A transient dominance of theta ERP component characterizes passive auditory processing: evidence from a developmental study

V. KOLEV; O. A. ROSSO; J. YORDANOVA

NEUROREPORT

Lippincott, Williams & Wilkins

Año: 2001 vol. 12 p. 2719 - 2796

0959-4965

This study analyzed relationships among co-existent EEG frequency responses during passive auditory stimulus processing. By applying quanti®ers based on wavelet entropy, it is demonstrated that a short-lasting ordering of the complex post-stimulus EEG signal occurs as a result of a transient synchronization in the theta frequency channel. Further, by using a developmental model it is shown that, independently of the frequency content of the background EEG and ERPs, a highly-ordered microstate in the ERP is always determined by theta frequency. Thus, transient dominance of synchronized theta oscillations may re¯ect an important functional mechanism subserving stimulus information processing.