I have now read through:
“Reversal of food preferences of the white rat through controlled pre-feeding”; PT Young—The Journal of general psychology, 1940 - Taylor & Francis
“Appetite, palatability and feeding habit: a critical review”. PT Young—Psychological Bulletin, 1948
“Food-seeking drive, affective process, and learning”. PT Young—Psychological Review, 1949
None of them mention any experiments which match Feynman’s description even a little bit, and the hits for ‘sand’ all refer to rats digging, not constructing mazes.
I have now read through:
“Reversal of food preferences of the white rat through controlled pre-feeding”; PT Young—The Journal of general psychology, 1940 - Taylor & Francis
“Appetite, palatability and feeding habit: a critical review”. PT Young—Psychological Bulletin, 1948
“Food-seeking drive, affective process, and learning”. PT Young—Psychological Review, 1949
None of them mention any experiments which match Feynman’s description even a little bit, and the hits for ‘sand’ all refer to rats digging, not constructing mazes.