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Intraindividual Variability in ADHD and Its Implications for Research of Causal Links

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Part of the book series: Current Topics in Behavioral Neurosciences ((CTBN,volume 9))

Abstract

Intraindividual variability (IIV) – reflecting short-term (within-session), within-person fluctuations in behavioral performance – and, specifically, reaction time (RT) variability, is strongly linked with attention-deficit hyperactivity disorder (ADHD) both at the phenotypic and genetic levels. Phenotypic case–control comparisons show a consistent and robust association between ADHD and RT variability across a broad range of cognitive tasks, samples, and age ranges (from childhood to adulthood). The association does not appear to be a nonspecific effect mediated by lower general cognitive ability. The finding from quantitative genetic studies of the shared genetic etiology between ADHD and RT variability is similarly robust, replicating across tasks, samples, and definitions of ADHD. Molecular genetic studies have produced intriguing initial findings: increasing sample sizes and replications across datasets remain priorities for future efforts. While the field has come a long way from considering increased RT variability in ADHD as the “noise” or “error” that we need to reduce in our data, the investigation of the causal pathways is only beginning. The neural basis of IIV is being investigated, with initial data pointing to a crucial role of fronto-striatal systems in controlling behavioral consistency. Several theories have been put forward to account for the observed IIV in ADHD, including accounts of arousal regulation, temporal processing and the “default-mode network.” For the wider implications of the IIV phenomenon to be fully realized, we need to learn further about the underlying processes, their developmental context, and about shared and unique causal pathways across disorders where high RT variability is observed.

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Notes

  1. 1.

    To analyze the temporal structure of reaction time series, reaction time series can be correlated with themselves (auto-correlations) by correlating a given RT with the next RT (lag 1), next-but-one RT (lag 2), and so on. A significant auto-correlation of lag 6 means that there is a relationship between the RT of a given trial and the RT six trials later.

Abbreviations

BA:

Brodman area

CPT:

Continuous performance test

CV:

Coefficient of variation

DAT:

Dopamine transporter

DMN:

Default-mode network

EEG:

Electro-encephalography

FEF:

Frontal eye fields

fMRI:

Functional magnetic resonance imaging

GWAS:

Genome wide association study

IIV:

Intraindividual variability

MEG:

Magneto-encephalography

MFFT:

Matching familiar figures test

MPH:

Methylphenidate

ODD:

Oppositional Defiant Disorder

PET:

Positron emission tomography

PFC:

Prefrontal cortex: dl (dorsolateral), dm (dorsomedial), vl (ventrolateral)

RT:

Reaction time

SMA:

Supplementary motor area

SSRT:

Stop signal reaction time

TB1:

Traumatic brain injury

TMT:

Trail making test

TOVA:

Test of variables of attention

WAIS:

Wechsler Adult Intelligence Scale

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Correspondence to Jonna Kuntsi .

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Kuntsi, J., Klein, C. (2011). Intraindividual Variability in ADHD and Its Implications for Research of Causal Links. In: Stanford, C., Tannock, R. (eds) Behavioral Neuroscience of Attention Deficit Hyperactivity Disorder and Its Treatment. Current Topics in Behavioral Neurosciences, vol 9. Springer, Berlin, Heidelberg. https://doi.org/10.1007/7854_2011_145

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