Rods are photoreceptors that are especially sensitive to dim light and are more

Rods are photoreceptors that are especially sensitive

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Rods- are photoreceptors that are especially sensitive to dim light and are more common closer to the retina (outer edge). Rods play a special role in peripheral vision. Rods don’t give info on color which is why you can’t see much color in the peripheral. Cones- are specialized to produce color and function better under bright light, and produce more sharp images. Optic disk/nerve- blood vessels serving the eye and axons that leave the retina that is specialized in creating sharp images Optic chiasm track- where the optic nerve cross over Fovea (area of the retina)- processes detailed vision Thalamus- acts as the target for most axons forming the optic tracts and is known as the relay station. Midurla- (Primary visual cortex (area in the occipital lobe)) - receives visual input from the thalamus and performs initial analysis of input. It responds to object shape, location, and movement 4. Know the role of different brain regions in the processing of visual stimuli. Optic tracts-nerve pathways travel from the optic chiasm to the thalamus, hypothalamus, and midbrain. About 90% of the axons in the optic tract synapse in the thalamus. Thalamus- sends information about vision to the amygdala and to the primary visual cortex in the occipital lobe Amygdala- uses visual information to make quick emotional judgements, especially about potentially harmful stimuli Hypothalamus- remaining optic track connects input provides info about the light needed to regulate sleep-wake cycles
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Superior colliculi of the midbrain- manages a number of visually guided reflexes, such as changing the size of the pupil in response to light conditions. Primary visual cortex (occipital lobe) - begins the processing of visual input and responds to object shape, location, movement, and color Parietal pathway- helps us process movement in the visual environment Temporal pathway- responds to shape and color and contributes to our ability to recognize objects and faces 5. Understand how the trichromacy theory and the opponent process theory differ. The trichomacy theory provides a helpful framework for the functioning of the 3 types of cones in the retina. However, as we move from the retina to higher levels of visual analysis in the thalamus and cerebral cortex, the opponent process theory seems to fit observed phenomena neatly. Both theories help us understand color vision but at different levels of the visual system. Trichomacy theory- experience of color comes from interaction between many combinations between cones that would function all at once. It is a theory of color vison based on the existence of different types of cones for the detection of short (blue), medium (green), and long (red) wavelengths. It does a good job at explaining color deficiency but it is less successful in accounting for other color vision phenomena, like color afterimages.
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