Study Guide 2

Study Guide 2 - Study Guide #2 1) What is bottom-up versus...

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Study Guide #2 1) What is bottom-up versus top-down processing? Be prepared to give examples. Bottom-up processing is the information that comes directly from sensory information and top-down processing is how our brain changes those perceptions through past experience, expectations, etc… An example that could be used would be perspective drawing. 2) Be prepared to explain what happens with dyslexics – pertaining to the magnocellular versus parvocellular layers. Dyslexics have malfunctions in their magnocellular layer, which controls for the tracking of objects with the eyes. This makes it so that they have a hard time making their eye follow what their reading in the right timing to how they are verbally reading the words in their head, which jumbles up all the words they are trying to read. 3) Know all about 3-dimensional perception. Be prepared to describe in detail (1) binocular disparity, and how stereopsis works (2) the eye’s muscular cues (3) cross versus uncrossed disparity (I usually ask people to draw the horopter, and what is hitting the retina). Binocular Disparity – seeing the same object from slightly different angles in each eye and these two images are then processed and what overlaps is then perceived as a 3d image. Stereopsis – the perception of depth that results form the information provided by binocular disparity. The binocular disparity is just the disparity between the two images, the stereopsis is the resulting perception of depth that is taken from that disparity. Convergence – the degree of the angle to which the eyes have to converge so that each eye has the fovea focused on the object. The muscles of the eye relay this angular information to the brain to give information on how far away the object is. Horopter – where the object falls relative to the fovea, which is occupied by a given fixation point (Horopter?) Uncrossed Disparity – image falls on the inside of both retinas (farther) Cross Disparity – image falls on the outside of both retinas (closer) 4) Is 3d perception bottom-up or top-down processing? Why? Top-down, because the bottom-up is just the information coming directly from our retinas, which represents to different pictures of the same environment taken from two different angles. Top-down processing then takes what overlaps in the images and, depending on the degree of disparity between the different parts of the two overlapped images, creates a 3d image out of it with different parts having different levels of depth relative to each other 5) I’ll probably ask you what types of cells in the thalamus send 3d information. Don’t be caught off guard. The fovea is the part of the eye that sends 3d information. This information is then sent to the parvocellular layers of the lateral geniculate cortex, which then sends the information to the striate cortex, where the info from both eyes is processes and whatever overlaps is made into a 3d image depending on the disparity between the different objects
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This note was uploaded on 04/17/2008 for the course PSC 3090 taught by Professor Strongin during the Fall '05 term at UC Davis.

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Study Guide 2 - Study Guide #2 1) What is bottom-up versus...

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