I imagine that that The change will be as with a "normal" subject.

There appears to be limited research in this area. However, you could expect to find an effect size roughly equal to 0.336 based on Savucu et al.

https://pdfs.semanticscholar.org/bc9e/d802ec7b54cf2ccb255b64a7f5f00f31db46.pdf

A previous review from 2010 may be able to give you a little more guidance. But this looks like an area that could benefit greatly from additional research.

https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0013297/

Good Luck!

Thank you