11/7/2023 0 Comments Occipital contour definitionIn contrast, beta-coherence in a prefrontal-occipital functional connection and gamma-coherence in an inferior frontal-occipitoparietal connection was not affected by the addition of the second task and only showed elevated coherence under high working memory load. Beta-coherence increased within two dorsofrontal-occipital connections in dual-task conditions compared to the single-task condition, with the highest coherence seen during low working memory load trials. Three connections in the beta-band (18-24 Hz) and one in the gamma-band (30-40 Hz) were modulated by dual-task performance. Electroencephalography data was analysed using a novel data-driven approach assessing source coherence at the whole-brain level. Project description:This study investigated the spatial, spectral, temporal and functional proprieties of functional brain connections involved in the concurrent execution of unrelated visual perception and working memory tasks. In contrast, the long-range connectivity in the gamma frequency range along the fronto-parieto-occipital axis might be related to the endogenous binding and subjective clarity of facial visual features. We speculate that the local frontal synchrony in the theta frequency range might be associated with an effortful top-down mnemonic reactivation of faces. Furthermore, we found that visual imagery of faces is associated with an increase of short-range frontal synchronisation in the theta frequency range, which temporally preceded the long-range increase in the gamma synchronisation. Gamma range synchronisation between occipitoparietal electrode pairs predicted subjective ratings of the contour definition of imagined faces. In contrast, no effect of imagery was observed in the connectivity between occipitotemporal electrode pairs. We found that voluntary visual imagery of faces is associated with long-range phase synchronisation in the gamma frequency range between frontoparietal electrode pairs and between occipitoparietal electrode pairs. Here we used electroencephalography to investigate neural connectivity and its dynamics between frontal, parietal, occipital and temporal electrodes during visual imagery of faces. However, the neural connectivity between these regions during visual imagery of socially relevant stimuli has not been studied. Many studies using imaging and neurophysiological techniques have shown several similarities in brain activity between visual imagery and visual perception, and have identified frontoparietal, occipital and temporal neural components of visual imagery. In the social domain, we imagine other individuals while recalling our encounters with them or modelling alternative social interactions in future. Send us feedback about these examples.ABSTRACT: Mental imagery is the process through which we retrieve and recombine information from our memory to elicit the subjective impression of "seeing with the mind's eye". These examples are programmatically compiled from various online sources to illustrate current usage of the word 'occipital.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. 2015 Specifically, brain activity began in temporal regions instead of frontal, and there was no activity in occipital (visual) cortex or parietal areas. Neuroskeptic, Discover Magazine, 9 June 2012 The vertical occipital fasciculus (VOF) debuted in an atlas by German psychiatrist and anatomist Carl Wernicke in 1881. 2023 Lobe labels were blue ( occipital, temporal, parietal, and frontal). Matthew Gavin Frank, Harper's Magazine, 2 June 2023 One of the big ones is understanding how the brain translates visual information into mental images as processed by our occipital and temporal lobes. Peter Aitken, Fox News, 13 July 2023 Two dying patients, on being removed from ventilator support, exhibited surges of gamma-wave activity within the temporo–parieto– occipital junctions, as well as between the TPO zones and the contralateral prefrontal areas. Michael Lee Simpson, Peoplemag, 14 July 2023 Suleiman Hassan, a 12-year-old Palestinian from the West Bank, suffered what is known as an internal decapitation, with his skull detached from the top vertebrae of his spine - officially known as a bilateral atlanto occipital joint dislocation, according to The Times of Israel. Young, Scientific American, 18 July 2023 The condition, bilateral atlanto occipital joint dislocation, is commonly known as internal or orthopedic decapitation. Recent Examples on the Web Scurry later found out that the blow resulted in a traumatic brain injury that smashed her occipital nerve.
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