PSYC 2906 EXAM Review Receptor Processes Class! Here is your mini exam review. So you know what type of questions to expect on the exam, I have attached 4 sample questions below. The exam consists of 17 short answer questions ranging from 3 - 7 points. All modules are accounted for in the exam. To ensure you are prepared for the exam, review the “Test Yourself” study questions online and this review. If you can answer all study questions satisfactorily, you will easily be able to attain an A level grade on your exam. Good Luck! Short Answer Questions Compare and contrast photopic vision and scotopic vision. (3 marks) The photopic and scotopic vision are both involved in the duplex theory of vision and there is arrange of intermediate ambient light intensity. However, the photopic system involves cones, daytime vision, and supports colour vision. While the scotopic vision involves rods, which are more sensitive to different wavelengths, is used for nighttime vision, and does not support colour vision. Name the oculomotor and monocular cues of depth perception. Explain how they work and how they each give us depth information. (6 marks) Two cues of oculomotor depth perception are vergence and accommodation. Vergence occurs when eyes rotate outward to see objects at a distance and inward for objects that are close. Vergence is an automatic process that provides feedback about the relative distance based on the brain’s ability to detect movement. It is effective within a range of about 2 meters. Accommodation is also an automatic process, to which the lens of eye adjusts so it may see objects at a distance and close by. Relaxing of the ciliary muscles allows objects to be seen far away and contracting them allows for objects to be seen up close. Define absolute threshold, subthreshold and suprathreshold. (5 points) An absolute threshold is defining as the smallest difference that can be detected between two stimuli. Subthreshold and suprathreshold may be defined as part of a two-point threshold. A subthreshold occurs when an individual detects only one stimulus and a suprathreshold occurs when two stimuli are detected. Name and describe two diseases of the eye. (5 points) One disease of the eye is glaucoma. It is a type of eye conditions that causes damage to the optic nerve. This damage causes high blood pressure and often leads to blindness in individuals over 60. Another disease of the eye is macular degeneration. This disease causes a blind spot in central vision due to the fovea being destroyed. This may occur from either wet or dry macular degeneration. The wet form will develop very quickly due to the abnormal growth of blood vessels, which leak beneath the retina. The dry form is more common and is caused by the degeneration of cells that create photopigments, impairing the function of photoreceptors.
