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Updated: Aug 9, 2026

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Creating Objects and Object Categories for Studying Perception and Perceptual Learning
Published on: November 2, 2012
Visual perception and phenomenal consciousness
Behavioural Brain Research
|November 1, 1995
Summary
Consciousness may be exclusive to self-distinguishing organisms. Investigating visual processing and blindsight in monkeys reveals distinct stages of phenomenal and accessible consciousness, crucial for thought and planning.
Area of Science:
- Neuroscience
- Cognitive Science
- Philosophy of Mind
Background:
- The nature and basis of consciousness remain debated.
- Distinguishing information processing from conscious representation is key.
- Understanding consciousness requires addressing who has it, its neural basis, and its function.
Purpose of the Study:
- To explore the criteria for consciousness in organisms.
- To identify the neuronal underpinnings of conscious representation.
- To elucidate the functional role of consciousness.
Main Methods:
- Analysis of visual processing stages and functional losses after lesions.
- Utilizing blindsight as a model for studying phenomenal vision.
- Employing animal models (monkeys) with specific cortical removals.
Main Results:
- Proposed consciousness is linked to self-non-self discrimination and modifiable behavior.
- Differentiated reflexive, phenomenal, and consciously accessible visual processing stages.
- Demonstrated that striate cortex removal in monkeys mimics blindsight, impacting phenomenal vision.
Conclusions:
- Phenomenal and consciously accessible vision are distinct aspects of consciousness.
- Loss of phenomenal vision may lead to loss of conscious accessibility.
- Consciousness facilitates retrieval and manipulation of information for thinking and planning.
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Visual System
Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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Gestalt Principles of Perception
Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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Parallel Processing
The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...

