Fig. 7From: Impacts of stimulus parameters and configurations on motor cortex direct electrical stimulation using intrinsic optical imaging: a pilot studyExperimental paradigms. The optical window was opened over the primary motor cortex. Electrical stimulation was delivered through an ECoG array. In conditions of monopolar vs. bipolar stimulation and electrode spacing, charge-balanced biphasic square pulses were applied with cathodic (negative) phase first. In conditions of multi-channel configurations and interleaved stimulation, cathodic pulses were appliedBack to article page