TY  - GEN
AU  - Spear,N E
AU  - Spitzner,J H
TI  - Effect of initial nonrewarded trials: factors responsible for increased resistance to extinction
SN  - 0022-1015
PY  - 1968///0213
KW  - Animals
KW  - Extinction, Psychological
KW  - Female
KW  - Rats
KW  - Reinforcement, Psychology
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.1037/h0024820
ER  -