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lüll Determinants of the induction of cortical plasticity by non-invasive brain stimulation in healthy subjects Ridding MC; Ziemann UJ Physiol 2010[Jul]; 588 (Pt 13): 2291-304The ability to induce cortical plasticity with non-invasive brain stimulation (NBS) techniques has provided novel and exciting opportunities for examining the role of the human cortex during a variety of behaviours. Additionally, and importantly, the induction of lasting changes in cortical excitability can, under some conditions, reversibly modify behaviour and interact with normal learning. Such findings have driven a large number of recent studies examining whether by using such approaches it might be possible to induce functionally significant changes in patients with a large variety of neurological and psychiatric conditions including stroke, Parkinson's disease and depression. However, even in neurologically normal subjects the variability in the neurophysiological and behavioural response to such brain stimulation techniques is high. This variability at present limits the therapeutic usefulness of these techniques. The cause of this variability is multifactorial and to some degree still unknown. However, a number of factors that can influence the induction of plasticity have been identified. This review will summarise what is known about the causes of variability in healthy subjects and propose additional factors that are likely to be important determinants. A greater understanding of these determinants is critical for optimising the therapeutic applications of non-invasive brain stimulation techniques.|Aging/physiology[MESH]|Animals[MESH]|Attention/physiology[MESH]|Brain/*physiology[MESH]|Cerebral Cortex/drug effects/*physiology[MESH]|Electric Stimulation[MESH]|Electroencephalography[MESH]|Evoked Potentials, Motor[MESH]|Exercise/physiology[MESH]|Female[MESH]|Humans[MESH]|Male[MESH]|Neuronal Plasticity/drug effects/genetics/*physiology[MESH]|Periodicity[MESH]|Sex Characteristics[MESH]|Synapses/physiology[MESH]|Transcranial Magnetic Stimulation[MESH] |