scholarly journals Reduced effective connectivity between right parietal and inferior frontal cortex during audiospatial perception in neglect patients with a right-hemisphere lesion

2021 ◽  
Vol 399 ◽  
pp. 108052
Author(s):  
Martin J. Dietz ◽  
Jørgen F. Nielsen ◽  
Andreas Roepstorff ◽  
Marta I. Garrido
Keyword(s):  
Frontal Cortex ◽  
Right Hemisphere ◽  
Effective Connectivity ◽  
Hemisphere Lesion ◽  
Inferior Frontal Cortex

scholarly journals The Neural Locus of Temporal Structure and Expectancies in Music: Evidence From Functional Neuroimaging At 3 Tesla

2005 ◽  
Vol 22 (3) ◽  
pp. 563-575 ◽  
Author(s):  
Daniel J. Levitin ◽  
Vinod Menon
Keyword(s):  
Frontal Cortex ◽  
Classical Music ◽  
Right Hemisphere ◽  
Functional Neuroimaging ◽  
Temporal Structure ◽  
Musical Structure ◽  
Inferior Frontal Cortex ◽  
Signed Language ◽  
Brain Responses ◽  
The Right

The neuroanatomical correlates of temporal structure and expectancies in music were investigated using a unique stimulus manipulation involving scrambled music. The experiment compared brain responses (using functional magnetic resonance imaging) while participants listened to classical music and scrambled versions of that same music. The scrambled versions disrupted musical structure while holding low-level musical attributes constant, including such psychoacoustic parameters as pitch, loudness, and timbre. Comparing music to its scrambled counterpart, we found focal activation in the pars orbitalis region (Brodmann Area 47) of the left inferior frontal cortex, a region that has been previously closely associated with the processing of linguistic structure in spoken and signed language, and additional activation in the right hemisphere homologue of that area. We speculate that this particular region of inferior frontal cortex may be more generally responsible for processing fine-structured stimuli that evolve over time, not merely those that are linguistic.

scholarly journals Dysconnection of right parietal and frontal cortex in neglect syndrome

2017 ◽  
Author(s):  
Martin J. Dietz ◽  
Jørgen F. Nielsen ◽  
Andreas Roepstorff ◽  
Marta I. Garrido
Keyword(s):  
Frontal Cortex ◽  
Brain Region ◽  
Right Hemisphere ◽  
Effective Connectivity ◽  
Healthy Controls ◽  
Distributed Network ◽  
Local Connectivity ◽  
Cortical Regions ◽  
The Right ◽  
The Brain

ABSTRACTA lesion to the right hemisphere of the brain often leads to perceptual neglect of the left side of the sensorium. The fact that lesions to different cortical regions lead to the same symptoms points to neglect as a dysconnection syndrome that may result from the dysconnection of a distributed network, rather than a disruption of computation in any particular brain region. To test this hypothesis, we used Bayesian analysis of effective connectivity based on electroencephalographic recordings in patients with left-sided neglect after a right-hemisphere lesion. While age-matched healthy controls showed a contralateral increase in connection strength between parietal and frontal cortex with respect to the laterality of the stimuli, neglect patients showed a dysconnection between parietal and frontal cortex in the right hemisphere when stimuli appeared on their neglected side, but preserved connectivity in the left hemisphere when stimuli appeared on their right. Crucially, this parieto-frontal feedback connectivity was aggravated in patients with more severe symptoms. In contrast, patients and controls did not show differences in the local connectivity within regions. These findings suggest that the aetiology of neglect may lie in the dysconnection of a distributed network, rather than the disruption of any particular brain region.

An active role of inferior frontal cortex in conscious experience

2021 ◽  
Author(s):  
Veith Weilnhammer ◽  
Merve Fritsch ◽  
Meera Chikermane ◽  
Anna-Lena Eckert ◽  
Katharina Kanthak ◽  
...  
Keyword(s):  
Frontal Cortex ◽  
Conscious Experience ◽  
Active Role ◽  
Inferior Frontal Cortex

scholarly journals Decreased event-related theta power and phase-synchrony in young binge drinkers during target detection: An anatomically-constrained MEG approach

2018 ◽  
Vol 33 (3) ◽  
pp. 335-346 ◽  
Author(s):  
A Correas ◽  
E López-Caneda ◽  
L Beaton ◽  
S Rodríguez Holguín ◽  
LM García-Moreno ◽  
...  
Keyword(s):  
Alcohol Consumption ◽  
Frontal Cortex ◽  
Binge Drinking ◽  
Target Detection ◽  
Attentional Control ◽  
Theta Power ◽  
Inferior Frontal Cortex ◽  
Binge Drinkers ◽  
The Right ◽  
Integrative Processing

Background: The prevalence of binge drinking has risen in recent years. It is associated with a range of neurocognitive deficits among adolescents and young emerging adults who are especially vulnerable to alcohol use. Attention is an essential dimension of executive functioning and attentional disturbances may be associated with hazardous drinking. The aim of the study was to examine the oscillatory neural dynamics of attentional control during visual target detection in emerging young adults as a function of binge drinking. Method: In total, 51 first-year university students (18 ± 0.6 years) were assigned to light drinking ( n = 26), and binge drinking ( n = 25) groups based on their alcohol consumption patterns. A high-density magnetoencephalography signal was combined with structural magnetic resonance imaging in an anatomically constrained magnetoencephalography model to estimate event-related source power in a theta (4–7 Hz) frequency band. Phase-locked co-oscillations were further estimated between the principally activated regions during task performance. Results: Overall, the greatest event-related theta power was elicited by targets in the right inferior frontal cortex and it correlated with performance accuracy and selective attention scores. Binge drinkers exhibited lower theta power and dysregulated oscillatory synchrony to targets in the right inferior frontal cortex, which correlated with higher levels of alcohol consumption. Conclusions: These results confirm that a highly interactive network in the right inferior frontal cortex subserves attentional control, revealing the importance of theta oscillations and neural synchrony for attentional capture and contextual maintenance. Attenuation of theta power and synchronous interactions in binge drinkers may indicate early stages of suboptimal integrative processing in young, highly functioning binge drinkers.

scholarly journals An exploration of face selectivity in human inferior frontal cortex

2010 ◽  
Vol 6 (6) ◽  
pp. 663-663 ◽  
Author(s):  
A. W.-Y. Chan ◽  
M. V. Peelen ◽  
P. E. Downing
Keyword(s):  
Frontal Cortex ◽  
Inferior Frontal Cortex ◽  
Face Selectivity

scholarly journals Dysprosody Remaining in a Non-Right-Handed Patient with Apraxia of Speech due to Right Hemisphere Lesion

2020 ◽  
Vol 61 (1) ◽  
pp. 67-75
Author(s):  
Shinya Fukunaga ◽  
Haruki Tokida ◽  
Masashi Shiomi ◽  
Masahiro Ikeno ◽  
Shinsuke Nagami ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Apraxia Of Speech ◽  
Hemisphere Lesion
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