“…In eight studies, a neutral task [27, 30, 42, 47–49, 62, 64] including variables of absolute error [42, 48, 49, 62], constant error [30, 42], variable global error [30, 42], root mean square error [30], and maximal overshoot [49] was reported. In two studies, a mid-range task reporting on absolute [43, 69], constant, and variable global error was reported, and in three papers [48, 64, 65], no specification of the error measurement parameter was reported. All nine studies showed smaller joint positioning error for the healthy controls compared with the neck pain groups; the difference was statistically significant in five studies [27, 34, 47, 64].…”