Rand, Debbie OT, PhD; Kizony, Rachel OT, PhD; Weiss, Patrice (Tamar) L. OT, PhD  The Sony PlayStation II EyeToy: Low-Cost Virtual Reality for Use in Rehabilitation  Journal of Neurologic Physical Therapy:  December 2008 - Volume 32 - Issue 4 - pp 155-163 

You can download the pdf of the journal here:

journals.lww.com/jnpt/Abstract/2008/12000/The_Sony_PlayStation_II_EyeToy__Low_Cost_Virtual.2.aspx

Feasibility of Using the Sony PlayStation 2 Gaming Platform for an Individual Poststroke: A Case Report Flynn, Sheryl; Palma, Phyllis; Bender, Anneke Journal of Neurologic Physical Therapy. 31(4):180-189, December 2007.  

You can download the pdf of the journal here:

journals.lww.com/jnpt/Fulltext/2007/12000/Feasibility_of_Using_the_Sony_PlayStation_2_Gaming.5.aspx

Feel free to add links below!!  Thank you!!!