Wolpaw JR, Kamesar A. Heksor: the central nervous system substrate of an adaptive behaviour. J Physiol. 2022;600(15):3423-3452. 

Feng-Chen KC, Wolpaw J. Operant conditioning of H-reflex changes synaptic terminals on primate motoneurons. Proceedings of the National Academy of Sciences of the United States of America [Internet]. 1996;93:9206?9211. http://www.ncbi.nlm.nih.gov/pubmed/8799179

Carp JS. Monosynaptic EPSPs in primate lumbar motoneurons. Journal of neurophysiology [Internet]. 1993;70:1585?1592. http://www.ncbi.nlm.nih.gov/pubmed/8283216