INTEGRATION OF MOVEMENTS IN LEARNING IN THE RAT 493 



Greater altitudinal points are found in curve III, constructed 

 from a rat's record given in table 15. The reflex thrusts in this 

 rat are also undeveloped and reflex excitability is at times de- 

 cidedly hyponormal. After the first trial, greater altitudinal 



CURVE 



CURVE II 



and greater descending points produce with 4 failures to solve 

 the problem in 30 minutes a very irregular curve. High alti- 

 tudinal points in the early trials are due to fluctuations in the 

 reflex thrusts with changes in the method to plunge the plane, 



