Cognitive lens
The cognitive lens is a component of the Diagnostic Lenses Framework ➚ . This lens guides diagnostic formulation in patients presenting with psychiatric symptoms in whom cognitive impairment suggests an underlying neurodegenerative process.
The cognitive lens is focused on presentations in which the onset and course of cognitive deficits support consideration of neurodegenerative disorders rather than primarily neurodevelopmental conditions or acquired brain injury. Diagnostic formulation of neurodevelopmental conditions is primarily informed by the morphologic and multisystemic lenses, while acquired brain injury is primarily informed by the lesional lens.
Cognitive profiles are explored according to the relative prominence of impairment across key domains, including memory, language, visuospatial function, and executive function, to facilitate neuropsychiatric differential diagnosis.
To begin, select the relevant cognitive domain below to explore associated differential diagnoses.
Clinical note:
Attention and orientation represent foundational cognitive processes required for valid assessment of higher-order cognitive domains. Impairment in these domains typically confounds further assessment of other cognitive domains and should prompt consideration of delirium, irrespective of whether a neurodegenerative condition is additionally present.
Delirium is typically associated with acute and potentially reversible cognitive disturbance and points toward an underlying active illness in another body system requiring prompt diagnosis and treatment. If unrecognized, delirium can be associated with significant morbidity and may be life-threatening. The diagnostic evaluation and management of delirium are outside the scope of this framework and warrant appropriate referral to relevant medical specialists as clinically indicated.