Performance IQ

Abstract

The amplitude of the response is also variable. The P300 has the useful property of being larger to rare stimuli, especially if they are targets. The more unlikely the stimu-lus is in the perception of the subject, the greater the amplitude of the response. A lesser amplitude of the response could also indicate less intensity of the subject's attention to the task. This concept can be used as a monitoring tool. There are many areas of research into brain function that use this ERP as the variable (Fig. 1). Studies look at such areas as visual working memory (for faces), error-related negativity, control of visuo-spatial attentional pro-cesses, presence of depression, aspects of schizophrenia in patients and families, and brain–computer interfacing.