independently varied, local field potentials are correlated with the modulation of the attended stimulus and not, or much less, correlated with the nonattended stimulus (information routing). To explain these results in one coherent framework, we present a two-layer spiking cortical network model with distancedependent lateral connectivity and converging feed-forward connections. With oscillations arising inherently from the network structure, our model reproduces both experimental observations. Hereby, lateral interactions and shifts of relative phases between sending and receiving layers (communication through coherence) are identified as the main mechanisms underlying both biased competition as well as selective routing. Exploring the parameter space, we show that the effects are robust and prevalent over a broad range of parameters. In addition, we identify the strength of lateral inhibition in the first model layer as crucial for determining the working regime of the system: increasing lateral inhibition allows a transition from a network configuration with mixed representations to one with bistable representations of the competing stimuli. The latter is discussed as a possible neural correlate of multistable perception phenomena such as binocular rivalry. biased competition; multistable perception; coherence; attention; routing IT IS A WIDESPREAD BELIEF that the brain has limited resources available for information processing (Marois and Ivanoff 2005). Selective attention provides a means of efficient and flexible operation under this restriction by allowing preferential allocation of processing resources to a particular area or feature in the visual scenery while ignoring distractors.Hints towards the mechanisms selective attention employs are provided by two seminal studies. By showing a preferred and a nonpreferred stimulus at separate spatial locations to a V4 neuron, Moran and Desimone (1985) discovered that presenting both at the same time results in an averaged rate between the rates the stimuli would elicit if presented alone. Attending one stimulus biased the response towards the rate the attended stimulus would evoke if presented alone (biased competition). These results suggest that attention selectively modulates the information flow through the visual hierarchy. Grothe et al. (2015) tested this hypothesis dire...

show abstract

Oscillatory synchrony as a mechanism of attentional processing

Cited by 46 publications

References 188 publications

Alpha-Beta and Gamma Rhythms Subserve Feedback and Feedforward Influences among Human Visual Cortical Areas

Alpha-Beta and Gamma Rhythms Subserve Feedback and Feedforward Influences among Human Visual Cortical Areas

Altered attentional processing in male and female rats in a prenatal valproic acid exposure model of autism spectrum disorder

A model for attentional information routing through coherence predicts biased competition and multistable perception

Contact Info

Product

Resources

About