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Lecture 4

PSY-2012 Lecture Notes - Lecture 4: Neural Adaptation, Ath

Course Code
Timothy Kutta

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Test two notes:
Ch.4: sensation and perception
- Sensation: the detection of physical energy by our sense organs, which send that info to the
- Pereptio: the rai’s iterpretatio of ra sesory date
- Two sides of the coin
Requires using previous knowledge
Involves integrating information
Whe the ay e pereie a stiulus does’t ath reality, that’s a illusio
- Sensation:
Despite their differences, all our senses rely on a handful of principles
The external stimulus is converted by a sense receptor into neural activity via
Light and sound waves are converted to electrical signals
Activation is highest when stimulus is first detected, then sensory adaptation occurs
- So oe e sese…. ho do e pereie?
After being transduced, our brains organize sensory data into meaningful concepts
Our brains piece together
a. What’s i our sesory field
b. What was there a moment ago
c. What we remember from our past
- The multitasking brain
We attend to multiple senses at once, called parallel processing (how we perceive the
Bottom up vs. top-down processing
- Two types of processing
Bottom-up processing
Begins with automatic sensory detection and encoding of the stimuli into a
meaningful representation
Edge, detection, color, or movement
Top= organizing and interpreting
Bottom= detecting and encoding
Top-down processing
Begins with conscious organization and interpretation of the stimuli using our
beliefs and expectations
Goals and intentions: the manner in which attention is allocated also depends
on goals and expectations of the observer
- Perceptual hypotheses
Perceptual sets occur when our expectations influence perceptions
Result of top-down processing
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