A patient firmly and repeatedly insists that his wife, whom he acknowledges looks and sounds identical to his real wife in every way, is actually an impostor who has secretly replaced her, becoming suspicious and hostile toward her as a result. Before revealing the answer: is this false reconnaissance?

No, this is more consistent with Capgras syndrome than with simple false reconnaissance. False reconnaissance in its negative form involves a person being insisted to be a stranger without necessarily further elaboration; here, the fixed, elaborated delusional belief that an identical-looking double has replaced the real person, complete with acknowledged perfect resemblance and accompanying suspicion, is the defining pattern of Capgras syndrome rather than a simple failure of recognition.