Another advantage of EEG is that experimental conditions are designed such that attrition is relatively low. Our recent infant EEG work has attrition rates of 0–12% due to excessive movement artifact or crying (Bell, 2012; Cuevas & Bell, 2011; Cuevas, Raj, & Bell, 2012b). Attrition rates for two- and three-year-old children are higher (30–45%), typically due to refusal to wear the EEG cap, cap removal during the session, or excessive movement artifact (Cuevas, Raj, & Bell, 2012a; Morasch & Bell, 2011; Wolfe & Bell, 2007). Attrition rates drop to 20% by age four as children become more tolerant of the EEG cap and exhibit less movement during recording (Wolfe & Bell, 2004, 2007).
