>>I recently met a lady who had had a Thalamotomy 2 years ago and is continuing to have a wonderful reprieve from her tremor and rigidity.<< Hi, I joined this list because my father-in-law (74) has PD. He suffers from rigidity (no tremors) and dementia. The meds make him even more confused, and cause hallucinations. Does a thalamotomy have any effect on dementia? Thank you, Sheila