1. The Construction Of
Visual Reality
Hamed Abdi
PhD Student in Computational Cognitive Science
Institute for Cognitive & Brain Science (ICBS)
2. Framework
A Brief Review on Book
Illusions: What and Why
Vision as Construction
Perceptual Evolution
Interface Theory of Perception
Biological Examples
Hallucinations
3. A Brief Review on Book
Contents:
Part I: Conceptual Issues
A Network Model of Hallucinations
Part II: Hallucinatory Phenomena
Phantom Body, Phantom Self: A Phenomenology of “Body
Hallucinations”
Djinns
Part III: Research
Functional Neuroimaging of Hallucinations
Neurophysiological Research: EEG and MEG
Part IV: Treatment
7. Illusions: What and Why
Standard view More accurate perceptions are more fit
What you see is what you get
Struggle for survival:
Perception the more truly structure of the world
Constructive process to guide adaptive behavior
8. Vision as Construction
The Camera Theory Of Vision
BUT
Billions of neurons in visual cortex?!!!
Computational power is not necessary
to take a picture.
9. Vision as Construction
The visual system constructs our visual worlds because it must.
but why?
From Photon to Visual Cortex
From 2D to 3D
13. Perceptual Evolution
Truth and utility are distinct concepts
u :W O R
World Organism
Reality/Truth Utility
benthic fish
14. Perceptual Evolution
Mathematical Theory of Evolution
Evolutionary Game Theory
Natural Selection law:
True Perception Swift Extinction
Perceptual information does not come FREE !!!
15. Interface Theory of Perception
Windows Desktop Metaphor
Desktop Time-Space
Icons Objects
Hide the complexities of the truth
Adaptive Behavior
16. Interface Theory of Perception
Inexistence Drag to trashcan!!!
Conventionalism
Idealism
Symbolism
18. A New Theory of Illusions and Hallucinations
An illusion is a perception, experienced by
most people in a specific context, that is not
an adaptive guide to behavior.
• A hallucination is a perception experienced
by few people that occurs in the absence of
an appropriate context and that is not an
adaptive guide to behavior.
Correct Perception
Adaptive Behaviors GABAergic System