Mapping dementia and cognitive decline in testamentary capacity.

Cognitive assessment is central to the evaluation of testamentary capacity. Such assessment is currently performed in a subjective, unreliable and non-standardized manner. Dementia, a cognitive illness, poses one of the largest threats to testamentary capacity in modern society. A better understanding of the ways in which dementia related cognitive impairment can affect a testator's ability to meet the relevant legal criteria to make a will is needed. A review of the literature over the past ten years focusing on what cognitive abilities are required to satisfy the legal criteria for testamentary capacity has highlighted an alarming scarcity of work in this area. There is little discussion spanning beyond general acknowledgement of the importance of memory and executive function. The specifics of how cognitive impairment impacts the four limbs of Banks v Goodfellow are rarely addressed. Several additional areas of cognitive function of importance to assessing testamentary capacity are the subject of this article.