Post-traumatic amnesia
Human studies
#### Human studies

One subsequent human study found no effects of vasopressin on memory.Jenkins, J. S., Mather, H. M., Coughlan, A. K., \& Jenkins, D. G. (1981\). Desmopressin and desglycinamide vasopressin in post\-traumatic amnesia. *Lancet, 39\.* The nonsignificant results were attributed to the study's many potential flaws, particularly its small sample size, the inability of vasopressin to penetrate the [blood brain barrier](/wiki/Blood_brain_barrier "Blood brain barrier") when administered as a nasal spray, inadequate dosing and differences in severity of head injury between the samples. However, Eames et al. (1999\) found statistically significant improvements on several tests of memory with the use of a vasopressin nasal spray, with no reported ill effects. Although the degree of improvement was mild, and it could be attributed to numerous other factors of the rehabilitative program, the lack of any ill effects suggests that vasopressin is, at the least, a possible enhancement for a treatment regimen.


What is the result of one human study on vasopressin's effect on memory?