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I think that the type of fMRI you are referring to is blood-oxygenation-level-dependent fMRI or BOLD fMRI. The principle behind MRI in general is the detection of proton signals from water molecules. The proton signal is generated by magnetizing the protons in tissue, which causes their spin to change. A subsequent powerful radio wave disrupts this spin ...


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Short answer I can be 75% sure that the lights are synchronized within 0.02 - 0.2 seconds of one another. Background Interesting question, but hard to answer! Because it has been unanswered for quite a while I will try to formulate an answer that may provide an approximate value for the minimal asynchrony perceivable. The temporal resolution of the visual ...


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Firstly you have to take into consideration that nociceptors do not adapt to stimulus. This means that a nociceptor will not only fire at the beginning of the stimulus, as seen in mechanoreceptors that have phasic responses, but will fire as long as the stimulus lasts. This type of response is called tonic response (see figure). Figure A shows the tonic ...


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Pain receptors, more precisely pain signal propagation, can be inhibited in several ways. One is, for example, fine touch receptors (mechanoreceptor in illustration) inhibit propagation of pain signal in spinal cord (a lot of pain processing happens in spinal cord): That is why humans often rub skin around or nearby injury, whether it is in joints or ...



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