![]() ![]() Thus VSA is taking only a tiny portion of the response (if any) to be analysed, as opposed to traditional polygraph which is continuously measuring. Although a physiological response is generally initiated within milliseconds of a perceived threat they are different for each individual and can last for up to 15 seconds. Also, the only physiological reactions being recorded are at the moment of the subject’s answer which is a maximum of one second. Therefore these microphones are not collecting the correct frequencies to even display the physiological microtremor within an answer’s representation. Even the better ones do not go below 20Hz. ![]() No microphone available to the consumer is capable of picking up these frequencies with most microphones available only having frequency ranges of 100Hz – 10kHz. The physiological microtremor is present in all mammals at normal frequencies of 8-12Hz and under physiological stress is reduced to 4-6Hz. There are several issues with VSA apart from these results. ![]()
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