scholarly journals Gating of Human Theta Oscillations by a Working Memory Task

2001 ◽  
Vol 21 (9) ◽  
pp. 3175-3183 ◽  
Author(s):  
Sridhar Raghavachari ◽  
Michael J. Kahana ◽  
Daniel S. Rizzuto ◽  
Jeremy B. Caplan ◽  
Matthew P. Kirschen ◽  
...  
Keyword(s):  
Working Memory ◽  
Memory Task ◽  
Theta Oscillations

Concurrent working memory task decreases the Stroop interference effect as indexed by the decreased theta oscillations

Neuroscience ◽  
2014 ◽  
Vol 262 ◽  
pp. 92-106 ◽  
Author(s):  
Y. Zhao ◽  
D. Tang ◽  
L. Hu ◽  
L. Zhang ◽  
G. Hitchman ◽  
...  
Keyword(s):  
Working Memory ◽  
Interference Effect ◽  
Memory Task ◽  
Stroop Interference ◽  
Theta Oscillations

scholarly journals Theta Oscillations in Human Cortex During a Working-Memory Task: Evidence for Local Generators

2006 ◽  
Vol 95 (3) ◽  
pp. 1630-1638 ◽  
Author(s):  
S. Raghavachari ◽  
J. E. Lisman ◽  
M. Tully ◽  
J. R. Madsen ◽  
E. B. Bromfield ◽  
...  
Keyword(s):  
Working Memory ◽  
Sensory Processing ◽  
Memory Function ◽  
Memory Task ◽  
Large Data ◽  
Theta Oscillations ◽  
Resolution Method ◽  
Data Set ◽  
Human Cortex ◽  
Coordinate Regulation

Cortical theta appears important in sensory processing and memory. Intracanial electrode recordings provide a high spatial resolution method for studying such oscillations during cognitive tasks. Recent work revealed sites at which oscillations in the theta range (4–12 Hz) could be gated by a working-memory task: theta power was increased at task onset and continued until task offset. Using a large data set that has now been collected (10 participants/619 recording sites), we have sufficient sampling to determine how these gated sites are distributed in the cortex and how they are synchronized. A substantial fraction of sites in occipital/parietal (45/157) and temporal (23/280) cortices were gated by the task. Surprisingly, this aspect of working-memory function was virtually absent in frontal cortex (2/182). Coherence measures were used to analyze the synchronization of oscillations. We suspected that because of their coordinate regulation by the working-memory task, gated sites would have synchronized theta oscillations. We found that, whereas nearby gated sites (<20 mm) were often but not always coherent, distant gated sites were almost never coherent. Our results imply that there are local mechanisms for the generation of cortical theta.

scholarly journals Theta Oscillations and Source Connectivity During Complex Audiovisual Object Encoding in Working Memory

2021 ◽  
Vol 15 ◽  
Author(s):  
Yuanjun Xie ◽  
Yanyan Li ◽  
Haidan Duan ◽  
Xiliang Xu ◽  
Wenmo Zhang ◽  
...  
Keyword(s):  
Working Memory ◽  
Brain Connectivity ◽  
Memory Task ◽  
Theta Oscillations ◽  
Neural Oscillations ◽  
Neural Signals ◽  
Sensory Modalities ◽  
Cortical Regions ◽  
Oscillation Characteristics ◽  
Single Modality

Working memory is a limited capacity memory system that involves the short-term storage and processing of information. Neuroscientific studies of working memory have mostly focused on the essential roles of neural oscillations during item encoding from single sensory modalities (e.g., visual and auditory). However, the characteristics of neural oscillations during multisensory encoding in working memory are rarely studied. Our study investigated the oscillation characteristics of neural signals in scalp electrodes and mapped functional brain connectivity while participants encoded complex audiovisual objects in a working memory task. Experimental results showed that theta oscillations (4–8 Hz) were prominent and topographically distributed across multiple cortical regions, including prefrontal (e.g., superior frontal gyrus), parietal (e.g., precuneus), temporal (e.g., inferior temporal gyrus), and occipital (e.g., cuneus) cortices. Furthermore, neural connectivity at the theta oscillation frequency was significant in these cortical regions during audiovisual object encoding compared with single modality object encoding. These results suggest that local oscillations and interregional connectivity via theta activity play an important role during audiovisual object encoding and may contribute to the formation of working memory traces from multisensory items.

12. Human hippocampal theta oscillations show performance-dependent phase-locking during a working memory task

2011 ◽  
Vol 122 (1) ◽  
pp. e5
Author(s):  
Jonathan Kleen ◽  
Barbara Jobst ◽  
Kandan Kulandaivel ◽  
Terrance Darcey ◽  
Gregory Holmes ◽  
...  
Keyword(s):  
Working Memory ◽  
Phase Locking ◽  
Memory Task ◽  
Theta Oscillations ◽  
Hippocampal Theta

Articulatory Suppression Increases Proactive and Semantic Interference in a Working Memory Task

2008 ◽  
Author(s):  
Alexandra S. Atkins ◽  
Marc G. Berman ◽  
John Jonides ◽  
Patricia A. Reuterlorenz
Keyword(s):  
Working Memory ◽  
Articulatory Suppression ◽  
Memory Task ◽  
Semantic Interference

Increased neuronal activation and cognitive performance by detemir as compared to human insulin upon a working memory task – an fMRI study

2011 ◽  
Vol 44 (06) ◽  
Author(s):  
B Willenborg ◽  
M Nagel ◽  
K Jauch-Chara ◽  
C Erdmann ◽  
H Lehnert ◽  
...  
Keyword(s):  
Working Memory ◽  
Cognitive Performance ◽  
Human Insulin ◽  
Memory Task ◽  
Neuronal Activation ◽  
Fmri Study
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