视觉(Vision)

详细内容

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humanvisionlikethatofotherprimateshasevolvedinanarborealenvironment.inthedenseplexworldofatropicalforest,itismoreimportanttoseewellthattodevelopanacutesenseofsmell.inthecourseofevolutionmembersoftheprimatelinehaveacquiredlargeeyeswhilethesnouthasshrunktogivetheeyeanunimpededview.

ofmammalsonlyhumansandsomeprimatesenjoycolorvision.theredflagisblacktothebull.horsesliveinamonochromeworld.lightvisibletohumaneyeshoweveroupiesonlyaverynarrowbandinthewholeelectromagicspectrum.

ultravioletraysareinvisibletohumansthoughantsandhoneybeesaresensitivetothem.humansthoughantsandhoneybeesaresensitivetothem.humanshavenodirectperceptionofinfraredraysunliketherattlesnakewhichhasreceptorstunedintowavelengthslongerthan0.7micron.

theworldwouldlookeerilydifferentifhumaneyesweresensitivetoinfraredradiation.theninsteadofthedarknessofnight,wewouldbeabletomoveeasilyinastrangeshadowlessworldwhereobjectsglowedwithvaryingdegreesofintensity.buthumaneyesexcelinotherways.

theyareinfactremarkablydiscerningincolradation.thecolorsensitivityofnormalhumanvisionisrarelysurpassedevenbysophisticatedtechnicaldevices.