Over the past decade, electrocorticography (ECoG) has been used for a wide set of clinical and experimental applications. Recently, there have been efforts in the clinic to adapt traditional ECoG arrays to include smaller recording contacts and spacing. These devices, which may be collectively called "micro-ECoG" arrays, are loosely defined as intercranial devices that record brain electrical activity on the submillimeter scale. An extensible 3D-platform of thin film flexible microscale ECoG arrays appropriate for Brain-Computer Interface (BCI) application, as well as monitoring epileptic activity, is presented. The designs utilize flexible film electrodes to keep the array in place without applying significant pressure to the brain and to enable radial subcranial deployment of multiple electrodes from a single craniotomy. Deployment techniques were tested in non-human primates, and stimulus-evoked activity and spontaneous epileptic activity were recorded. Further tests in BCI and epilepsy applications will make the electrode platform ready for initial human testing.
Bibliographical noteFunding Information:
This work was supported by grants from the National Institutes of Health (NIH NIBIB 1R01EB009103–01 and 2R01EB000856–06) and in parts by the Wallace H Coulter Foundation Institutional Translational Partnership and a refinement grant from the Center for Alternatives to Animal Testing (terminal experiments) to LKH.
- Brain-computer interface
- Epilepsy monitoring