Has the mechanical explanation of headlock defense ever been discussed by scientists to explain the chin(protuberantia mentalis)? A mechanical advantage that prevents death and being beaten up by another male would undergo a type of topological optimization that could be measured.
Positions where an assailant wraps his arm around a defendant's neck constitute 3/4rs of professional wrestling submissions. It's even more prevailant in amator wrestling where the contestants don't learn conplex arm and leg locks, in children, and in young adults.
When the neck is lowered, arm is barred from the neck, and the commentator shouts"will he manage to keep his chin down"
That kind of defense of the neck with the chin lowered can last 2-3 minutes, after which time the assailant's arms tire and the position changes.
The chin can therefore play a major role in human defense, mate selection, dominance tussles, and it's morphology may be designed to be vertically long and lower into the solar plexus.
There is a pit at the top of the sternum into which the chin fits when it is lowered.
Any kind of space under the chin can serve as leverage to push the head upwards and access the neck, so a chin that specificially points downwards flush with the solar chest and which deflects the arm upwards towards the mouth is an advantage to humans.
The chin size is promoted by testosterone which happens to be a hormote that encourages fighting.
The human chin is more powerful than in all other primates and can withstant more PSI force, which suggests that it is made to withstand a lot of clunking damage.
Actually 70 percent of paleolithic mandibular fractures could derive from fighting, that's in line with today's epedimeology figures, minus car accidents.
I believe that the chin comes from a range of selective factors, and i am curious about it's topological optimization, they precise shape and it's mechanical advantage. I believe that the current theories are true, and I wouldn't be surprised if the defense of westling positions can account for a lot of it's precise shape similar to a snow plough and it's alignment with the chest.
If any anthropologists are vaguely entertained by this theory the effectiveness of the chin in wrestling defense can be measured by studying archive of the number of successful defenses against wrestling strangleholds, which outnumber the attempts by 2-5.
To counter Johns odd claim about eye gouging as an alternative human wrestling action, punch damage accounts for 99% more hospital submissions than eye gouging.
Strangulation is unique to our species, so it is fitting to question: which hominids first used them? Was the bite force of a Neanderthal the previous best defense for choke holds? Is the Neanderthal physiology or mind not conducive to that kind of wrestling interaction? When did hominids develop aggression traits and cognitive forethought and a wiry physique that made choke holds possible?
Did the advent of a snowplow chin as a strangulation defense even facilitate the reduction of the jaw size of humans to it's present scale?
Anthropologically, human faces are not level with the genitals, as in dogs and monkeys, who inspect each other's genitals to gather information about their sexual state. Humans communicate with the eyes diverted towards the mouth, and face, they express their sexual state with mouth movements, side motions, and an array of gestures. The Chin also serves a display purpose in that end, so mechanical forces are not the only things that should be considered, but they count alot!! The development of complex facial expressions to describe sexual communication may have also encouraged the formation of a robust chin.
A lower and more forwards pointed chin protects the neck better, other animals develop pronounced features related to their rutting combats, crabs with a large arm, antlers, https://www.sciencedaily.com/releases/2012/07/120726142202.htm
Children learn head locks from an early age, head locks are a combat action singular to humans.
The human jaw is as strong or stronger than that of other primates. The incisors can deliver 70 PSI to the chin, and a human punch can deliver 1700 PSI. 6Mpa is about 800 pounds.
The chin serves as a crash guard to intercept whacks at the apex of the triangle, It is used as a life saving neck guard in the most common wrestling submission by providing no leverage under the jaw, and it is a masculin trait controlled by testosterone, quite contrary to the general neotenic traits of homo sapiens.