GATE 2021 XH5 – Question 47

Perception, Learning, Memory and Forgetting · Perception: Attention, organizing principles, Gestalt perception, depth perception and illusions · 2 marks · Multiple choice

Match depth cues P aerial perspective, Q motion parallax, R convergence, S linear perspective to descriptions: (i) inward turning of the eyes toward a nearby object; (ii) a distant mountain looks fuzzy; (iii) parallel lines seem to meet at the horizon; (iv) nearby objects appear to move oppositely as one travels in a vehicle.

P–(ii),Q–(iv),R–(i),S–(iii)
P–(ii),Q–(iii),R–(iv),S–(i)
P–(iv),Q–(i),R–(ii),S–(iii)
P–(iii),Q–(iv),R–(i),S–(ii)

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Correct answer: (A) P–(ii),Q–(iv),R–(i),S–(iii)

Explanation

Atmospheric haze produces aerial perspective(ii); relative retinal motion produces motion parallax(iv); eye rotation toward a near target is convergence(i); apparent meeting of parallels is linear perspective(iii). Thus A. Convergence is a binocular/oculomotor cue, while the others can provide monocular information.

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