PSYC 3466 Lecture Notes - Lecture 6: Stimulus Modality, Mental Rotation, Visual Cortex
15 May 2019
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Bottom-up processing: we know that there are many different modalities, or channels, or sensory information. Top-down: when you expect to see something, your brain will see it. Blind people: mental imagery is real and seems to be an important part of mental computation. However, results from sensory substitution with the congenitally blind suggest that not all images are necessarily visual. Aphantasia: how it feels to be blind in your mind. Our perception/conception of what is out there in the world is not a veridical copy of reality, but built. In one sense, perception is built from the ground up, out of low components, each of which evolved to detect and compute speci c types of environmental information (bottom-up processing) The brain has expectations about what it will see, and these expectations constrain what it will perceive. Tuesday, may 14, 2019 when it"s confronted with information from its environment (top-down processing) Presumably, this strategy involves something other than imagery.
