P300 COMPONENT
\pˈiː θɹˈiːhˈʌndɹəd kəmpˈə͡ʊnənt], \pˈiː θɹˈiːhˈʌndɹəd kəmpˈəʊnənt], \p_ˈiː θ_ɹ_ˈiː_h_ˈʌ_n_d_ɹ_ə_d k_ə_m_p_ˈəʊ_n_ə_n_t]\
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A late-appearing component of the event-related potential. P stands for positive voltage potential and 300 represents 300 millisecond poststimulus. Its amplitude increases with unpredictable, unlikely, or highly significant stimuli and thereby constitutes an index of mental activity. (From Campbell, Psychiatric Dictionary, 6th ed)
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