Online Lecture 6 - Sensation & Perception

Online Lecture 6 - Sensation & Perception - Sensation &...

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1 Sensation and Perception How can you miss a gorilla? Josh Wede Psych 100 How do we construct our representations of the external world? To represent the world, we must detect physical energy (stimulus) from the environment and convert it into neural signals, a process called sensation . When we select, organize, and interpret our sensations, the process is called perception . Processing Cognition requires two types of processing Bottom-up processing Top-down processing Bottom-up Processing – Begin with sensory information – Use existing physical evidence – Laying the foundation Top-down Processing – Begin with knowledge, expectations – Navigate to the sensory, physical data – Looking at the big picture first Top-down and bottom-up
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2 Top-down and bottom-up Exploring the Senses 1. What stimuli cross our threshold for conscious awareness? 2. Could we be influenced by stimuli too weak (subliminal) to be perceived? 3. Why are we unaware of unchanging stimuli, like a band-aid on our skin? Psychophysics • Relate magnitude of the physical stimulus to the psychological response • What is the minimum amount of stimulus intensity required for detection/perception? • How can I reliably estimate that amount ?
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This note was uploaded on 09/23/2010 for the course IST 220 at Penn State.

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Online Lecture 6 - Sensation & Perception - Sensation &...

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