Editing Human echolocation (section)

==Discrimination ability==
Echoes and other sounds can convey spatial data that are comparable in many respects to those conveyed by light.<ref name=Rosenblum2000>{{cite journal |journal=Ecological Psychology |year=2000 |volume=12 |issue=3 |pages=181–206 |title=Echolocating Distance by Moving and Stationary Listeners |author1=Rosenblum, L. D. |author2=Gordon, M. S. |author3=Jarquin, L. |doi=10.1207/S15326969ECO1203_1 |citeseerx=10.1.1.540.5965 |s2cid=30936808}}</ref> A blind traveler using echoes can perceive very complex, detailed, and specific features of the world from distances far beyond the reach of the longest cane or arm. Echoes can make information available about the nature and arrangement of objects and environmental features such as walls, doorways, recesses, overhangs, pillars, ascending curbs and steps, fire hydrants, pedestrians, parked or moving vehicles, trees and other foliage, and much more. Echoes can give detailed information about location (where objects are), dimension (how big they are and their general shape), and density (how solid they are). Location is generally broken down into distance from the observer and direction (left/right, front/back, high/low). Dimension refers to the object's height (tall or short) and breadth (wide or narrow).

By understanding the interrelationships of these qualities, much can be perceived about the nature of an object or multiple objects. For example, an object that is tall and narrow may be recognized quickly as a pole. An object that is tall and narrow near the bottom while broad near the top would be a tree.  Something that is tall and very broad registers as a wall or building. Something that is broad and tall in the middle, while being shorter at either end may be identified as a parked car. An object that is low and broad may be a planter, retaining wall, or curb. And finally, something that starts out close and very low but recedes into the distance as it gets higher is a set of steps.

Density refers to the solidity of the object (solid/sparse, hard/soft). Awareness of density adds richness and complexity to one's available information. For instance, an object that is low and solid may be recognized as a table, while something low and sparse sounds like a bush; but an object that is tall and broad and very sparse is probably a fence.{{sfn|Kish|1995}}