But I'm not more aggressive—a behavior change often tied to testosterone. That's not surprising to Robert Sapolsky, ., a neuroendocrinologist at Stanford University and a leading researcher on stress and behavior. "It's really not the case that testosterone 'causes' aggressive behavior," he says. "Instead, it makes the brain more sensitive to social cues that trigger aggression. And in support of that, a guy's testosterone level isn't a very good predictor of how likely he is to be aggressive."
In many cases, a practitioner may not be targeting a trigger point, they will choose to use a cold laser to energize a larger area of damaged tissue in the body. In this case, a cold laser with a broad focus (larger than the size of a dime) and the correct wavelength are used to penetrate the deep tissue with photons direct energize the area. These large emitters can cover areas up to inches square. The larger treatment area increase the chances of stimulating any damaged "hot spots". Larger emitters also can reduce the treatment time and provide a more even energy distribution over a larger treatment area. The size of the treatment area and the depth of the treatment area often dictates a minimum power requirement. The following table shows sample dosages for a small/shallow and large/deep injury and calculates the treatment times to get the same energy concentration evenly distributed over the treatment area at the desired depth. This table illustrates how treatment area and depth increase the required dosage and then power determines the treatment time for that condition .