Cognitive and behavioral deficits following bilateral thalamic stroke: a longitudinal study

Area of Science:

• Neuroscience
• Neurology
• Cognitive Psychology

Background:

• Bilateral paramedian thalamic ischemic lesions can cause severe neurological and cognitive deficits.
• Thalamic lesions are associated with memory impairments, disorientation, and executive dysfunction.

Observation:

• A patient (N.S.) with bilateral paramedian thalamic infarcts presented with topographical disorientation (TD) and confabulations.
• Initial symptoms included severe amnesic-confabulatory syndrome, dysexecutive deficits, memory disorders (visuo-spatial and verbal), and TD for both familiar and novel environments.
• Behavioral disinhibition and anosognosia for cognitive deficits were also noted.

Findings:

• Longitudinal follow-up over 43 months revealed a significant recovery from all observed cognitive impairments.
• The patient's case is unusual given the typical long-lasting deficits associated with this type of lesion.

Implications:

• This case highlights the potential for substantial neuropsychological recovery following bilateral paramedian thalamic lesions.
• Understanding the recovery trajectory in such cases can inform rehabilitation strategies and prognostication.
• Further research into thalamic lesion recovery mechanisms is warranted.