24H 'Journal of Conipnrative Neurology and Psychology. 



Fig. 4. 



Tig. 3. — Curves of leaniin.u; (error curves) for t\Yeiity male 

 and twenty female dancers in white-black visual discrimina- 

 tion habit. Ordinates represent number of errors of choice 

 in series of ten tests (per day). Abscissje represent daily 

 series of tests, beginning with two preference series, A and B, 

 and continuing to the completion of the training. Curve for 

 males — • ; Curve for females 



Fig. 4. — Plasticity curves for twenty male, and twenty 

 female dancers, and for the race, in white-black discrimina- 

 tion habit. Ordinates represent indices of plasticity or modi- 

 fiability (/. c, the number of tests up to the point at which 

 CO no errors of choice were made in three successive series of 

 ten tests each). Abscissjie represent ages in mouths. Curve 



for males — - ; Curve for females ; Curve 



for race . 



Fig. 



