Echolocating organisms represent their external environment using reflected auditory information from emitted vocalizations. This ability, long known in various non-human species, has also been documented in some blind humans as an aid to navigation, as well as object detection and coarse localization. Surprisingly, our understanding of the basic acuity… (More)
Compared with the echolocation performance of a blind expert, sighted novices rapidly learned size and position discrimination with surprising precision. We use a novel task to characterize the population distribution of echolocation skill in the sighted and report the highest known human echolocation acuity in our expert subject.
OBJECTIVE We present a device that combines principles of ultrasonic echolocation and spatial hearing to provide human users with environmental cues that are 1) not otherwise available to the human auditory system, and 2) richer in object and spatial information than the more heavily processed sonar cues of other assistive devices. The device consists of a… (More)
Functional changes in visual cortex as a consequence of blindness are a major model for studying crossmodal neuroplasticity. Previous studies have shown that traditionally visual cortical regions activate in response to a wide range of nonvisual tasks (Merabet & Pascual-Leone, 2010; Kupers & Ptito, 2013). However, the underlying computations, while often… (More)