Eleanor gibson and richard walk used a visual cliff with a glass-covered drop-off to examinebehavior in crawling infants. even when coaxed by their mothers to crawl out onto the glasscovering, most infants refused to do so, indicating that they had developed which of the following?
1. depth perception2. selective attention3. perceptual constancy4. procedural memory5. sensory adaptation

1. Depth perception      

Explanation:

Depth perception: In psychology, the term depth perception referred to as the visual ability of an individual to perceive the world around them in three dimensions, along with the ability to discover the distance of an object concerning the person.

Depth perception is being ascertained in monocular i.e, with one eye as well as binocular i.e, with both the eyes. Thereby, the monocular cue or vision is bad in determining or explaining the depth.

Causes:

1. Blurred vision.

2. Strabismus, etc.  

rain should be the answer.

answer; vygtosky's theory;