A shrunken world - micropsia after a right occipito-parietal ischemic stroke

Area of Science:

• Neuroscience
• Ophthalmology
• Perception

Background:

• Micropsia is a rare neurological condition characterized by the perception of objects as smaller than they are.
• Visual processing disorders can arise from focal brain lesions, impacting spatial awareness and object recognition.

Observation:

• A patient experiencing micropsia reported perceiving the external world at approximately 70% of its actual size.
• This subjective experience was objectively confirmed through experimental visual tasks.
• The patient had sustained a right occipito-parietal stroke, leading to visual field deficits.

Findings:

• Impaired perception of shape, location, and motion was noted in the patient's left visual field.
• Despite localized visual field deficits, the micropsia affected the entire visual field.
• The study proposes a higher-order compensatory process to reconcile interhemispheric visual information discrepancies.

Implications:

• This case provides insight into the complex neural mechanisms underlying visual perception and spatial scaling.
• Understanding such visual distortions can aid in diagnosing and managing rare neurological conditions.
• The findings suggest potential pathways for brain plasticity and compensatory strategies following focal brain injury.