What type of recordings can be made using electrodes embedded in a thin sheet of plastic material?

Electrocorticographic recordings are made using electrodes that are positioned directly on the surface of the cerebral cortex. These electrodes can be embedded in a thin sheet of plastic material, which allows for a flexible and conformable method of adhering the electrodes to the surface of the brain. This technique is crucial during neurosurgical procedures because it allows for the direct recording of electrical activity from the cortex, providing real-time data that aids in monitoring brain function and identifying essential areas during surgery.

Using a thin sheet of plastic for embedding electrodes enhances stability and can minimize the risk of tissue damage, improving the quality of the recordings. This is particularly important for accurately diagnosing and monitoring various neurological conditions during surgical interventions.

The other options represent different types of electrophysiological recordings that utilize different methods and electrode configurations. For example, electrocochleography involves recording electrical potentials from the cochlea, electroretinography focuses on the retina, and electromechanical recordings pertain to muscle activity rather than direct cortical recordings. Thus, electrocorticography is distinct in its application and the type of measurements it facilitates.