<P> One of the important discoveries of infant depth perception is thanks to researchers Eleanor J. Gibson and R.D. Walk . Gibson and Walk developed an apparatus called the visual cliff that could be used to investigate visual depth perception in infants . In short , infants were placed on a centerboard to one side which contained an illusory steep drop ( `` deep side '' ) and another which contained a platform of the centerboard ( `` shallow side '' ) . In reality , both sides , covered in glass , was safe for infants to trek . From their experiment , Gibson and Walk found that a majority of infants ranging from 6 -- 14 months - old would not cross from the shallow side to the deep side due to their innate sense of fear to heights . From this experiment , Gibson and Walk concluded that by six months an infant has developed a sense of depth . However , this experiment was limited to infants that could independently crawl or walk . To overcome the limitations of testing non-locomotive infants , Campos and his colleges devised an experiment that was dependent on heart rate reactions of infants when placed in environments that reflected different depth scenarios . Campos and his colleagues placed six week - old infants on the `` deep end '' of the visual cliff , the six week - old infants ' heart rate decreased and a sense of fascination was seen in the infants . However , when seven month - old infants were lowered down on the same `` deep end '' illusion , their heart rates accelerated rapidly and they started to whimper . Gibson and Walk concluded that infants had developed a sense of visual depth prior to beginning locomotion . Therefore , it could be concluded that sometime at the spark of crawling around 4 -- 5 months , depth perception begins to strongly present itself . </P>
<P> One of the important discoveries of infant depth perception is thanks to researchers Eleanor J. Gibson and R.D. Walk . Gibson and Walk developed an apparatus called the visual cliff that could be used to investigate visual depth perception in infants . In short , infants were placed on a centerboard to one side which contained an illusory steep drop ( `` deep side '' ) and another which contained a platform of the centerboard ( `` shallow side '' ) . In reality , both sides , covered in glass , was safe for infants to trek . From their experiment , Gibson and Walk found that a majority of infants ranging from 6 -- 14 months - old would not cross from the shallow side to the deep side due to their innate sense of fear to heights . From this experiment , Gibson and Walk concluded that by six months an infant has developed a sense of depth . However , this experiment was limited to infants that could independently crawl or walk . To overcome the limitations of testing non-locomotive infants , Campos and his colleges devised an experiment that was dependent on heart rate reactions of infants when placed in environments that reflected different depth scenarios . Campos and his colleagues placed six week - old infants on the `` deep end '' of the visual cliff , the six week - old infants ' heart rate decreased and a sense of fascination was seen in the infants . However , when seven month - old infants were lowered down on the same `` deep end '' illusion , their heart rates accelerated rapidly and they started to whimper . Gibson and Walk concluded that infants had developed a sense of visual depth prior to beginning locomotion . Therefore , it could be concluded that sometime at the spark of crawling around 4 -- 5 months , depth perception begins to strongly present itself . </P>
when does a baby 's vision fully develop
when does a baby 's vision fully develop
4 -- 5 months
4 -- 5 months