I haven't done any specific research on this, but these are my initial thoughts..<Wyvern> Example:
<Wyvern> When we get nervous or scared, we sweat.
<Wyvern> If you take away the emotion, can you perceive the feeling of sweating? Not on your skin, but what makes
<Wyvern> Another example would be when your heartrate speeds up.
<Wyvern> Like when you're really stressed. Take away the emotion. Can you perceive it?
<Wyvern> Can you make yourself sweat without emotion?
<Wyvern> Can you increase or decrease your heartrate?
I think sweating is a biological response to stimuli, stimuli requires processing information by the physical senses. The physical senses then trigger the nervous system controlled by the brain to release sweat. This process is automatic and doesn't require a conscious effort to do.
Now to answer your question we would try to isolate emotions from the variables and attempt to cause sweating. Physically this can be done for example, by clearing the mind and meditating in a hot room, or physiologically it could be done in a dream state where no external stimuli from the physical senses are affected.
In the hot room situation, a person might be able create a new sense of being conduit to allow understanding on how sweat could be generated outside of a hot room. This sounds very strange, but if you take into account that masters are able to disable pain purely with the power of the mind, then it is logical to assume that it is possible to control at least some aspects of our biological responses. In other words, someone could learn how to release sweet by thought alone as someone could learn to disable pain. Same applies for the heart rate.
In the dream situation, a person could attempt to trigger sweet by entering a "hot dream room". IN this case it would be purely physiological, since the hotness is being created in the mind alone and NOT a biological response to external physical stimuli. If sweating can be created in a dream state, we could argue that a physiological or mental response (intentional or unintentional) creates sweating, at least partially. There is also the purely instinctual response that would be very difficult to isolate (response to heat/cold/pain). This inability to isolate could be the reason why it would be so difficult to master such feats.
In the end, it might not be possible to isolate emotion since emotion is also tied to a physiological process, but it might be possible to change it. A type of emotion that is felt as fear initially, but manifested into the reserve would cause a paradigm shift allowing perceiving of a totally new emotion/sensation. A sense of stress being turned into a sense of deep relaxation causing a reduce heart rate, as a master could turn presumed pain into a sense of calmness.
Have a great day!