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Full Text
Full Text

... final magnitude of illusions, it also plays a key role in providing an orientation signal for the application of computation by the perceptual system (Figure 2A and 2B). There are other theories that have been formulated based on other perceptual processes to explain some illusions (28, 32-36) for m ...
Summary - VU Research Portal
Summary - VU Research Portal

... objects in natural scenes. We hypothesized that the brain can take advantage from the extensive visual experience we accumulate throughout our life with a wide variety of objects. We tested the idea that perceptual grouping for familiar stimuli such as animals and vehicles may benefit from selectivi ...
attention
attention

... * Reading involves saccades and fixations * Saccades are rapid movements of the eye * Without them, the retina would “saturate” and you wouldn’t see anything * Fixations are the stops in that movement ...
Chapter 5 - Novell Open Enterprise Server 2
Chapter 5 - Novell Open Enterprise Server 2

... (2) The smaller, unmyelinated C fibers transmit the longerlasting throbbing, burning pain of injury (3) Most C fibers produce substance P, a pain enhancer that stimulates free nerve endings at the injury site and increases the pain messages within the spinal cord. (4) Most messages cross to the othe ...
PSYCHOLOGY (8th Edition) David Myers
PSYCHOLOGY (8th Edition) David Myers

... perceived to be moving more slowly that smaller objects. The brain will also perceive continuous movement in a series of slightly varying images. The illusion of movement is also created using the phi phenomenon – when two adjacent stationary lights blink on and off in quick succession ...
Depth perception - Bremerton School District
Depth perception - Bremerton School District

... perceived to be moving more slowly that smaller objects. The brain will also perceive continuous movement in a series of slightly varying images. The illusion of movement is also created using the phi phenomenon – when two adjacent stationary lights blink on and off in quick succession ...
Chapter 3
Chapter 3

... • Left=3 groups of dots; Right=vertical columns of dots not horizontal rows ...
Visual Perception
Visual Perception

... The Maximum-likelihood Principle The Gestalt principles emphasize fact that we tend to perceive objects in the world according to rules that we have learned from observing the regularities of our environment. These perceptual grouping principles can all be united under a single general rule: the pri ...
3. Explain the basic thrust of signal-detection theory. 5. Discuss the
3. Explain the basic thrust of signal-detection theory. 5. Discuss the

... The processing of visual information begins within the receiving area of a retinal cell called the field. Stimulation of the receptive field of a cell causes signals to be sent inward towards the brain and sideways, or , to nearby cells, thus allowing them to interact with one another. The most basi ...
SENSATION AND PERCEPTION
SENSATION AND PERCEPTION

... • Two-Dimensional Location – uses an equation that takes information about where an image strikes the retina and adjusts it based on information about movement of your eyes and head – Visual dominance – bias toward using visual information when it conflicts with information from other senses ...
Neural Basis of the Ventriloquist
Neural Basis of the Ventriloquist

... Lateralization may be due to attentional orientation to perceived sound location No differential BOLD response in attentional areas (anterior cingulate, posterior parietal cortex) between illusion/noillusion trials Other behavioral results suggest visual attention has little influence on illusion ...
Document
Document

... combination of sensation and decision-making processes – Based on each individual’s sensitivity and response criterion – Example: holiday weekend on the interstate ...
Sensation and Perception
Sensation and Perception

... As objects in our plane of vision that are below the horizon get closer to the horizon (and, if above the horizon, they get farther from the horizon), they are perceived as more distant ...
PSy420: Sensation and Perception (Dr. Hajnal) March 22, 2010
PSy420: Sensation and Perception (Dr. Hajnal) March 22, 2010

... The diagram below illustrates the _______ depth cue. ...
Document
Document

... by learning, rather than innate factors Perceptual set – Readiness to detect a particular stimulus in a given context ...
Retina Rods retina receptors that detect black, white, and gray
Retina Rods retina receptors that detect black, white, and gray

... Interposition-something that blocks another item is perceived as closer Linear perspective-parallel lines seem to converge with distance Relative motion-objects that are stable appear to move as we move (in a car) ...
Ch 4 Power Point
Ch 4 Power Point

... • Similarity: we group objects of similar size or shape • Simplicity: we group elements together to form a simple figure • Continuity: we follow objects in the direction we are led ...
The Visual System
The Visual System

... • When an observer fixates on a visual object the image of this object is positioned on corresponding regions of the two retinae. • Human eyes are horizontally separated by about 5075 mm (between pupils). Thus, each eye has a slightly different view of the world. Objects more near or far than the fi ...
Percept
Percept

... Top-Down Processing • Bottom-up processing – Analysis that emphasizes characteristics of the stimulus, rather than internal concepts (stimulus-driven processing). • Top-down processing – Emphasizes perceiver's expectations, memories, and other cognitive factors (conceptually-driven processing). ...
MIND: The Cognitive Side of Mind and Brain
MIND: The Cognitive Side of Mind and Brain

... assess aspects of perception, attention, and memory.  Models of mental structures and processes of human perception, attention, memory, etc. based on data obtained from solid experimental procedures ...
Sensation and Perception
Sensation and Perception

... continuity--perceive continuous patterns closure--fill in gaps connectedness--spots, lines, and areas are seen as unit when connected simplicity--organize elements in simplest way ...
Chapter
Chapter

... Top-Down Processing • Bottom-up processing – Analysis that emphasizes characteristics of the stimulus, rather than internal concepts (stimulus-driven processing). • Top-down processing – Emphasizes perceiver's expectations, memories, and other cognitive factors (conceptually-driven processing). ...
Sensation and Perception
Sensation and Perception

... • Protecting the surface of the eye • Transmitting vibrations received by the eardrum to the hammer, anvil, and stirrup • Transforming vibrations into neural signals • Coordinating impulses from the rods and cones in the retina • Sending messages to the brain about orientation of the head and body ...
Chapter 4 Notes
Chapter 4 Notes

... certain simple features, such as angles and lines. • What are motion aftereffects? The waterfall illusion is one example • Do feature detectors offer a complete account for perception? ...
Chapter 4 Sensation and Perception
Chapter 4 Sensation and Perception

... Perception: Some Key Terms • Size Constancy: Perceived size of an object remains the same, DESPITE changes in its retinal image • Native Perception: A perceptual experience based on innate processes • Empirical Perception: A perception based on prior experience • Shape Constancy: The perceived shape ...
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Optical illusion



An optical illusion (also called a visual illusion) is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a perception that does not tally with a physical measurement of the stimulus source. There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological illusions that are the effects of excessive stimulation of a specific type (brightness, colour, size, position, tilt, movement), and cognitive illusions, the result of unconscious inferences. Pathological visual illusions arise from a pathological exaggeration in physiological visual perception mechanisms causing the aforementioned types of illusions.Optical illusions are often classified into categories including the physical and the cognitive or perceptual, and contrasted with optical hallucinations.
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