Dear Chidinma,

From what other researchers have told me, language production can be a big issue for people with dementia so the kind of social interaction might be critical here. How about getting them to do something with their hands?

thanks Peter, noted. I suppose qualitative research approach is best.

any article that could be of help please?

I have found great use in Retrum's "Framework for Social Isolation."  

http://www.aarp.org/content/dam/aarp/aarp_foundation/2012_PDFs/AARP-Foundation-Isolation-Framework-Report.pdf

 Popular Memory Cafés in Wisconsin's Fox Valley Battle Social Isolation. Authors:McFadden, Susan H.; Koll, Alexandra

not sure which direction you want to take but I really like the above article

Look at Yvonne Lu's work from Indiana University and also an intervention called Time Slips. I think these may be helpful