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 BIOLOGY : MECHANISM OF THE BRAIN The outside is always an inside Neuronal assemblies Neurons in primitive animals like hydra have nerve nets. These respond by coordinated action from sensory stimuli like food particles to engulf them .In higher animals these nerve nets multiplied in number for unrelated purposes as ganglions. The problem occurs in coordination of the various nerve nets as they frequently have common inter neurons serving different purposes.      In higher animals brain has a hierarchy of nerve nets. In mammals the basic nerve net is a map in cortex called hippocampus. The hippocampus has grid cells connected to afterent sensory inputs from propriceptive receptors which give inputs sequentially increasing with muscle movements and distance. It also has inputs from vision for objects, auditory sensations which occur linearly with time. A line of grid cells respond to all inputs but with different intensity depending on place of occurrence on the line....