Buck and Duffy (1980) and Borod et al. (1985) found evidence of deficits in spontaneous expressiveness in right brain-damaged (RBD) patients relative to LBD patients and controls. Using FACS, Mammucari et al. (1988) failed to replicate this result and questioned our methods and findings. This paper replies (a) that Mammucari et al. (1988)'s review of our work is selective and misleading; (b) that there are aspects of their study that can account for their null results, including the insufficient sensitivity of FACS for the measurement of spontaneous expressiveness; and (c) that the results of Mammucari et al. (1988) regarding "aversive eye movements" to a negative film in LBD and control, but not RBD, patients are in fact compatible with our findings. This paper also suggests a general strategy for the objective and comprehensive analysis of spontaneous emotional expressiveness.