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Say a sophiscated scientist in the 19th century saw this video.

Is there a way for that scientist to prove, using only the methodologies available at that time, that the decapitated octopus doesn't regain the functions that a octopus brain normally has, for even a few seconds, when the soy sauce is applied?

Say a sophiscated scientist in the 19th century noted that applying soy sauce on a dead octopus leads to movement of the legs, as a result of the voltage differences resulting from the salt in the soy sauce. (For example, see this video)

Is there a way for that scientist to prove, using only the methodologies available at that time, that the decapitated octopus doesn't regain the functions that a octopus brain normally has, for even a few seconds, when the soy sauce is applied?

If a sophiscated scientist in the 19th century saw this video.

Is there a way for that 19th century scientist to prove the decapitalized octopus doesn't revive the functions that a octupus brain normally have for even a few second even when the soy sauce is applied?

Say a sophiscated scientist in the 19th century saw this video.

Is there a way for that scientist to prove, using only the methodologies available at that time, that the decapitated octopus doesn't regain the functions that a octopus brain normally has, for even a few seconds, when the soy sauce is applied?