Dr. Satterlie has three primary research projects: (1) Control of locomotion in the marine pteropod mollusc Clione limacina. The primary focus is on neural mechanisms of locomotory speed control through central and peripheral modulatory mechanisms as well as more classical types of inputs to the locomotory system. (2) Control of locomotion of cubomedusae. Particular attention is on sensory modification of swimming activity and turning behavior. (3) A relatively new project involves the distinction between motivational states and arousal states in Clione. Our preliminary results suggest that an animal-wide serotonergic arousal system is modular in construction and multifunctional, functioning during several unrelated behaviors. Using this model system, we are pursuing neurophysiological descriptions of arousal and motivational state.