Clinical Scorecard: Enhancing Recovery from Hemianopia: The Role of Interareal Cross-Frequency Brain Stimulation
At a Glance
Category
Detail
Condition
Homonymous hemianopia following stroke
Key Mechanisms
Pathway-specific cross-frequency brain stimulation enhancing interareal oscillatory synchronization between primary visual cortex and medio-temporal area
Target Population
Adult stroke patients with visual field loss
Care Setting
Neurological rehabilitation and outpatient visual retraining programs
Key Highlights
Visual field loss affects approximately one-third of stroke survivors and significantly impairs daily activities.
Cross-frequency transcranial alternating current stimulation (cf-tACS) targeting V1 alpha and MT gamma oscillations enhances motion discrimination and visual field border shifts.
Behavioral improvements correlate with residual structural integrity of visual pathways and perilesional cortical activity.
Guideline-Based Recommendations
Diagnosis
Identify homonymous hemianopia via clinical visual field assessment post-stroke.
Evaluate residual structural fibers and perilesional activity using neuroimaging to inform prognosis.
Management
Implement intensive, tailored visual-attentional training protocols within the scotoma region.
Combine visual training with pathway-specific cf-tACS to enhance interareal synchronization and recovery.
Adopt non-invasive brain stimulation protocols that promote feedforward visual inputs to motion-sensitive areas.
Monitoring & Follow-up
Assess motion discrimination performance and visual field border changes regularly during rehabilitation.
Monitor oscillatory activity changes within visual processing pathways via EEG or related modalities.
Risks
No specific risks detailed; cf-tACS is non-invasive and used adjunctively with visual training.
Patient & Prescribing Data
Stroke survivors with chronic homonymous hemianopia
cf-tACS combined with visual retraining significantly improves motion discrimination and visual field extent, with efficacy linked to residual neural pathway integrity.
Clinical Best Practices
Early initiation of intensive visual-attentional training within the blind field to maximize recovery potential.
Use physiology-inspired, pathway-specific brain stimulation to augment traditional rehabilitation.
Tailor interventions based on individual residual structural and functional visual pathway assessments.
by Estelle Raffin, Michele Bevilacqua, Fabienne Windel, Pauline Menoud, Roberto F Salamanca-Giron, Sarah Feroldi, Sarah B Zandvliet, Nicola Ramdass, Laurijn Draaisma, Patrik Vuilleumier, Adrian G Guggisberg, Christophe Bonvin, Lisa Fleury, Krystel R Huxlin, Elena Beanato, Friedhelm C Hummel
