Pattern Recognition Flashcards
What is Agnosia?
Impairment of object recognition ability
What is the function of the Ventral pathway?
Occipital –> temporal
- Processes information about object appearance and identity
- Important for object perception
What is the function of the Dorsal pathway?
Occipital –> parietal
- Processes spatial information about objects
- Important for guiding action
What are the two cortical pathways?
Ventral and Dorsal
What is optic ataxia?
- Intact object recognition
- Inability to use visual information to guide action
- Associated with lesions in the dorsal pathway
What are the Gestalt principles?
- Similarity
- Closure
- Good continuation
- Proximity
What is template-matching?
We tend to recognize different stimuli as the same object (e.g., letter “A”) irrespective of superficial variations
What is feature analysis?
A visual pattern is perceived as a combination of elemental features
What happens when a pattern is present without eye movements?
whole features tend to dissapear simultaneously
What is recognition-by-component theory?
- An object is first segmented into a set of basic sub-objects (called geons), and then recognised as a pattern composed of geons
What is the different between the top-down vs bottom-up approach?
Bottom up = partial pattern/word and eventually decifer the correct word
Top down = visual of object, can decifer the word/name of object
What is the word-superiority effect?
- Superior recognition of letters in a word context than alone
- Indicates top-down influence on pattern recognition
What is the phoneme-restoration effect?
a letter is replaced by a sound in a sentence
- most people cannot hear the sound and replace it in processing with the correct letter
