approached significancep = 0.08
All other groups show reduced variance in bi-modal, relative to uni-modal conditions for visual responses: compare dark and light green bars in Fig 3 , this approached significance for 6–7 year olds and 8–9 year olds ( p = 0.08, p = 0.07 for groups 6–7 and 8–9 years, all other age groups p >0.1, from paired t -tests).