State-dependent learning refers to situations in which memory retrieval is enhanced when an individual is in a similar psychological state to when the information’s first encoded. For example, being under the influence of alcohol at retrieval can be beneficial to memory recall if alcohol was ingested at the time of encoding. This phenomena differs from context-dependent learning wherein the external environment influences memory recall rather than internal mental states.
Smith, S. M., & Vela, E. (2001). Environmental context-dependent memory: A review and meta-analysis. Psychonomic bulletin & review, 8(2), 203-220.
Eich, J. E. (2014). State-dependent retrieval of information in human episodic memory. Alcohol and Human Memory (PLE: Memory), 2, 141.