Mr Jacobs is 75 years old and presents to the GP with his wife who is concerned about a general decline in his wellbeing over the last few months. He has had several falls, and has become increasingly forgetful and low in mood. He has always had a very cheerful personality and his wife now feels he has changed entirely and has even started hallucinating, (which prompted her to bring him to the surgery today). After a lengthy history and noting a shuffling gait and rigidity on examination you suspect he may have dementia with Lewy bodies.
Which one of the following features in his history would not be consistent with this working diagnosis?