31) Why don\'t we notice our retinal blood vessels? A) They cast only diffuse sh

Question

31) Why don't we notice our retinal blood vessels? A) They cast only diffuse shadows and are motionless. B) There are none. C) They lie behind the retina. D) They move too quickly. 32) Which best describes the field of vision science? A) It encompasses a multitude of disciplines B) It is concerned mainly with conscious perception. C) It is a branch of optical physics. D) It is primarily medical in nature 33) What might be the reason(s) that light travels through a great deal of neural matter before reaching the photoreceptors at the back of the retina? A) We have an inverted retina. B) A, B, and C are all reasons.. C) blood can be delivered more easily to the back of the eye than to the surface. D) the process of transduction-the turning of light energy into electrochemical energy within the nervous system-requires lots of energy that is obtained through the blood supply 34) Exploratory eye movements are necessary because A) the region of the retina that supports detailed vision is quite small. B) they add motion signals to an otherwise staionary scene C) they are reflexive. D) not all locations in scenes are equally intersting or informative. 35) The following about Recording Techniques that are safer for humans are true EXCEPT A) Magnetoencephalography is similar to the VEP technique and much less expensive. B) fMRIs involves placing your head in a very large magnet which allows comparing brain at times when a stimulus is presented against times when it is not by checking the blood-oxygen level. Greater activity requires more replenishing of oxygen. this technique has been used to map out the visual areas of the brain. C) Positron Emission Tomography (PET) relies on blood flow to highlight activity within the brain. Person must ingest or be injeted with radioactive glucose and the most active parts of the brain should preferentially take up radioactive substance and give off most radioactivity D) VEPs record electical activity of lots (perhaps thousands) of cells firing in the brain. The only way to isolate the activity of one cell is through Signaling Averaging.

Explanation / Answer

1. option A) We don't see our retinal blood vessels because they do not change and our eyes ignore them

2. option A) It encompasses a multitude of other disciplines like ophthalmology, neuroscience, computer vision, perception psychology etc.

3.

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