scholarly journals Dynamic signatures of the Eureka effect: An EEG study

2021 ◽  
Author(s):  
Yiqing Lu ◽  
Wolf Singer
Keyword(s):  
Prior Knowledge ◽  
Creative Thinking ◽  
Right Hemisphere ◽  
Fractal Dimensionality ◽  
Neural Dynamics ◽  
Perceptual Task ◽  
Alpha Power ◽  
Beta Band ◽  
Manual Responses ◽  
The Right

AbstractThe Eureka effect refers to the common experience of suddenly solving a problem. Here we study this effect in a pattern recognition paradigm that requires the segmentation of complex scenes and recognition of objects on the basis of Gestalt rules and prior knowledge. In the experiments both sensory evidence and prior knowledge were manipulated in order to obtain trials that do or do not converge towards a perceptual solution. Subjects had to detect objects in blurred scenes and signal recognition with manual responses. Neural dynamics were analyzed with high-density Electroencephalography (EEG) recordings. The results show significant changes of neural dynamics with respect to spectral distribution, coherence, phase locking, and fractal dimensionality. The Eureka effect was associated with increased coherence of oscillations in the alpha and theta band over widely distributed regions of the cortical mantle predominantly in the right hemisphere. This increase in coherence was associated with a decrease of beta band activity over parietal and central regions, and with a decrease of alpha power over frontal and occipital areas. In addition, there was a lateralized reduction of fractal dimensionality for activity recorded from the right hemisphere. These results suggest that the transition towards the solution of a perceptual task is mainly associated with a change of network dynamics in the right hemisphere that is characterized by enhanced coherence and reduced complexity. We propose that the Eureka effect requires cooperation of cortical regions involved in working memory, creative thinking, and the control of attention.

THE CREATIVE INVESTIGATION OF BRAIN ACTIVITY WITH EEG FOR GENDER AND LEFT/RIGHT-HANDED DIFFERENCES

2015 ◽  
Vol 15 (04) ◽  
pp. 1550054 ◽  
Author(s):  
YAN XIONG ◽  
YAN LI ◽  
YU CHEN ◽  
PING YUAN ◽  
YUBO FAN ◽  
...  
Keyword(s):  
Left Hemisphere ◽  
Creative Thinking ◽  
Right Hemisphere ◽  
Brain Activity ◽  
Idea Generation ◽  
Alpha Power ◽  
Parietal Region ◽  
Left Handed ◽  
Original Group ◽  
The Right

This paper studied the differences of gender and left/right-handed groups from a neuroscience perspective through task-related power of alpha power changes during the generation of creative ideas. Aiming to investigate the effects of the differences, it will help understand the specific neural processes for different genders and left/right-handed groups. We used B-Alert X10®; electroencephalography (EEG) system, computed for left and right hemispheres, to determine if EEG metrics differentiated between the gender and left/right-handed groups. This study assessed EEG power spectral density (PSD) while 17 healthy participants worked on the alternative uses (AU) task. The results showed that (1) the creativity level has no relations with the gender; there is no obvious difference between males and females on the process of creative idea generation. (2) The creativity level is high related to the cultivation of innovative ability. There is obvious higher alpha power changes in posterior regions of the right hemisphere compared to the left hemisphere of the brain for high original group, and a stronger task-related alpha synchronization showed in the right hemisphere than that in the left one for the low original group. (3) There is comparatively lower alpha power in parietal region in the left hemisphere than that in the right one for the left-handed participants, and higher alpha power in the frontal region for the left-handed and in parietal region for right-handed participants. The comparison among different genders and left/right-handed participants can help us understand more about the creative thinking manifested in the human brain.

Aesthetic Preference and Lateral Dominance

1988 ◽  
Vol 67 (2) ◽  
pp. 555-561 ◽  
Author(s):  
Mary Ann Valentino ◽  
James W. Brown ◽  
W. A. Cronan-Hillix
Keyword(s):  
Right Hemisphere ◽  
Response Mode ◽  
Psychology Student ◽  
Manual Response ◽  
Verbal Responses ◽  
Left Handed ◽  
Manual Responses ◽  
Student Subjects ◽  
The Right ◽  
Aesthetic Preferences

Aesthetic preferences for photographs with the main focal content either to the left or right of the photograph's center were examined in right- and left-handed subjects. Verbal responses or manual responses were required. In one experiment with 261 introductory psychology student-subjects, left-handers more often preferred photographs with the more important part on the left (“left-geared”) than did right-handers. Exp. 2, involving 84 right-handed student subjects, showed that left-geared photographs presented on the left side were preferred more often than left-geared photographs presented on the right side, and left-geared photographs presented on the left side were more often chosen when a left-handed manual response was required. Interactions between handedness, position of the stimulus, language hemisphere, and response mode make it extremely difficult to ascertain whether the right hemisphere is really more involved in aesthetic decisions.

scholarly journals Appetitive and aversive motivation in depression: The temporal dynamics of task-elicited asymmetries in alpha oscillations

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Simone Messerotti Benvenuti ◽  
Giulia Buodo ◽  
Rocco Mennella ◽  
Elisa Dal Bò ◽  
Daniela Palomba
Keyword(s):  
Right Hemisphere ◽  
Temporal Dynamics ◽  
Alpha Power ◽  
Specific Measure ◽  
Time Frequency ◽  
Passive Viewing ◽  
The Difference ◽  
Emotional Pictures ◽  
The Right ◽  
Aversive Motivation

AbstractThe capability model of alpha asymmetries posits that state emotional manipulations are a more powerful detector of depression-related motivational deficits than alpha activity at rest. The present study used a time-frequency approach to investigate the temporal dynamics of event-related changes in alpha power during passive viewing of emotional pictures in individuals with dysphoria (n = 23) and in individuals without dysphoria (n = 24). In the whole group, the processing of pleasant and unpleasant compared to neutral pictures was associated with a decrease in event-related alpha power (i.e., alpha desynchronization) at centro-parietal and parietal scalp sites in the 538–1400 ms post-stimulus. The group with dysphoria revealed a smaller alpha desynchronization than the group without dysphoria in response to pleasant, but not neutral and unpleasant, stimuli at frontal, fronto-central and centro-parietal sites. Interestingly, at central and centro-parietal scalp sites, the difference between groups in response to pleasant stimuli was lateralized to the right hemisphere, whereas no clear lateralization was observed at frontal and fronto-central scalp sites. These findings suggest that decreased cortical activity (i.e., reduced alpha desynchronization) in a network involving bilateral frontal and right-lateralized parietal regions may provide a specific measure of deficits in approach-related motivation in depression.

scholarly journals Biophysics Of Brain Activity. Brain Activity In The Development Of "Creative Thinking" "Mind Map"

2021 ◽  
Vol 12 (4) ◽  
pp. 1-6
Author(s):  
A. G. Ganiev, Z. Sh. Abdunazarova
Keyword(s):  
Energy Consumption ◽  
Creative Thinking ◽  
Right Hemisphere ◽  
Brain Activity ◽  
Cerebral Hemispheres ◽  
Folk Tales ◽  
Visual Mechanism ◽  
The Right ◽  
The Mind ◽  
The Brain

The article provides information about the human brain, including its energy consumption, the functional functions of its parts, the biophysics of the sensory channels of the visual mechanism. The channels of movement of information through the neural fibers of the brain, the description of "unusual" ideas that lead to new and "creative thinking", the importance of the method of "comparative learning" in the development of "imagination" and "creative thinking" were discussed. The “specialty-related” mind map of the cerebral hemispheres serves to visualize and develop the activity of the right hemisphere of the brain, which is responsible for “creative thinking”. To activate the right hemisphere of the brain, it is recommended to use emotional "mind map", Uzbek folk tales, folk sports, folklore. The "mind map" of the sensory channels encourages feedback on the functioning of the human sensory organs, the mechanism of information reception, and opportunities to increase the efficiency of this process. It serves to visualize the mechanism by which ‘imagination’ is formed.

scholarly journals Individual alpha power predicts language comprehension

2021 ◽  
Author(s):  
Peng Wang ◽  
Yifei He ◽  
Burkhard Maess ◽  
Jinxing Yue ◽  
Luyao Chen ◽  
...  
Keyword(s):  
Language Processing ◽  
Language Comprehension ◽  
Right Hemisphere ◽  
Cognitive Task ◽  
Individual Performance ◽  
Brain Regions ◽  
Oscillatory Activity ◽  
Alpha Power ◽  
The Individual ◽  
The Right

Alpha power attenuation during cognitive task performing has been suggested to reflect a process of release of inhibition, increase of excitability, and thereby benefit the improvement of performance. Here, we hypothesized that changes in individual alpha power during the execution of a complex language comprehension task may correlate with the individual performance in that task. We tested this using magnetoencephalography (MEG) recorded during comprehension of German sentences of different syntactic complexity. Results showed that neither the frequency nor the power of the spontaneous oscillatory activity at rest were associated with the individual performance. However, during the execution of a sentences processing task, the individual alpha power attenuation did correlate with individual language comprehension performance. Source reconstruction localized effects in temporal-parietal regions of both hemispheres. While the effect of increased task difficulty is localized in the right hemisphere, the difference in power attenuation between tasks of different complexity exhibiting a correlation with performance was localized in left temporal-parietal brain regions known to be associated with language processing. From our results, we conclude that in-task attenuation of individual alpha power is related to the essential mechanisms of the underlying cognitive processes, rather than merely to general phenomena like attention or vigilance.

FEATURE EXTRACTION OF ELECTROENCEPHALOGRAM SIGNAL GENERATED FROM WRITING IN DYSLEXIC CHILDREN USING DAUBECHIES WAVELET TRANSFORM

2016 ◽  
Vol 78 (6-8) ◽  
Author(s):  
Zulkifli Mahmoodin ◽  
Wahidah Mansor ◽  
Lee Yoot Khuan ◽  
Noor Bariah Mohamad ◽  
Sariah Amirin
Keyword(s):  
Feature Extraction ◽  
Wavelet Transform ◽  
Right Hemisphere ◽  
Electrode Placement ◽  
Daubechies Wavelet ◽  
Eeg Signal ◽  
Beta Band ◽  
Reading And Writing ◽  
The Right ◽  
The Brain

Dyslexia which causes learning deficiencies in reading and writing is due to a neurological disorder where the brain processes information differently. This paper describes the feature extraction of (EEG) signal using Daubechies wavelet transform. The EEG signals were recorded from capable and poor dyslexic children during writing activities of non-words. Brain learning pathway theories for reading and writing were used to localize electrode placement to 8 positions, namely C3, C4, P3, P4, T7, T8, FC5 and FC6. Daubechies provide the wavelet function shape that represent the type of features in an EEG signal well, detecting variations in frequencies that corresponds to activation of areas in relation to activities. Results showed that capable dyslexic subjects exhibit higher beta band power feature of the frontal (FC6) and parietal (P4) right hemisphere if compared to poor dyslexics, where the normal left hemisphere processing center was utilized. This indicates that the brain of dyslexic is compensating its deficiencies of the left brain with activation of areas to the right.  

scholarly journals Hemispheric antagonism in visuo-spatial neglect: A case study

1996 ◽  
Vol 2 (5) ◽  
pp. 412-418 ◽  
Author(s):  
John C. Marshall ◽  
Peter W. Halligan
Keyword(s):  
Right Hemisphere ◽  
Task Demands ◽  
Line Bisection ◽  
Spatial Neglect ◽  
Perceptual Task ◽  
Left Hand ◽  
Right Hand ◽  
The Right ◽  
Line Bisection Task

AbstractWe report a case of severe visuo-spatial neglect consequent upon right-hemisphere stroke. At the time of testing, the patient had no visual field cut and no significant hemiparesis. Conventional testing on cancellation tasks with the right hand revealed reliable left neglect, but performance was significantly improved when the left hand was used. Investigations of (manual) line bisection showed normal performance with the right hand but right neglect when the left hand was used. Right neglect was also observed on a purely perceptual version of the line bisection task. We argue that the attentional vectors of the cerebral hemispheres can be modulated by (perceptual) task-demands and by (motorie) response demands. (JINS, 1996, 2, 412–418.)

Prosopagnosia as a Deficit in Encoding Curved Surface

2001 ◽  
Vol 13 (5) ◽  
pp. 556-576 ◽  
Author(s):  
Bruno Laeng ◽  
Verne S. Caviness
Keyword(s):  
Smooth Surface ◽  
Right Hemisphere ◽  
Curved Surface ◽  
Perceptual Task ◽  
Semantic Categorization ◽  
Surface Information ◽  
Perceptual Judgments ◽  
Normal Limits ◽  
The Right ◽  
Human Faces

RP is a case of “developmental” prosopagnosia who, according to brain-imaging segmentation data, shows a reduction in volume of a limited set of structures of the right hemisphere. RP is as accurate as control subjects in tasks requiring the perception of nonface objects (e.g., matching subordinate labels to exemplars, naming two-tone images), with the exception of one perceptual task: The matching of different perspectives of amoebae-like stimuli (i.e., volumes made of a single smooth surface). In terms of speed (“efficiency”) of responses, RP's performance falls clearly outside the normal limits also in other tasks that include “natural” but nonface stimuli (i.e., animals, artifacts). Specifically, RP is slow in perceptual judgments made at very low (subordinate) levels of semantic categorization and for objects and artifacts whose geometry present much curved features and surface information. We conclude from these analyses that prosopagnosia can be the result of a deficit in the representation of basic geometric volumes made of curved surface. In turn, this points to the importance (necessity) for the normal visual system of such curved and volumetric information in the identification of human faces.

Multiple measures of hemispheric dysfunction in schizophrenia and depression

1983 ◽  
Vol 13 (2) ◽  
pp. 287-297 ◽  
Author(s):  
Sid J. Schneider
Keyword(s):  
Skin Conductance ◽  
Skin Conductance Response ◽  
Right Hemisphere ◽  
Electrodermal Activity ◽  
Skin Conductance Level ◽  
Perceptual Task ◽  
Left Hand ◽  
Chronic Schizophrenics ◽  
The Right ◽  
Conductance Level

SYNOPSISElectrodermal, electroencephalographic and perceptual measures of lateral hemispheric function were obtained from groups of chronic schizophrenics, depressives and normals on 2 occasions, separated by 4 weeks. The measures of hemispheric function were derived from previous research. About half of the schizophrenics were medicated on both occasions; the other schizophrenics underwent drug ‘washout’ before the first session. Results revealed that the measures of laterality were not strongly intercorrelated. In the perceptual task, the schizophrenics and normals displayed different laterality effects. Unlike the normals, the schizophrenics' left hemisphere function appeared to be inferior to the right hemisphere function in the perceptual task. The laterality effects of the depressives and normals differed on two electrodermal measures: skin conductance level and skin conductance response amplitude. The depressives' electrodermal activity from the right hand was diminished as compared with the left hand; the normals did not show this effect. Medication decreased electrodermal activity in the schizophrenics, but had no significant effect on laterality. These results suggest that the various measures of laterality used singly in previous research in psychopathology may not all assess the same phenomenon.

scholarly journals Reduced interhemispheric and increased intrahemispheric connectivity in schizophrenia brain networks

2019 ◽  
Author(s):  
Jorne Laton ◽  
Jeroen Van Schependom ◽  
Jeroen Decoster ◽  
Tim Moons ◽  
Marc De Hert ◽  
...  
Keyword(s):  
Corpus Callosum ◽  
Resting State ◽  
Right Hemisphere ◽  
Brain Connectivity ◽  
Similarity Measures ◽  
Beta Band ◽  
Auditory Oddball ◽  
Eyes Closed ◽  
Eyes Open ◽  
The Right

AbstractIntroductionBrain connectivity is disturbed in schizophrenia, both during resting state and during active tasks. Schizophrenia is characterised by a corpus callosum pathology and an inability to suppress overstimulation, both of which relate to this disturbed connectivity. We wanted to verify whether network analysis on EEG sensor level can reveal the corpus callosum pathology in schizophrenia.MethodsWe measured 62-channel EEG on 46 schizophrenia patients and 43 healthy controls during eyes-closed and eyes-open resting-state, mismatch negativity and visual and auditory oddball. We assessed connectivity through correlation, coherence and directed transfer function (DTF) in the delta, theta, alpha, low- and high beta bands.ResultsThe coherence and the DTF picked up a consistent pattern of reduced interhemispheric and enhanced intrahemispheric connectivity strength in schizophrenia in the alpha and beta band. This disturbance pattern appeared across all paradigms in the parietal and the occipital region and was generally more pronounced in the right hemisphere.ConclusionsThis is the first study to use multiple similarity measures and different tasks to confirm disturbed brain connectivity on EEG sensor level. We hypothesise that the interhemispheric reductions reflect transcallosal disconnection, while the intrahemispheric increases indicate the inability to suppress the response to stimuli.

Sign in / Sign up

Export Citation Format

Share Document