How is phase reversal cortical mapping conducted?

Phase reversal cortical mapping is primarily conducted by utilizing a grid placed on the surface of the brain to monitor sensory responses. This technique involves recording electrical activity from specific areas of the cortex in response to stimuli, allowing clinicians to identify functional regions responsible for various sensory processes. By stimulating the cortex and observing the corresponding sensory responses, it is possible to map the area of the brain associated with particular functions, enhancing the understanding of cortical organization.

The other methods mentioned, such as placing electrodes on the spinal cord or focusing solely on peripheral nerve stimulation, do not provide the comprehensive mapping needed for understanding cortical functions directly. Additionally, using ultrasound to detect brain waveforms is not suitable for phase reversal mapping, as it does not directly provide information about the cortical activity involved in sensory processing. Thus, the correct approach relies on the use of a grid on the brain for effective phase reversal cortical mapping.