A series of EEG PR studies by Lehmann et al. (2006) and Thatcher et al. (2008a, 2009a,b) are consistent with physiological models of EEG PR and have added to earlier studies by Varela (1995), Breakspear (2002, 2004), Freeman (2003), and Freeman et al. (2003) by measuring discontinuities of electrical potentials and current sources of the two main physiological processes that underlie PR, namely, phase shift followed by phase lock. Lehmann et al. (2006) and Thatcher et al. (2007) demonstrated temporal discontinuities of EEG current sources of about 40–250 ms. Thatcher et al. (2009a) studied the development of scalp electrode distance and PR times by measuring phase shift durations (range of about 30–70 ms) and phase lock durations (100–800 ms) from birth to 16 years of age where short distance inter-electrode pairing (6 cm) exhibited shorter phase shift duration and longer phase lock duration than longer distance inter-electrode parings (18–24 cm). Furthermore, it has been shown that phase shift duration is positively related to intelligence while phase lock duration is negatively related to intelligence measured by WISC-R I.Q. test (Thatcher et
