PSY270H1 Lecture Notes - Lecture 6: Somatosensory System, Nocebo, Retina
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When you look at a screen, the same light photons are hitting your eyes and everybody else"s. Your experiences don"t physically affect/change the photons of light that are coming at you (the interpretation/perception might be different but the actual information coming from the bottom- up is the same). Top-down processing refers to using memory, knowledge, schemas, past experiences, your life experiences and personalities are used to give meaning to what you are perceiving. Bottom-up processes and top-down processes come together to form your overall life experience. It is the top-down processing that makes each person"s experience unique. How do we know that this object is a chair and how do we know that two objects are both chairs even though they have subtle differences? recall that we know that neuron can either be on or off. Researchers wanted to use this aspect of neurons to figure out how neurons represent components of an object.
