Replicants can try to fake the appropriate emotional reaction — might even be programmed to fake it to themselves, such that even they don’t realize what they are — but there is always a split-second delay, which the trained operator can detect.
This makes sense with replicants who know they are replicants and are trying to avoid detection (I'm not sure why they would ever be 'programmed' to try to fake detection, the simpler explanation is that they know what the test is and are trying to avoid identification and death.) But it's different for Rachel. She thinks she is human and wouldn't be trying to game the test, yet it takes a long time for Deckard to assess her. So why is that? Either way...
...leading one to suspect that the Voight-Kampff test may not be measuring pure, unadulterated empathy in quite the way everyone seems to think it is....But in Ridley Scott’s preferred version of the film, the central theme falls apart, to be replaced with psychological horror’s equivalent of a jump scare: “Deckard himself is really a replicant, dude! What a mind fuck, huh?"
Those 2 statements contradict themselves, because Deckard himself being a replicant (who actually is never tested himself anyway) is an extension of blurring the lines between human and replicant, and what the Voight-Kampff test actually is testing (which already happens when Deckard tests Rachel.)
I feel like the idea of next-gen replicants like Rachel (and possibly Deckard) that blur the lines further is thematically consistent with the rest of the movie. I don't know what kind of social life Rachel has led, but if she has any friends or social interaction at all some sort of empathy would be needed to pass off as human. These kind of things are not explicit in the movie, which I think is mostly fine as the movie is more about the big picture of what makes us 'human', or what that even means ethically or experientially. The early replicants are basically psychotic so it's easy to have no ethical concerns about them even if they have agency and consciousness. But then what about succeeding versions that do come closer and closer to experiencing regular human existence?
This makes sense with replicants who know they are replicants and are trying to avoid detection (I'm not sure why they would ever be 'programmed' to try to fake detection, the simpler explanation is that they know what the test is and are trying to avoid identification and death.) But it's different for Rachel. She thinks she is human and wouldn't be trying to game the test, yet it takes a long time for Deckard to assess her. So why is that? Either way...
...leading one to suspect that the Voight-Kampff test may not be measuring pure, unadulterated empathy in quite the way everyone seems to think it is....But in Ridley Scott’s preferred version of the film, the central theme falls apart, to be replaced with psychological horror’s equivalent of a jump scare: “Deckard himself is really a replicant, dude! What a mind fuck, huh?"
Those 2 statements contradict themselves, because Deckard himself being a replicant (who actually is never tested himself anyway) is an extension of blurring the lines between human and replicant, and what the Voight-Kampff test actually is testing (which already happens when Deckard tests Rachel.)
I feel like the idea of next-gen replicants like Rachel (and possibly Deckard) that blur the lines further is thematically consistent with the rest of the movie. I don't know what kind of social life Rachel has led, but if she has any friends or social interaction at all some sort of empathy would be needed to pass off as human. These kind of things are not explicit in the movie, which I think is mostly fine as the movie is more about the big picture of what makes us 'human', or what that even means ethically or experientially. The early replicants are basically psychotic so it's easy to have no ethical concerns about them even if they have agency and consciousness. But then what about succeeding versions that do come closer and closer to experiencing regular human existence?