 The purpose of the Otto/Inga example is to challenge the assumption that only processes that take place “in the head” are psychological. When Otto consults his diary, he has the occurrent belief that MOMA is located on Fifty-third street. What the authors claim, in addition to this, is that, like Inga, who remembers it unaided, Otto also has the dispositional belief that MOMA is located on Fifty-third street before he consults his notebook. Otto’s capacity for storage and retrieval of memories extends beyond the brain, and encompasses the notebook as a resource, in the same way that Inga’s storage and retrieval depends on neural resources. Drayson and Clark (2019) discuss cases in which sufferers of Alzheimer’s disease perform poorly in standard tests but live alone successfully. Their homes are carefully scaffolded by personalised mnemonic props, including post-it notes, labelled pictures, strategically placed items, and messaging centres. If we are interested in an accurate assessment of an agent’s mental health we will be led astray if we do not find room in standard capacity tests for the role that an agent’s environment might play in their cognitive functioning. Further, the role of the environment must also be considered in therapeutic contexts: decisions to relocate subjects from their homes to residential care facilities, for example, are typically accompanied by decline in cognitive health.