"It takes just 1o minutes in most Thai gyms to see that Thais spar differently from westerners. There is a myth going around out there that Thais don’t “spar hard,” and that the reason for this is because they fight so frequently. This may be the case in some gyms, but from what I’ve seen and experienced at a few different gyms and youtube videos out there of champions sparring, there is indeed hard sparring in Thailand among Thais. What’s universally “light” about Thai sparring is the attitude brought by the guys engaging in the play fight. In Muay Thai the hardness of the strike is a demonstration of domination, not of aggression, at least not as we’d recognize the concept in the west. The difference is glaring. Let’s assume that like the subjects of the study, Thais also experience the dis-equal force of an opponent sparring for neurological reasons. The way that they respond to this experience is very different. You do not show what affects you in Muay Thai, you don’t acknowledge it visibly and the escalation is absolutely not manifested with an emotional burst. Rather, the escalation is theatrical, not even necessarily with greater force, and it’s used to re-set the equality between the two sparring; to correct or calibrate the dominance scale. Once that is done (or failed) things settle immediately back down to sanook, to play. If there is a point still to be scored or neutralized it is kept in the mind, for retribution."
- Sylvie, female MT fighter
^ CK did research and he realized MT sparring light is not completely true.