RONALD E. MYERS 5O5 



responses being contingent on the eve masked or the particular receptor stimulated. 



Gerard. Downer reported in monkeys unilateral responses as far as pattern 

 vision was concerned but I believe colour discriminations crossed over. Have you 

 anv information on thisf 



Myers. Downer reported that interocular transfer of colour as well as of pattern 

 discrimination was prevented by prior section of optic chiasma and corpus callosum 

 in monkevs. He further maintained that after chiasma section alone the memory 

 mechanism for colour discrimination learning achieved bilateral expression while 

 that for pattern discrimination remained primarily of unilateral potential. He has 

 published tliis work only as an abstract (Downer, 1958) and did not describe the 

 basis for this conclusion. His interpretations seem to go in the same direction as ours 

 to suggest that the more simple task finds more effective bilateral expression than 

 more diflicult. However, we found bilateral memory development for more 

 simple pattern discrinnnation responses. 



