Lecture on Sensation: Monocular Depth Cues

Introduction

• Focus on monocular depth cues, unlike binocular cues which involve both eyes.
• Monocular cues can be used even with one eye, like a pirate with an eye patch.

Monocular Depth Cues

• Interposition (Occlusion):

  • One object blocking another is perceived as being closer.
  • Depth perception is based on the blocking of objects.

• Relative Size:

  • Objects of a known standard size appear larger when closer.
  • If objects are the same size, the one taking up more retinal space is closer.
  • Example: Cars of the same size, larger ones appear closer.

• Convergence/Linear Perspective:

  • Parallel lines appear to converge as they move away from the viewer.
  • Example: Railway tracks appearing to meet at a distance.

• Light and Shadow:

  • Objects in front are well-lit, and objects behind cast shadows.
  • Shadows help determine the position and depth of objects.
  • Example: A shadow indicates a ball is above the ground.

• Relative Clarity (Texture):

  • Objects with more texture and detail are perceived as closer.
  • Blurry objects appear farther away.
  • Example: Clear can seems closer than a blurry one.

Interesting Fact

• Pirates might cover one eye to preserve night vision for low-light conditions during attacks.

Conclusion

• Monocular depth cues are crucial for understanding depth with one eye.
• Encourage reading on binocular cues for a comprehensive understanding of depth perception.

Questions

• Students are encouraged to post any questions they have about the lecture.