P300 EVENT RELATED POTENTIALS
\pˈiː θɹˈiːhˈʌndɹəd ɪvˈɛnt ɹɪlˈe͡ɪtɪd pətˈɛnʃə͡lz], \pˈiː θɹˈiːhˈʌndɹəd ɪvˈɛnt ɹɪlˈeɪtɪd pətˈɛnʃəlz], \p_ˈiː θ_ɹ_ˈiː_h_ˈʌ_n_d_ɹ_ə_d ɪ_v_ˈɛ_n_t ɹ_ɪ_l_ˈeɪ_t_ɪ_d p_ə_t_ˈɛ_n_ʃ_əl_z]\
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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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