Double Simultaneous Stimulation
Bilateral simultaneous stimulation
Double simultaneous stimulation (DSS) is a method of testing afferent visual, somatosensory, and auditory pathways for signs of unilateral brain damage. The examiner presents a stimulus, typically using finger(s), on the side contralateral to and ipsilateral to the suspected lesion, as well as simultaneously on both sides.
A patient with unilateral damage will typically detect a single stimulation on the contralateral side, but identify only ipsilateral stimulation during bilateral simultaneous stimulation. This tendency to suppress (or neglect) the contralateral stimulation is also referred to as “extinction.” While unilateral damage may result in decreased or weakened registration of single, contralateral stimuli, these contralateral stimuli are not detected when in competition with stronger, ipsilateral stimuli. The term “clinical confrontation” was first used to describe the evaluative process (Oppenheim 1885)....
References and Readings
- Goldstein, G., & Sanders, R. D. (2004). Sensory-perceptual and motor function. In G. Goldstein, S. R. Beers, & M. Hersen (Eds.), Comprehensive handbook of psychological assessment: volume 1, intellectual and neuropsychological assessment (pp. 309–320). Hoboken: Wiley.Google Scholar
- Mesulam, M.-M. (1987). Attention, confusional states, and neglect. In M.-M. Mesulam (Ed.), Principles of behavioral neurology (pp. 125–162). Philadelphia: F.A. Davis.Google Scholar
- Oppenheim, H. (1885). Neurologisches Zentralblatt, 4, 529.Google Scholar