Polich updating p300

Generally speaking, improbable events will elicit a P3b, and the less probable the event, the larger the P3b amplitude.

However, in order to elicit a P3b, the improbable event must be related to the task at hand in some way (for example, the improbable event could be an infrequent target letter in a stream of letters, to which a subject might respond with a button press).

It is usually elicited using the oddball paradigm, in which low-probability target items are mixed with high-probability non-target (or "standard") items.This shows two important findings: first, that this late positivity occurred when uncertainty about the type of click was resolved, and second, that even an absence of a stimulus would elicit the late positive complex, if said stimulus was relevant to the task.These early studies encouraged the use of ERP methods to study cognition and provided a foundation for the extensive work on the P300 in the decades that followed.found that ERP responses to visual stimuli differed depending on whether the stimuli had meaning or not.They showed subjects two kinds of visual stimuli: numbers and flashes of light.

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