Intra-individual variability in behavior: links to brain structure, neurotransmission and neuronal activity.

By S. MacDonald, Lars Nyberg, Lars Bäckman. Trends in Neurosciences, 2006

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Increased Brain Signal Variability Accompanies Lower Behavioral Variability in Development (2008, background): “Critically, our focus was not on variability of the signal across individuals within a group (interindividual), but rather the single-trial variability within an individual (intraindividual) [18].”
Age-Related Changes in 1/f Neural Electrophysiological Noise (2015, background): “Both interindividual and intraindividual behavioral variability has been shown to correlate with structural, functional, and neuromodulatory systems (Macdonald et al., 2006).”
Competition between functional brain networks mediates behavioral variability (2008, background): “Because accumulating evidence suggests that IIV reflects the integrity of frontal lobe circuitry (Chuah et al., 2006; MacDonald et al., 2006; Stuss et al., 2003), functional connectivity analyses may be an optimal way to examine this behavioral phenomenon.”
Reaction time variability in ADHD: a meta-analytic review of 319 studies. (2013, background): “Neurological correlates of intraindividual variability include regions implicated consistently in ADHD, including dorsolateral prefrontal, orbital frontal, and anterior cingulate cortices (Bellgrove, Hester, & Garavan, 2004; MacDonald et al., 2006).”