scholarly journals "The ipsilesional attention bias in right-hemisphere stroke patients as revealed by a realistic visual search task: Neuroanatomical correlates and functional relevance": Correction to Machner et al. (2018).

2019 ◽  
Vol 33 (4) ◽  
pp. 595-595
Author(s):  
Björn Machner ◽  
Inga Könemund ◽  
Janina von der Gablentz ◽  
Paul M. Bays ◽  
Andreas Sprenger
Keyword(s):  
Visual Search ◽  
Search Task ◽  
Right Hemisphere ◽  
Visual Search Task ◽  
Attention Bias ◽  
Stroke Patients ◽  
Functional Relevance ◽  
Right Hemisphere Stroke

Not Just Language: Persisting Lateralized Visuospatial Impairment after Left Hemisphere Stroke

2016 ◽  
Vol 22 (7) ◽  
pp. 695-704 ◽  
Author(s):  
Krista Schendel ◽  
Nina F. Dronkers ◽  
And U. Turken
Keyword(s):  
Visual Search ◽  
Visual Attention ◽  
Left Hemisphere ◽  
Search Task ◽  
Right Hemisphere ◽  
Visual Search Task ◽  
Viewing Time ◽  
Stroke Group ◽  
The Right ◽  
Left Hemisphere Stroke

AbstractObjectives: Imbalances in spatial attention are most often associated with right hemisphere brain injury. This report assessed 25 chronic left hemisphere stroke patients for attentional bias. Methods: Participants were evaluated with a computerized visual search task and a standardized neuropsychological assessment known as the Behavioral Inattention Test (BITC). Twenty age-matched controls were also tested. Results: Although little to no attentional impairment was observed on the BITC, the computerized visual search task revealed statistically significant contralesional attentional impairment in the left hemisphere stroke group. Specifically, these participants required 208 ms more viewing time, on average, to reliably detect visual targets on the right side of the display compared to detection on the left side, while controls showed a difference of only 8 ms between the two sides. Conclusions: The observation of significant leftward visuospatial bias in this chronic stroke group provides further evidence that the left hemisphere also plays a role in the balance of visual attention across space. These results have implications for left hemisphere patients who are often not screened for visuospatial problems, as well as for theories of visual attention which have primarily emphasized the role of the right hemisphere. (JINS, 2016, 22, 695–704)

Effects of visual search task on attentional bias and stress response under pressure

Work ◽  
2021 ◽  
pp. 1-11
Author(s):  
Yonghui Jin ◽  
Jun He
Keyword(s):  
Visual Search ◽  
Stress Response ◽  
Search Task ◽  
Visual Search Task ◽  
Low Frequency ◽  
Attention Bias ◽  
The Self ◽  
Control Group ◽  
Before And After ◽  
Experimental Group

BACKGROUND: it has always been a problem for athletes that their performance is out of order due to pressure in major competitions. The change of attention pattern and the emergence of stress response (SR) caused by negative affect (NA)are the direct reasons for the greater impact on the performance of athletes. It is a hot topic to explore how to improve attention bias (AB) and SR of athletes in stressful situations. OBJECTIVE: the study aimed to analyze the improvement effect of visual search task (VST) training on AB and SR of athletes under pressure situations. METHODS: 62 male basketball players with national level 2 or above of Shenyang sports institute were divided into experimental group (EG) and control group (CG). Visual search task training program was used in the EG (happy, sad, disgusted, neutral faces) and sham training program was used in the CG (all faces with neutral expression) for two months. Under the stress situation, attention behavior of all subjects before and after training was tested. Physiological coherence and autonomic balance system were used to record heart rate variability synchronously. Parallel frequency domain analysis was divided into very low frequency band (VLF), low frequency (LF), high frequency (HF) and total spectrum (TP). The normalized treatment obtained indexes such as HFnorm, LFnorm, and LF/HF. The e-prime 2.0 software was adopted to obtain the attention bias score. The Positive and Negative Affect Scale (PANAS) and the self - rating stress scale were adopted for evaluation before and after training. RESULTS: the self-rating pressure in the two groups was lower than that before the training, and the pressure in the experimental group was lower than that in the control group (P <  0.05). After training, the positive emotion of the experimental group was higher than that of the control group, and the EG was lower than that of the CG (P <  0.05). After training, the score of attention bias of happy and neutral faces in the EG was higher than that of theCG, while the score of attention bias of sad and disgusted faces was lower than that of the CG (P <  0.05). After training, LF/HF and LFnorm in the EG were lower than those in the CG, and HFnorm was higher than those in the CG (P <  0.05). CONCLUSIONS: the training of visual search task can effectively improve the athletes’ PA and AB of positive information, reduce the attention bias of negative information and psychological pressure, and relieve theSR.

scholarly journals Head Position of Patients with Right Hemisphere Damage during a Visual Search Task in a Large Field

2018 ◽  
Vol 08 (02) ◽  
pp. 190-202
Author(s):  
Ken Nakatani ◽  
Shusuke Takahashi ◽  
Daisuke Kimura ◽  
Masako Notoya ◽  
Nobuyuki Sunahara ◽  
...  
Keyword(s):  
Visual Search ◽  
Search Task ◽  
Right Hemisphere ◽  
Visual Search Task ◽  
Head Position ◽  
Large Field ◽  
Right Hemisphere Damage

scholarly journals Brain Activations During Optokinetic Stimulation in Acute Right-Hemisphere Stroke Patients and Hemispatial Neglect: An fMRI Study

2019 ◽  
Vol 33 (7) ◽  
pp. 581-592
Author(s):  
Janina von der Gablentz ◽  
Inga Könemund ◽  
Andreas Sprenger ◽  
Wolfgang Heide ◽  
Marcus Heldmann ◽  
...  
Keyword(s):  
Visual Cortex ◽  
Spatial Attention ◽  
Right Hemisphere ◽  
Attention Bias ◽  
Oculomotor Control ◽  
Optokinetic Stimulation ◽  
Hemispatial Neglect ◽  
Neural Basis ◽  
Stroke Patients ◽  
Right Hemisphere Stroke

Objective. Leftward optokinetic stimulation (OKS) is a promising therapeutic approach for right-hemisphere stroke patients with left hemispatial neglect. We questioned whether the putative neural basis is an activation of frontoparietal brain regions involved in the control of eye movements and spatial attention. Methods. We used functional magnetic resonance imaging to investigate brain activations during OKS in acute right-hemisphere stroke patients (RHS, n = 19) compared with healthy control subjects (HC, n = 9). Based on neuropsychological testing we determined the ipsilesional attention bias in all RHS patients, 11 showed manifest hemispatial neglect. Results. In HC subjects, OKS in either direction led to bilateral activation of the visual cortex (V1-V4), frontal (FEF) and supplementary (SEF) eye fields, intraparietal sulcus (IPS), basal ganglia, and thalamus. RHS patients’ activations were generally reduced compared with HC. Nevertheless, leftward OKS bilaterally activated the visual cortex (V1-V4), FEF, SEF, IPS, and thalamus. The neural response to OKS was negatively correlated with patients’ behavioral impairment: The greater the individual attention bias/neglect the weaker the brain activations. Conclusion. In RHS patients, leftward OKS activates frontoparietal regions (FEF, IPS) that are spared from structural brain damage and functionally involved in both oculomotor control and spatial attention. This may provide a neural basis for the known therapeutic effects of OKS on hemispatial neglect. In acute stroke stages, reduced activation levels correlating with neglect severity indicate functional downregulation of the underlying dorsal attention network. Therefore, chronic RHS patients with less severe neglect after recovery of network disturbances may be more suitable candidates for OKS rehabilitation.

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