... us with a scale or levels of activation. The EEG, is a measurement of electrical activity in the cerebral cortex, reflecting changes in its frequency distribution with the level of arousal (Daniel, 1966) Underlying both SCL and EEG measures are shared sub-cortical networks; these include reticulo-thalamo-hypothalamo-cortical networks predicting a possible operational link between the two measures (Lim et al, 1995). This was further supported by Lim's findings, "These findings... bear testimony to the fact that the cerebral cortex and the autonomic circuits are structurally linked." (Lim et al, 1995, 159) There is much research outlining theories of response evocation and habituation. In Groves and Thompson (1970) dual-process theory, an eliciting stimulus triggers both an initial sensitisation (S) response followed by the habituation (H) response. S and H are products of the Central Nervous System having developed along separate neuronal pathways, it is their interaction whch triggers the elicitation of the response ...

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