First occurrence of hippocampal spatial firing in a new environment.
D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D003216:Conditioning, Operant / Q000502:physiology; D004777:Environment; D006624:Hippocampus / Q000502:physiology*; D008297:Male; D051381:Rats; D013037:Spatial Behavior; D013997:Time Factors