PSYC 256 Lecture Notes - Lecture 8: Zenon Pylyshyn, Epiphenomenon, Stimulus Modality

11 views7 pages
13 Jun 2018
Department
Course

For unlimited access to Class Notes, a Class+ subscription is required.

VISUAL IMAGERY
Definition of Imagery
Mental representation
o Of things not currently sensed by the sense organs
o OR of things never observed by our senses
o In any sensory modality
Imagery as Knowledge
Question is NOT about the experience of having a mental image
Question is what form does that representation take in the mind & brain
o Is it propositional (abstract) or pictoral (analog)?
Imagery is an epiphenomenon:
o A phenomenon that is not related to the function of the system
The sensation of seeing an image is real, but that doesn’t mean that the sensation
has anything to do with the actual cognitive task being performed
)mages are epiphenomenal -Zenon Pylyshyn
Reasoning with mental images involves the same form of representations and the
same processes as that of reasoning in general
However, the content or subject matter of thoughts experienced as images includes
information about how the things would look
Images, though real, are epiphenomenal and do not serve any useful function
Propositional Theory
Libet et al. 1983
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 7 pages and 3 million more documents.

Already have an account? Log in
o If you have electrodes, can detect the brain activity leading to motor
movement that occurs before participant subjectively decides to move
Although the intention to act precedes an action, there is neural activity associated
with action that precedes the intention
Therefore, conscious awareness is not necessarily functional
We do not store mental representations in form of images
o Storing image of every scene/object violates cognitive economy
Mental representations stored as propositions
Alternative Representations
Is knowledge of math same as knowing what an apple looks like?
All knowledge is the same
The apple here is analogous to a real apple
Anti-Propositional View
Images
o Preserve the structure of original information in quasi-direct manner
o Resemble what they stand for (analog code)
o Implication is that imagery is functionally-equivalent to perception
You use the knowledge the same way regardless if distal stimulus is
present
Functional-Equivalency (Kosslyn)
Images are functionally equivalent to percepts
Analogous to the physical percepts they represent
Therefore, images should obey the same rules as percepts
Functional Equivalency (Kosslyn, Ball, & Reiser 1978)
Memorize map
Later ask to scan image
Manipulate distance between items in scan
find more resources at oneclass.com
find more resources at oneclass.com
Unlock document

This preview shows pages 1-2 of the document.
Unlock all 7 pages and 3 million more documents.

Already have an account? Log in

Get access

Grade+
$10 USD/m
Billed $120 USD annually
Homework Help
Class Notes
Textbook Notes
40 Verified Answers
Study Guides
1 Booster Class
Class+
$8 USD/m
Billed $96 USD annually
Homework Help
Class Notes
Textbook Notes
30 Verified Answers
Study Guides
1 Booster Class