title: A rapid cycling dual shutter control system.
mesh_terms: D000200:Action Potentials; D000818:Animals; D055590:Electromagnetic Phenomena; D004581:Electronics; D008974:Mollusca / Q000502:physiology; D010775:Photic Stimulation / Q000295:instrumentation*; D010786:Photoreceptor Cells / Q000502:physiology