The Experts below are selected from a list of 198 Experts worldwide ranked by ideXlab platform

Hatice Kumru - One of the best experts on this subject based on the ideXlab platform.

  • Paired-Pulse Transcranial Magnetic Stimulation During Preparation for Simple and Choice Reaction Time Tasks
    Journal of Neurophysiology, 2010
    Co-Authors: Oscar Soto, Josep Valls-solé, Hatice Kumru
    Abstract:

    Motor preparation for execution of both simple and Choice Reaction Time tasks (SRT and CRT) involves enhancement of corticospinal excitability (CE). However, motor preparation also implies changes ...

  • excitability of subcortical motor circuits in go nogo and forced Choice Reaction Time tasks
    Neuroscience Letters, 2006
    Co-Authors: Hatice Kumru, Xabier Urra, Yaroslau Compta, Juan M Castellote, Josefa Turbau, Josep Vallssole
    Abstract:

    The size of the response to a startling auditory stimulus (SAS) may reflect the excitability of the reticulospinal tract. In this study, we examined whether there was any excitability change in the reticulospinal tract during preparation for execution of two types of Choice Reaction Time task: a forced Choice Reaction Time task (fCRT) and a Go/no-Go task (GnG). In 13 healthy volunteers we used three types of trials: control trials in which subjects were requested to perform ballistic wrist movements during fCRT or GnG tasks; test trials in which a SAS was presented with the visual cue, and baseline trials in which SAS was presented alone. Latency and area of the responses to SAS were measured in the orbicularis oculi and in the sternocleidomastoid (SCM) muscles. The results obtained in baseline trials were used to calculate the mean resting baseline excitability level of the reticulospinal tract for each individual, and the values obtained in test trials were expressed as percentages of mean baseline for normalization of data from all individuals. The area of the responses to SAS in SCM was significantly larger in fCRT than in GnG (p=0.002). There was a significant shortening of Reaction Time in test trials that was inversely correlated with area of SCM (p<0.05). We conclude that the subcortical motor tracts activated by SAS are more excitable during fCRT tasks than GnG tasks. Changing the excitability of subcortical motor structures may be a strategy used by the central nervous system in motor control that is selected according to the motor program.

Thierry Hasbroucq - One of the best experts on this subject based on the ideXlab platform.

  • physiological evidence for response inhibition in Choice Reaction Time tasks
    Brain and Cognition, 2004
    Co-Authors: Boris Burle, Franck Vidal, Christophe Tandonnet, Thierry Hasbroucq
    Abstract:

    Inhibition is a widely used notion proposed to account for data obtained in Choice Reaction Time (RT) tasks. However, this concept is weakly supported by empirical facts. In this paper, we review a series of experiments using Hoffman reflex, transcranial magnetic stimulation and electroencephalography to study inhibition in Choice RT tasks. We provide empirical support for the idea that inhibition does occur during Choice RT, and the implications of those findings for various classes of Choice RT models are discussed.

  • Serotonin and human information processing: an electromyographic study of the effects of fluvoxamine on Choice Reaction Time.
    Neuroscience Letters, 1999
    Co-Authors: Philippe Rihet, Thierry Hasbroucq, Olivier Blin, Camille-aimé Possamaï
    Abstract:

    Previous studies have shown that fluvoxamine, an inhibitor of serotonin reuptake, shortens Choice Reaction Time. The present study, was intended to explore this effect by using two complementary approaches: (i) Sternberg's additive factor method, and (ii) the analysis of the electromyographic activity of a prime mover. Eight healthy subjects who received either a single oral dose of fluvoxamine (100 mg) or a placebo participated in a Choice Reaction Time experiment in which imperative signal intensity, stimulus-response mapping, and response repertoire were manipulated. Previous results were replicated. Moreover, it was shown that fluvoxamine shortens the interval between prime mover activation and overt response. This supports the hypothesis proposed in a previous study that fluvoxamine affects motor processes. A possible mechanism of this effect is discussed.

Dinesh Thangavel - One of the best experts on this subject based on the ideXlab platform.

  • A comparative study on visual Choice Reaction Time for different colors in females.
    Neurology Research International, 2014
    Co-Authors: Grrishma Balakrishnan, Gurunandan Uppinakudru, Gaur Girwar Singh, Shobith Bangera, Aswini Dutt Raghavendra, Dinesh Thangavel
    Abstract:

    Reaction Time is one of the important methods to study a person's central information processing speed and coordinated peripheral movement response. Visual Choice Reaction Time is a type of Reaction Time and is very important for drivers, pilots, security guards, and so forth. Previous studies were mainly on simple Reaction Time and there are very few studies on visual Choice Reaction Time. The aim of our study was to compare the visual Choice Reaction Time for red, green, and yellow colors of 60 healthy undergraduate female volunteers. After giving adequate practice, visual Choice Reaction Time was recorded for red, green, and yellow colors using Reaction Time machine (RTM 608, Medicaid, Chandigarh). Repeated measures of ANOVA and Bonferroni multiple comparison were used for analysis and P < 0.05 was considered statistically significant. The results showed that both red and green had significantly less Choice visual Choice Reaction (P values

Andre Denjean - One of the best experts on this subject based on the ideXlab platform.

  • a distributional analysis of the effect of physical exercise on a Choice Reaction Time task
    Journal of Sports Sciences, 2006
    Co-Authors: Karen Davranche, Michel Audiffren, Andre Denjean
    Abstract:

    The aim of this study was to examine the facilitating effects of physical exercise on the Reaction process. Eleven participants with specific expertise in decision-making sports performed a Choice Reaction Time task during moderate sub-maximal exercise (90% of their ventilatory threshold power). Participants were tested at rest and while cycling. During exercise, the participants were faster, without being more variable. We suggest that the effect of exercise on cognitive performance was due to a major generalized improvement of the whole distribution of response Time and, although the benefit effect was small, it was consistent throughout the entire range of Reaction Times.

Donald Laming - One of the best experts on this subject based on the ideXlab platform.

  • A critical comparison of two random-walk models for two-Choice Reaction Time
    Acta Psychologica, 2002
    Co-Authors: Donald Laming
    Abstract:

    Abstract Two random-walk models for two-Choice Reaction Time, being the sequential probability ratio test model initially suggested by Stone and the relative judgment theory recently proposed by Link, are here compared. The comparison shows the precise mathematical relation between the models, the predictions they have in common, and two points at which they differ. Three experiments concerned with the effect of stimulus probability on two-Choice Reaction Time are examined with respect to three predictions from the models. In this three-way comparison the two models are more like each other than either is to the data; a greater variety of phenomena is revealed than either model can at present accommodate.