Question

question 8
3 pts
watch this video to learn more about a transverse section through the brain that depicts the visual pathway from the eye to the occipital cortex. the first half of the pathway is the projection from the rgcs through the optic nerve to the lateral geniculate nucleus in the thalamus on either side. this first fiber in the pathway synapses on a thalamic cell that then projects to the visual cortex in the occipital lobe where \seeing,\ or visual perception, takes place. this video gives an abbreviated overview of the visual system by concentrating on the pathway from the eyes to the occipital lobe. specialized cells in the retina called ganglion cells convert the light rays into _.
bipolar signals
chemical signals
electrical signals
photoreceptor signals
question 9
3 pts
watch this video to learn more about how the brain perceives 3 - d motion. similar to how retinal disparity offers 3 - d moviegoers a way to extract 3 - d information from the two - dimensional visual field projected onto the retina, the brain can extract information about movement in space by comparing what the two eyes see. if movement of a visual stimulus is leftward in one eye and rightward in the opposite eye, the brain interprets this as movement toward (or away) from the face along the midline. which eye is visualizing leftward stimulus?
left eye
right eye
both eyes
neither eye

Explanation:

• Question 8: Ganglion cells in the retina convert light rays into electrical signals. Bipolar cells are part of the retinal circuitry but not the direct conversion from light to signal type here. Chemical signals are involved in synaptic transmission but not the initial conversion. Photoreceptor signals are related to rods and cones (photoreceptors) which first detect light, and then ganglion cells convert that input (ultimately from photoreceptors) into electrical signals for transmission via the optic nerve.
• Question 9: When a visual stimulus is leftward in one eye and rightward in the opposite eye, the brain interprets movement along the midline. If we consider the normal visual field mapping (objects to the left of the midline project more to the right eye's temporal retina and left eye's nasal retina, but in terms of the described motion perception - when a stimulus is moving leftward in an eye, it's the left eye. Because if an object is moving towards the left side (from the viewer's perspective), in the left eye, the image on the retina would shift leftward (as the object moves left, its image on the left - eye retina moves left relative to the retina's orientation).

Answer:

• Question 8: electrical signals
• Question 9: left eye