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Recordings of stellar nerve activity were made during escape responses in living squid. Short-latency activation of the giant axons is triggered by light-flash stimulation that elicits a stereotyped startle-escape response and powerful jet. Many other types of stimuli produce a highly variable, delayed-escape response with strong jetting primarily controlled by a small axon motor pathway. In such cases, activation of the giant axons is not necessary for a vigorous escape jet. When they are utilized, the giant axons are not activated until well after the non-giant system initiates the escape response, and excitation is critically timed to boost the rise in intramantle pressure. Squid thus show at least two escape modes in which the giant axons can contribute in different ways to the control of a highly flexible behavior.

Jet-propelled escape in the squid Loligo opalescens: concerted control by giant and non-giant motor axon pathways.