PS267 Lecture Notes - Lecture 9: Outline Of Object Recognition, Two-Streams Hypothesis, Occipital Lobe
Document Summary
Lecture 9 object recognition part 1: principles of object recognition, multiple pathways for visual perception, computational problems in object recognition, failures in object recognition, category specificity in agnosia, processing faces, mind reading. Principles of object recognition: sensation, perception, and recognition are different phenomena, we perceive objects as unified wholes, our perceptual capabilities are extremely flexible, perception and memory are tightly linked, to be able to recognize. Dorsal stream = where" pathway: aka occipito-parietal stream, location of objects. Ventral stream = what" pathway: aka occipito-temporal stream, v1 to inferior temporal cortex. Discovered due to experimentation w/ monkeys and where food source is. Or what container the food is in: receptive fields of neurons in parietal lobe are large and non-selective, and represent both foveal and peripheral information. Ideal for processing the location of a stimulus. Respond to anything anywhere in the visual field: receptive fields of neurons in the temporal lobe are large and selective, and always represent foveal information only.
