The claustrum is a narrow subcortical brain structure that resides between the striatum and insular cortex. The function of the claustrum is not fully described. and while our previous work supports a role for the claustrum in top-down cognitive control of action. other evidence suggests the claustrum may be involved in detecting salient changes in the external environment. https://www.roneverhart.com/Medline-Guardian-Toilet-Safety-Frame-Fall-Prevention-Toilet-Rails/