Reaction time and variability

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August undefined, 2024

We conducted our analyses with three datasets. In all datasets, all participants performed a gradCPT. The gradCPT is a well-validated test of sustained attention, … See more WebSep 23, 2024 · Working memory and reaction time variability partially statistically mediated the relationship between ADHD PRS and ADHD traits, explaining 14% and 16% of the …

Reaction Time Variability and Brain White Matter Integrity

WebFor instance, summarizing the data from projects by Salthouse (2010a, 2010b, 2010c) and Rönnlund et al. (2005 and Rönnlund et al. (2006), he concludes the following: “Although age-related increases in between-person variability are sometimes found (e.g., Rabbitt, 1993) … this is not the case in these data” (p. 2). Salthouse proceeds to ... WebReaction time (RT) variability on a Stop Signal task was examined among children with attention deﬁcit hyperactivity disorder (ADHD) symptoms and/or dyslexia in comparison to typically devel-oping (TD) controls. Children’s go-trial RTs were analyzed using a novel ex-Gaussian method. green phone wallpaper

Intra-individual reaction time variability in schizophrenia, …

WebSep 1, 2024 · We found that the P600 amplitude was significantly larger during periods of low reaction time variability (high sustained attention) than in periods of high reaction … WebThe decision and movement time components of a visual choice reaction-time task were examined using students and visitors to a university exhibition. ... Mean and intraindividual variability of simple RT (SRT) and 4-choice RT (CRT) were measured in 1,994 visitors to science festivals held in Edinburgh, Scotland, in 2008 and 2009 and in ... WebJun 15, 2024 · Neurophysiological work has associated larger neural variability during motor preparation with longer reaction time (RT) and larger movement variability, implying that movement variability decreases with increasing RT. Here, we recorded over 30,000 reaching movements in 11 human participants who moved to visually cued targets. green phone with keyboard

Genome-wide association study in 404,302 individuals identifies 7 ...

Is intraindividual reaction time variability an independent ... - PLOS

WebJan 18, 2024 · Reaction-time variability was higher during task-unrelated thoughts, freely moving thoughts, and thoughts not automatically constrained. Error bars indicate SEM. * P < 0.05 and ** P < 0.0125. Open in viewer Mean reaction time across conditions was 500 ms ( … WebAug 1, 2013 · RT variability refers to inconsistency in an individual's speed of responding, measured in seconds or milliseconds, and has been argued to reflect a subset of … green phone symbolWebDec 1, 2009 · Traditionally, reaction time (RT) was conceived of as an average speed of a number of responses made by an individual, or mean RT. Increasingly, however, intraindividual variability in reaction… Expand 1 View 1 excerpt Modeling Within-Person Variance in Reaction Time Data of Older Adults P. Rast, D. Zimprich Psychology 2011 fly southwest air

"WebJan 25, 2024 · We then consider the cognitive and neurobiological theoretical underpinnings of the construct before providing a description of the various methods and metrics that have been used to compute measures of variability – reaction time cut-offs, raw and residualized intraindividual standard deviations, coefficient of variation, ex-Gaussian curve ... " - Reaction time and variability

Reaction time and variability

The importance of intraindividual variation in reaction time

WebApr 4, 2024 · Reaction time variability (RTV), reflecting fluctuations in response time on cognitive tasks, has been proposed as an endophenotype for many neuropsychiatric disorders. There have been no large-scale genome wide association studies (GWAS) of RTV and little is known about its genetic underpinnings. WebOct 15, 2012 · Reaction time variability was measured as the standard deviation of participants’ reaction time for correct answers on the two nonshifting trials in the Navon-like task and correct answers on the go/no-go task (see descriptions above). Individual scores were standardized and aggregated into one composite score (r = .36–.65, p < .001).

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WebDec 16, 2014 · Reaction time is one of the important methods to study a person’s central information processing speed and coordinated peripheral movement response. … WebReaction time is the length of time it takes to respond to a stimulus. Reaction time is important when driving, when playing sports, in emergency situations, and in many day-to …

WebAug 9, 2024 · Intraindividual variability of reaction time (IIVRT), a proposed cognitive marker of neurobiological disturbance, increases in old age, and has been associated with dementia and mortality. The extent to which IIVRT is an independent predictor of mortality, however, is unclear. This study investigated the association of IIVRT and all-cause mortality while … WebSep 1, 2024 · Reaction time variability is the trial to trial fluctuation in response time to a given task [7]. Reaction time variability is thought to occur due to fluctuations in the efficiency of neural networks supporting attention and executive functions [8], potentially due to vascular lesions (i.e. white matter hyperintensities) in the frontal lobe [9].

WebObjective: Reaction time variability (RTV) has been estimated using Gaussian, ex-Gaussian, and diffusion model (DM) indices. Rarely have studies examined interrelationships among these performance indices in childhood, and the use of reaction time (RT) computational models has been slow to take hold in the developmental psychopathology literature. WebJan 1, 2024 · Intraindividual variability is broadly defined as the fluctuation in an individual’s cognitive performance over time. This can refer to the moment-to-moment fluctuation in reaction time on a single task, variation across multiple tasks in a cognitive battery, or a single task repeated over a period of days, months, or years. Background

WebApr 7, 2024 · This study aimed to enhance the real-time performance and accuracy of vigilance assessment by developing a hidden Markov model (HMM). Electrocardiogram (ECG) signals were collected and processed to remove noise and baseline drift. A group of 20 volunteers participated in the study. Their heart rate variability (HRV) was measured to …

green phosphate coatingWebNov 1, 2024 · We found that the P600 amplitude was significantly larger during periods of low reaction time variability (high sustained attention) than in periods of high reaction time variability (low sustained attention). In contrast, the amplitude of the N400 was not affected by reaction time variability. flyspearWebMost studies of reaction time variability implicitly assume that heightened reaction time variability reflects occasional lapses in attention, and the dominant neurophysiological … greenphos tabletsWebFeb 1, 2008 · Intra-individual reaction time variability (IIV) in neuropsychological task performance reflects short term fluctuations in performance. Increased IIV has been reported in patients with schizophrenia and could be related to a deficient neural timing mechanism, but the role of IIV in adult patients with other psychiatric disorders has not … flys out or flies outWebApr 7, 2024 · Unlike prior studies of cognitive performance and variability, we modeled variability directly and distinct from mean performance using a dynamic structural … green phosphor pvs 14WebAug 1, 1992 · Individual differences in the trial-to-trial variability of reaction time (RT), indexed by the standard deviation of the individual's RTs over n trials (RTSD), generally has a larger negative correlation with psychometric g than … green phosphor monitorWebInhibition, memory, temporal discounting, decision-making, timing, and intraindividual variability in reaction time have emerged as key cognitive domains for understanding neurocognitive deficits in individuals with ADHD. In the domain of inhibition, motor inhibition has been studied most extensively, with deficits demonstrated in both ... flyspecked furniture