Sight Distance and Reaction Time. Sight Distance. Sight distance means the distance from which you can see and identify a hazard. You often see an object before youâre able to identify it as a hazard. If the stopping distance to an object is greater than the sight distance, youâre in danger of hitting the object.
The major methodology of this approach is the single-case experiment, or N = 1 design. Although there are many kinds of N = 1 designs, the most common are the ABAB design and the multiple-baseline design. An ABAB design, or reversal design, allows a researcher to confirm a treatment effect by showing that behavior changes systematically with conditions of No Treatment (baseline) and Treatment.
Reversal therapy makes use of PET, or positron emission tomography, a noninvasive test that gives a better picture of a person's real risk of suffering a heart attack. PET testing can diagnose coronary artery disease early on, when treatment can make more of a difference for the patient's long-term survival. Not only is reversal therapy safer, more effective and less invasive than conventional treatments, it is far cheaper.