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. Author manuscript; available in PMC: 2009 Jul 24.
Published in final edited form as: Clin Neurophysiol. 2007 Jun 18;118(10):2128–2148. doi: 10.1016/j.clinph.2007.04.019

Figure 2.

Figure 2

Schematic illustration of the P300 context-updating model (Polich, 2003). Stimuli enter the processing system and a memory comparison process is engaged that ascertains whether the current stimulus is either the same as the previous stimulus or not (e.g. in the oddball task, whether a standard or a target stimulus was presented). If the incoming stimulus is the same, the neural model of the stimulus environment is unchanged, and sensory evoked potentials (N100, P200, N200) are obtained after signal averaging. If the incoming stimulus is not the same and the subject allocates attentional resources to the target, the neural representation of the stimulus environment is changed or updated, such that a P300 (P3b) potential is generated in addition to the sensory evoked potentials. Reprinted with permission from Kluwer/Spring Publishing (Copyright 2003).