Electrical excitability of the angular gyrus.

Area of Science:

• Neuroscience
• Neurosurgery

Background:

• The angular gyrus (AG), located between the parietal and temporal lobes, has an unclear function.
• Understanding AG function is crucial for neurosurgical interventions and cognitive neuroscience.

Purpose of the Study:

• To assess the feasibility of intraoperative electrical stimulation of the angular gyrus in human patients.
• To explore potential functional outputs of the AG to motor pathways.

Main Methods:

• Electrical stimulation (bipolar and monopolar) of the AG was performed in five patients using neuronavigation.
• Compound muscle action potentials were recorded from contralateral arm muscles following stimulation.

Main Results:

• Monopolar stimulation elicited muscle responses in three of five patients, with latencies recorded.
• Bipolar stimulation produced motor responses in three patients, particularly with 40 Hz frequency and 4-6 second duration.
• This study is the first to report functional output from the AG to the motor cortex.

Conclusions:

• Intraoperative electrical stimulation of the angular gyrus is feasible.
• The results, though preliminary, are encouraging and support continued investigation into AG connectivity and function.