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We use immobility as an origin and reference for the measurement of locomotorbehavior; speed, the direction of walking and the direction of facing as thethree degrees of freedom shaping fly locomotor behavior, and cocaine as theparameter inducing a progressive transition in and out of immobility. In thisway we expose and quantify the generative rules that shape fruit fly locomotorbehavior, which consist of a gradual narrowing down of the fly's locomotorfreedom of movement during the transition into immobility and a preciselyopposite expansion of freedom during the transition from immobility to normalbehavior. The same generative rules of narrowing down and expansion apply tovertebrate behavior in a variety of contexts, Recent claims for deep homologybetween the vertebrate basal ganglia and the arthropod central complex, andneurochemical processes explaining the expansion of locomotor behavior invertebrates could guide the search for equivalent neurochemical processes thatmediate locomotor narrowing down and expansion in arthropods. We argue that amethodology for isolating relevant measures and quantifying generative ruleshaving a potential for discovering candidate behavioral homologies is alreadyavailable and we specify some of its essential features.

Searching for behavioral homologies: Shared generative rules for  expansion and narrowing down of the locomotor repertoire in Arthropods and  Vertebrates