Editing Parallel processing (psychology) (section)

== Depth ==
To sense [[Depth perception|depth]], humans use both eyes to see three dimensional objects. This sense is present at birth in humans and some animals, such as cats, dogs, owls, and monkeys.<ref>{{Cite journal |last1=Nityananda |first1=Vivek |last2=Read |first2=Jenny C. A. |date=2017-07-15 |title=Stereopsis in animals: evolution, function and mechanisms |url=https://doi.org/10.1242/jeb.143883 |journal=Journal of Experimental Biology |volume=220 |issue=14 |pages=2502–2512 |doi=10.1242/jeb.143883 |issn=0022-0949 |pmc=5536890 |pmid=28724702}}</ref> Animals with wider-set eyes have a harder time establishing depth, such as horses and cows. A special depth test was used on infants, named [[Visual cliff|The Visual Cliff]].<ref name=":1">{{Cite book |last=Myers |first=David G. |url=http://worldcat.org/oclc/1273977481 |title=Exploring Psychology |date=16 September 2021 |publisher=Macmillan Higher Education |isbn=978-1-319-42980-5 |oclc=1273977481}}</ref> This test consisted of a table, half coated in a checkerboard pattern, and the other half a clear plexiglass sheet, revealing a second checkerboard platform about a foot below. Although the plexiglass was safe to climb on, the infants refused to cross over due to the perception of a visual cliff. This test proved that most infants already have a good sense of depth. This phenomenon is similar to how adults perceive heights.

Certain cues help establish depth perception. [[Depth perception|Binocular cues]] are made by humans' two eyes, which are subconsciously compared to calculate distance.<ref>{{Cite book |last=W. |first=Eysenck, Michael |url=http://worldcat.org/oclc/1150999656 |title=Cognitive psychology : a student's handbook |year=2020 |publisher=Psychology Press |isbn=978-1-138-48221-0 |oclc=1150999656}}</ref> This idea of two separate images is used by 3-D and VR filmmakers to give two dimensional footage the element of depth. [[Monocular cues]] can be used by a single eye with hints from the environment. These hints include relative height, relative size, linear perspective, lights and shadows, and relative motion.<ref name=":1" /> Each hint helps to establish small facts about a scene that work together to form a perception of depth. Binocular cues and monocular cues are used constantly and subconsciously to sense depth.