scholarly journals A novel clinical test of recognition reaction time in healthy adults.

2012 ◽  
Vol 24 (1) ◽  
pp. 249-254 ◽  
Author(s):  
James T. Eckner ◽  
James K. Richardson ◽  
Hogene Kim ◽  
David B. Lipps ◽  
James A. Ashton-Miller
Keyword(s):  
Reaction Time ◽  
Healthy Adults ◽  
Clinical Test ◽  
Recognition Reaction Time

scholarly journals The effects of Guarana (Paullinia cupana) supplementation on the cognitive performance of young healthy adults – a Systematic Review

2019 ◽  
Vol 2 (2) ◽  
pp. 171-182
Author(s):  
Fanaras Konstantinos ◽  
Reinhard Heun
Keyword(s):  
Systematic Review ◽  
Clinical Trials ◽  
Reaction Time ◽  
Cognitive Performance ◽  
Amazon Basin ◽  
Data Extraction ◽  
Healthy Adults ◽  
Natural Health Products ◽  
Controlled Clinical Trials ◽  
Paullinia Cupana

AbstractObjectivesGuarana (Paullinia cupana) from the Sapindaceae family, native to the Amazon basin, is a natural stimulant herb that can be found in popular energy drinks, pharmaceutical shops or local herb shops. With the use of natural health products increasing, guarana has gained a fair amount of popularity in the past years. In this systematic review, we examined the effects of guarana supplementation on cognitive performance. A secondary objective was to compare guarana with caffeine on cognitive performance.MethodsSearches were made in PubMed using the terms ‘Guarana’ or ‘Paullinia cupana’. Filters focused on Controlled Clinical trials. Inclusion criteria were met by studies using interventions with guarana, while focusing on guarana’s effects on cognition. Participants needed to be young, healthy adults. Studies not published in English or Greek were excluded. The last date of our search was March 7, 2019.ResultsA total of 29 studies were identified and screened. After screening, 17 studies were excluded. The remaining 12 studies were found eligible for data extraction. After reading the full text of the 12 studies, 3 studies were excluded. In the end, 9 studies were found eligible for our systematic review (n = 369 participants). In these studies, guarana showed to improve reaction time and accuracy of performance at cognitive tasks. No significant differences were found when comparing guarana with caffeine.ConclusionGuarana seems to improve reaction time and accuracy of performance at tasks, but no significant effects were found when compared with caffeine. High quality randomized controlled clinical trials with a low risk of bias are needed to further study the herb.

WAVELET ANALYSIS OF LOW BACK SURFACE EMG SIGNALS SUBJECT TO UNEXPECTED LOAD

2004 ◽  
Vol 04 (03) ◽  
pp. 389-400 ◽  
Author(s):  
M. H. POPE ◽  
N. D. PANAGIOTACOPULOS ◽  
W. STIELAU ◽  
K. FRIESEN ◽  
J. S. LEE
Keyword(s):  
Low Back Pain ◽  
Back Pain ◽  
Reaction Time ◽  
Chronic Low Back Pain ◽  
Erector Spinae ◽  
Back Surface ◽  
Initial Reaction ◽  
Clinical Test ◽  
Low Back ◽  
Normal Subject

This study reports a new technique for the analysis of electromyographic signals from the low back muscles. More specifically, the effect of unexpected load on a normal subject and a subject with chronic low back pain was determined and quantified using wavelet based analysis (Morlet wavelet). The analysis was performed using a Wavelet software system, subsequently referred to as PSCW. The system identified automatically, accurately, and in a uniquely reproducible manner the time response of the erector spinae muscle. The exact number of responses as well as their corresponding time and amplitude were determined and tabulated. It was observed that the initial reaction time for the normal subject was faster than the reaction time for the subject chronic low back pain. The importance of this observation may help in the understanding of the physiology of the neuromuscular system associated with low back spine disorders. It is believed that an occupational and clinical test based on this observation that could give an accurate assessment of the status of low back disorder could be designed. Based on this assessment a rehabilitation program could be developed with the objective of improving the condition of a spine disorder (decrease the initial response time) by muscle strengthening.

scholarly journals Practice Effects Associated With Repeated Assessment of a Clinical Test of Reaction Time

2014 ◽  
Vol 49 (3) ◽  
pp. 356-359 ◽  
Author(s):  
Gianluca Del Rossi ◽  
Alfonso Malaguti ◽  
Samanta Del Rossi
Keyword(s):  
Reaction Time ◽  
Sports Medicine ◽  
Reaction Times ◽  
Repeated Administration ◽  
Drop Test ◽  
Practice Effects ◽  
Clinical Test ◽  
Practice Session ◽  
Medicine Research ◽  
Change In Mean

Context: Researchers have confirmed that the ruler-drop test could be included as part of a multifaceted concussion-assessment battery and potentially as a way to track recovery from head injury. However, it is unclear if this clinical test of reaction time would be characterized by inconsistent performance because of practice effects. Objective: To determine if the ruler-drop test is susceptible to practice effects after serial administration. Design: Descriptive laboratory study. Setting: Sports medicine research laboratory. Patients or Other Participants: Forty-three persons (age = 21.8 ± 2.6 years). Intervention(s): Ten sessions were completed over 5 weeks. Participants completed 10 trials of the ruler-drop test during each session. Main Outcome Measure(s): The mean reaction times calculated for all participants from each test session were analyzed to determine if there was any meaningful change (ie, improvement) in reaction time over the course of the investigation. Results: Simple reaction time improved (ie, decreased) after repeated administration of the ruler-drop test, and the most pronounced improvement occurred between the first 2 test sessions. Between the first and second test sessions, reaction time decreased by almost 7 milliseconds, and there was an overall improvement of almost 13 milliseconds between the first and tenth sessions. Although the pairwise comparisons between the first and second and the first and third sessions were not significant, the change in mean reaction time between the first session and most of the other sessions was significant. We noted no differences when successive sessions were compared. Conclusions: To prevent practice-related improvements in reaction time, practitioners should allow at least 1 practice session before recording baseline results on the ruler-drop test.

Left anterior cingulate activity predicts intra-individual reaction time variability in healthy adults

2015 ◽  
Vol 72 ◽  
pp. 22-26 ◽  
Author(s):  
Beth P. Johnson ◽  
Ari Pinar ◽  
Alex Fornito ◽  
L. Sanjay Nandam ◽  
Robert Hester ◽  
...  
Keyword(s):  
Reaction Time ◽  
Healthy Adults ◽  
Anterior Cingulate ◽  
Time Variability ◽  
Reaction Time Variability ◽  
Individual Reaction

50. Recognition of relative pitch and reaction time in healthy adults

2008 ◽  
Vol 119 (6) ◽  
pp. e87
Author(s):  
Koki Yamashita ◽  
Ken Nakazawa ◽  
Ichiro Shimoyama
Keyword(s):  
Reaction Time ◽  
Healthy Adults ◽  
Relative Pitch

Does Post-Exposural Directional Scanning Offer a Sufficient Explanation for Lateral Differences in Tachistoscopic Recognition?

1974 ◽  
Vol 38 (1) ◽  
pp. 43-50 ◽  
Author(s):  
Walter F. McKeever
Keyword(s):  
Reaction Time ◽  
Cerebral Dominance ◽  
Tachistoscopic Recognition ◽  
Recognition Reaction Time

White's recent criticisms of experiments by McKeever and Huling are discussed. The points are made that, contrary to White's claim, McKeever and Huling never attributed all obtainable lateral recognition differences to effects of cerebral dominance and that White's criticisms in no way establish a directional scanning hypothesis as compatible with the results obtained under the conditions of the McKeever and Huling experiments. That the scanning hypothesis also fails to account for many other results obtained in recognition and recognition reaction time studies is indicated.

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