PSY 200 1st Edition Lecture 5Current LectureDistributed Coding- color perception -The retina has three types of cones- each type has a different pigment=absorbs light around a particular wavelength.-We can measure how much light of different wavelengths a cone absorbs, to determine that cones preferred wavelength.Physics-White light (the light from the sun) contains many wavelengths. 3 Types of Cones-S cones- blue-M cones- green-L cones- red-Each cell has all or none firing-Distributed Coding- a type of coding in which the information that constitutes a concept is spread amongst a number of constituent representations. Lateral Inhibition-Information from rods and cones is integrated in the ganglion cell of optic nerves. -Lateral inhibition- when stimulated, a neuron will inhibit the activity of neighboring cells.-Information from rods and cones is integrated in the ganglion cell of optic nerves. -Lateral inhibition results in enhancement of the edges of objects. -Visual system emphasizes change in environment.-Receptive fields become more complex.-Receptive field in ganglion cell of retina- point of light.-Receptive field in occipital lobe- orientation of edge.Different Approaches to Visual Object Perception-Feature integration theory- Bottom-up -Recognition by Components Theory- Bottom- up-Gestalt Approach- Top-down Feature Integration TheoryThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-Object perception occurs in a sequence of stages in which features are first analyzed and then combines to result in perception of an object.-Features are color, motion, orientation, shape, etc. Feature Detectors-By examining how we perceive different visual features, we can see whether it broadly fits with feature integration theory. -Feature are perceived at a preattentive stage. Motion-Area MT (Medical Temporal) and respond primarily to motion.-A given type of cell is specialized to see a given type of motion (and if it fires that is the perception)-V1- most cells that are tuned to horizontal and vertical are excited… ones that are tuned to 45 degrees are not excited.-MT- a sub-population of cells tuned to 45 degrees are excited.The Binding Problem-Neural evidence supports Feature Integration Theory.-Specialized areas for different properties (color, motion, etc.)-Treisman’s Feature Integration TheoryFIT: The Details-Models form two kind of “maps.”-Feature maps (color, orientation, etc.)- A master map of locations. -Within a feature map there is parallel processing- a “preattentive stage.”-Feature from maps are bound by focal attention to a location in the mast map- “attentive