10 - 15 meters
||Human Homo sapiens
||The neural bases of multisensory processes [electronic resource] / edited by Micah M. Murray, Mark T. Wallace. Chapter 9 Perception of Synchrony between the Senses, Mirjam Keetels and Jean Vroomen, link 2nd paragraph
||Pöppel E. Grenzes des bewusstseins, Stuttgart: Deutsche Verlags-Anstal, translated as Mindworks: Time and Conscious Experience. New York: Harcourt Brace Jovanovich 1985. 1988. AND Pöppel E, Schill K, von Steinbüchel N. Sensory integration within temporally neutral systems states: a hypothesis. Naturwissenschaften. 1990 Feb77(2):89-91.PubMed ID2314478
||2nd paragraph:"Because of these differences [between sensory signals], one might expect that for audiovisual events, only those occurring at the so-called "horizon of simultaneity" (primary sources)—a distance of approximately 10 to 15 m from the observer—will result in the approximate synchronous arrival of auditory and visual information at the primary sensory cortices. Sounds will arrive before visual stimuli if the audiovisual event is within 15 m from the observer, whereas vision will arrive before sounds for events farther away. Although surprisingly, despite these naturally occurring lags, observers perceive intersensory synchrony for most multisensory events in the external world, and not only for those at 15 m."