This question ties together the NPR Fresh Air interview transcript and Textbook Chapter 5 materials.

In the beginning minutes of the interview, it was revealed that Dr. Barry did not have stereoscopic vision until later in her adult life. Refer to the section of the interview that begins with Dr. Barry stating, "So the key to stereoscopic vision is that the two eyes have to point or be aimed at the same place in space at the same time. And when that happens, the brain can integrate the information coming from the two eyes."

Which concept about seeing depth does this scenario about stereoscopic vision best relate to?

Linear perspective

Texture gradient

Binocular disparity

Proximity