Hi. Mum was acting strangely today. She has in the past, had emotional outbursts - crying etc, which she was doing today. She asked me for a carrier bag (eventually, -had difficulty explaining what she wanted ), and then lifted up her top and was trying to tie it around her waist. When I asked what she was doing, she just started wailing. I am scared she is developing some kind of dementia. Is this normal with PSP?