Parieto-occipital ∼1 0Hz activity reflects anticipatory state of visual attention mechanisms

Foxe, John J.; Simpson, Gregory V.; Ahlfors, Seppo P.

doi:10.1097/00001756-199812010-00030

Cited by 497 publications

(506 citation statements)

References 15 publications

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“…α-rhythms originating in the occipital region are associated with visual attention processes (e.g. Foxe et al, 1998) while α-rhythms generated by the sensorimotor cortex are related to motor processes (e.g. Hari et al, 1998).…”

Section: Eeg Data Acquisition and Preparationmentioning

confidence: 99%

Transcranial alternating current stimulation to the inferior parietal lobe decreases mu suppression to egocentric, but not allocentric hand movements

2017

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Egocentric vs. allocentric perspective during observation of hand movements has been related to self-other differentiation such that movements observed from an egocentric viewpoint have been considered as self-related while movements observed from an allocentric viewpoint have been considered as belonging to someone else. Correlational studies have generally found that egocentric perspective induces greater neurophysiological responses and larger behavioural effects compared to an allocentric perspective. However, recent studies question previous findings by reporting greater () suppression and greater transcranial magnetic stimulation (TMS) induced motor-evoked potentials (MEPs) during observation of allocentric compared to egocentric movements. Furthermore, selfother differentiation has been generally related to activity within the inferior parietal lobe (IPL), but direct evidence for a causal and functional role of IPL in self-other differentiation is lacking. The current study was therefore designed to investigate the influence that IPL exerts on self-other differentiation. To this aim, we measured the impact of individually adjusted alpha-tuned transcranial alternating current stimulation (tACS) applied over IPL on -suppression during hands movement observation from an egocentric and allocentric perspective. Electroencephalography (EEG) was recorded during movement observation before and immediately after tACS. Results demonstrated that tACS decreased -reactivity over sensorimotor (but not visual) regions for egocentric (but not allocentric) movement observation providing direct evidence for a causal involvement of IPL in the observation of selfbut not other-related hands movement.

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Section: Eeg Data Acquisition and Preparationmentioning

confidence: 99%

Transcranial alternating current stimulation to the inferior parietal lobe decreases mu suppression to egocentric, but not allocentric hand movements

2017

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“…EROs in the alpha band (B10 Hz) were found to increase with memory load during the delay interval in a working memory task [9,13]. This increase in 10 Hz activity has been interpreted as a correlate of a cortical inhibition of taskirrelevant neural processes [14][15][16]. While most of these studies employed only single-featured objects, Klaver et al [11] used multi-featured objects to investigate the effect of feature-load on ERPs during encoding and retention and failed to find an effect of feature-load.…”

Section: Introductionmentioning

confidence: 97%

Object-load and feature-load modulate EEG in a short-term memory task

Busch¹,

Herrmann²

2003

NeuroReport

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Behavioral studies have indicated that multiple features of one object can be stored in working memory without additional costs. In contrast, visual search experiments revealed that search for a multi-featured object takes more time than for a single-featured object. We used EEG to di¡erentiate the e¡ect of object-load and feature-load in a short-term memory task. We independently varied the amount of objects and features that had to be memorized. Object-load modulated P3 amplitude during encoding and induced 10 Hz oscillations during the retention interval. Feature-load modulated the P3 during retrieval. Thus, only object-load seemed to in£uence encoding and retention while feature-load played a crucial role during retrieval. Our results demonstrate that objectload and feature-load in£uence short-term memory at di¡erent stages.

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“…In particular, α-activity might serve to shape the state of sensory brain regions to direct the flow of information and optimize performance (8). In support of this idea, several studies on visual perception have shown that anticipatory α-activity reflects the orienting of attention (9)(10)(11)(12)(13)(14) and influences detection performance (15)(16)(17). Recently, it was shown that the functionality of α-oscillations can be generalized to the somatosensory system (18)(19)(20)(21).…”

mentioning

confidence: 94%

α-Oscillations in the monkey sensorimotor network influence discrimination performance by rhythmical inhibition of neuronal spiking

Haegens

Nácher

Luna

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

684

627

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Extensive work in humans using magneto-and electroencephalography strongly suggests that decreased oscillatory α-activity (8-14 Hz) facilitates processing in a given region, whereas increased α-activity serves to actively suppress irrelevant or interfering processing. However, little work has been done to understand how α-activity is linked to neuronal firing. Here, we simultaneously recorded local field potentials and spikes from somatosensory, premotor, and motor regions while a trained monkey performed a vibrotactile discrimination task. In the local field potentials we observed strong activity in the α-band, which decreased in the sensorimotor regions during the discrimination task. This α-power decrease predicted better discrimination performance. Furthermore, the α-oscillations demonstrated a rhythmic relation with the spiking, such that firing was highest at the trough of the α-cycle. Firing rates increased with a decrease in α-power. These findings suggest that α-oscillations exercise a strong inhibitory influence on both spike timing and firing rate. Thus, the pulsed inhibition by α-oscillations plays an important functional role in the extended sensorimotor system.T he prominent posterior α-rhythm (8-14 Hz) was first described by Hans Berger (1) and long considered to reflect cortical idling (2, 3). To a large extent, the α-rhythm has been ignored by animal neurophysiologists (but see ref. 4) and considered to be of little functional relevance. Thus, it remains largely unknown how ongoing α-oscillations relate to neuronal firing.In contrast to the idling hypothesis, converging electrophysiological evidence in humans suggests that α-oscillations play an important functional role in cognitive processing (5-7). In particular, α-activity might serve to shape the state of sensory brain regions to direct the flow of information and optimize performance (8). In support of this idea, several studies on visual perception have shown that anticipatory α-activity reflects the orienting of attention (9-14) and influences detection performance (15-17). Recently, it was shown that the functionality of α-oscillations can be generalized to the somatosensory system (18-21). Furthermore, α-activity has been implicated in visual (22-25), auditory (26), and somatosensory working-memory performance (27).These studies strongly suggest that decreased α-activity facilitates processing in task-relevant brain regions, whereas increased α-activity functions to suppress distracting input in task-irrelevant regions. However, given the strong oscillatory nature of the α-activity, it is less clear how it influences processing in a phasic manner. It has been suggested that α-oscillations serve to depress processing every ∼100 ms by a mechanism of pulsed inhibition (5,(28)(29)(30). In support of this notion, it has recently been demonstrated that perception is modulated by the prestimulus phase of the α-rhythm (31, 32). Likewise, it was recently shown that the magnitude of the blood-oxygen level-dependent signal in response to a visual...

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Parieto-occipital ∼1 0Hz activity reflects anticipatory state of visual attention mechanisms

Cited by 497 publications

References 15 publications

Transcranial alternating current stimulation to the inferior parietal lobe decreases mu suppression to egocentric, but not allocentric hand movements

Transcranial alternating current stimulation to the inferior parietal lobe decreases mu suppression to egocentric, but not allocentric hand movements

Object-load and feature-load modulate EEG in a short-term memory task

α-Oscillations in the monkey sensorimotor network influence discrimination performance by rhythmical inhibition of neuronal spiking

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