There are very few human studies on the benefits of enriched environment, despite the larger success seen in rodent studies.
I could find only the following studies on EE, stroke patients by the same group:
https://www.ncbi.nlm.nih.gov/pubmed/23627534
https://www.ncbi.nlm.nih.gov/pubmed/25754445
I presume, the difficulty in assessment and control of mutiple parameters associated with such a concept may make such translation difficult to study.
Can adding novelty to daily activities amount to enriched environment?