Research Of Fish Behavior Control System

The research objectives of this project are designing an electrical stimulation systemfor underwater creatures and finding a method of behavior control. The core of fish brainfunction research and behavior control system design is the brain-machine interfacetechnology. It includes the design of the micro-stimulator and the microelectrode,stimulation of the brain to target positioning technologies, electrode implanting and fixingand research of waterproof method, as well as the analysis of brain function and neuralinformation.In early stage of research, the main tasks that had been completed were the researchof anatomical structure of the fish brain and cranial nerve electrophysiological function ofthe fish. In the research of the brain positioning technology, a method of positioning of thebrain on the basis of the characteristics of carp skull had been proposed, and athree-dimensional coordinate frame of brain positioning of the carp had been established.It can provide a relative accurate positioning method for locating various brain regions.The microelectrode that used in the signal acquisition and electrical stimulationexperiments are self-designed. Its electrical properties and biocompatibility are better thanthe electrode that previously used. In addition, a microelectrode implanting method hasbeen found at the base of the research of carp anesthesia and fixing, electrode fixing andthe design of waterproof method.In the EEG(electroencephalogram) acquisition and analysis experiments, thephenomenon that the cerebellum and the cerebellar lobe discharge synchronously in theEEG analysis of stationary and moving state was found, and that the signal showedspecific amplitude-frequency characteristics. When steering action occured, moreintensive Spikes appeared in the signal of cerebellum. It was found by analyzing thecerebellum and cerebellar lobe signal. It proved that cerebellum is the motor coordinationhub of the carp. In the electrical stimulation experiments, both of wired and wirelessstimulation were used. Stimulatory signals were current signal and pulse voltage signal.Stimulation on medial fasciculus of cerebellum can cause the forward movement and stimulation on two sides of motor area can cause the same side of steering actions. Whenthe location of stimulus point gets nearer from the motor area, the threshold of stimulationsignal becomes smaller. In two ways of brain stimulation and muscle stimulation, thetracking task that controlling a carp in a specific path is completed.