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Questions and Answers
What is the correct pathway for visual information from the photoreceptors in the retina to the primary visual cortex?
How does shining light on the surround of an on-centre retinal ganglion cell affect its firing rate?
Michelson Contrast is defined as the ___________ in luminance between two surfaces.
Which brain imaging technique is best for measuring brain activity with high temporal and spatial precision?
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Which two depth cues contribute to the Ponzo Illusion?
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Which area of the human brain is primarily responsible for motion processing?
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What type of processing is likely to be disrupted by a traumatic brain injury localized to the Parietal lobe?
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Which of the following statements about saccades is correct?
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What is the correct pathway for visual information from the photoreceptors in the retina to the primary visual cortex?
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How does the response of an on-centre retinal ganglion cell change when light is shone on its centre and surround?
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Michelson Contrast is defined as what type of difference in luminance between two surfaces?
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Which technique is the most appropriate for measuring brain activity that is both temporally and spatially precise?
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The Ponzo Illusion primarily exploits which two depth cues?
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Motion is primarily processed in which area of the human brain?
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A traumatic brain injury localized to the Parietal lobe is likely to disrupt which type of processing?
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How does the Energy Model differ from the Reichardt Motion detector?
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Study Notes
Visual Pathway
- Visual information travels from the photoreceptors in the retina to the primary visual cortex (V1) through the Optic Nerve, then the Lateral Geniculate Nucleus (LGN).
- V1 is the primary visual cortex.
On-Centre Retinal Ganglion Cells
- On-centre retinal ganglion cells increase their firing rate when light is shone in their center.
- They decrease their firing rate when light is shone in their surround.
Michelson Contrast
- Michelson Contrast measures the relative difference in luminance between two surfaces.
Brain Imaging Techniques
- Single Cell Recording is best for measuring brain activity with both temporal and spatial precision.
Ponzo Illusion
- The Ponzo Illusion is due to the exploitation of Linear Perspective and Size Constancy.
Motion Processing
- Motion is processed in V5/MT in the human brain.
Dorsal Stream
- The Dorsal Stream (Parietal Lobe) is involved in Motion and spatial information processing.
Energy Model and Reichardt Motion Detector
- The Energy Model and Reichardt Motion Detector are both models of motion detection.
- The Energy Model uses quadrature pairs and the banks of spatial and temporal filters.
- The Reichardt Model incorporates a time delay, but does not use quadrature pairs.
Saccades
- Saccades are ballistic (they cannot be stopped once initiated), "jerky" eye movements.
- They are used to shift gaze across the visual scene.
Hand Movement Error
- Both visual and motor error can contribute to imprecision in hand movements.
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Description
Explore the intricacies of the visual pathway, including the role of the primary visual cortex and motion processing areas in the brain. This quiz covers concepts like retinal ganglion cells, the Ponzo illusion, and brain imaging techniques. Test your knowledge on how we perceive and interpret visual information.
