Abstract: A system allowing for sensory stimulation, includes a programmable handheld device for visual, auditory and mechanical stimulation of the body, and associated computer software to analyze cortical evoked responses and map relevant areas on a brain sketch or rendering. The device generates single or series of pulses of programmable intensity/frequency and duration. It can be used by itself to manually stimulate modalities of interest, connected to a cortical signal amplifier as an external event source in order to record simultaneously the stimulation events and the cortical data for later analysis, plugged to a recording computer to show in real time activated cortical areas, or used for cognitive studies.