TY - GEN AU - Haddad,N F AU - Szalda-Petree,A AU - Karkowski,A AU - Foss,R L AU - Berger,L H TI - Wheel-running in discrete trial and operant paradigms under various effort requirements SN - 0031-9384 PY - 1994///1220 KW - Animals KW - Conditioning, Operant KW - Extinction, Psychological KW - Male KW - Motor Activity KW - Physical Exertion KW - Rats KW - Rats, Sprague-Dawley KW - Reinforcement Schedule KW - Running N1 - Publication Type: Journal Article UR - https://doi.org/10.1016/0031-9384(94)90291-7 ER -