lecture 2 Flashcards
Perception
The study of how the external world gets represented in our brain/mind so that we can understand and act upon what’s going on around us
agnosia
individuals are missing some kind of knowledge. Visual agnosia deficit of gaining knowledge through vision but vision itself is normal The eye receptors are functioning, they respond to light the damage is in the cortex but vision is always intact. can report basic visual information. a deficit in recognition despite normal vision
Deficits in Visual Processing
apperceptive agnosia
associative agnosia
separate steps to visual perception
- Input/sensation
- Basic visual components assembled
- Meaning is linked to visual input
Experience error
Approaches to Study Perception
- Computational approach
- Gestalt approach
- Perception/action approach
Computational approach
Gestalt approach
Perception/action approach
Bottom up and top down processing
Computational
Bottom-up (data driven)
We recognize patterns by analyzing sensory input step-by-step e.g. ision- light receptors- reaches back of brain- sent to front- put info together.. step by step, building it up together
Top-down (conceptually driven)
Perception is influenced by our prior knowledge, memories and experiences- e.g. Always sit with a friend in lecture, one day you are late save me a spot. walk in try to find friends. Using bottom up processing you pick one location, receive visual input and eventually recognise or not that person, if it is not friend go to different location. If you sit in the same spot you use that knowledge to go to the area where you usually sit. using previous knowledge to guide search
Template matching
Computational
Feature matching
computational
Biederman’s Recognition by Components
computational
View-based recognition
computational
bottom up
top down
Law of proximity
Gestalt
Law of similarity
gestalt
Law of common region
Gestalt
Role of experience
Gestalt
Perception/ action
