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Related Concept Videos

Visual System01:26

Visual System

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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.
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Related Experiment Video

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Gaze in Action: Head-mounted Eye Tracking of Children's Dynamic Visual Attention During Naturalistic Behavior
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How You Use It Matters: Object Function Guides Attention During Visual Search in Scenes.

Monica S Castelhano1, Richelle L Witherspoon2

  • 1Department of Psychology, Queen's University monica.castelhano@queensu.ca.

Psychological Science
|March 30, 2016
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Knowledge of an object's function guides visual attention during search. Participants who learned object functions, but not those who learned features, searched faster, showing function guides where we look.

Keywords:
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Area of Science:

  • Cognitive psychology
  • Visual cognition
  • Neuroscience

Background:

  • Objects are frequently encountered in everyday scenes.
  • Understanding how we locate objects is crucial for visual cognition.

Purpose of the Study:

  • To investigate if an object's function influences attentional guidance during visual search.
  • To explore the role of functional knowledge in scene perception.

Main Methods:

  • Experiment 1: Participants learned either the function or features of novel objects and then performed a visual search task.
  • Experiment 2: Participants searched for objects in locations that were either functionally congruent or incongruent with the object's purpose.

Main Results:

  • The function group showed faster search for studied objects compared to novel objects; the feature group did not.
  • Search for studied objects was facilitated in functionally congruent locations and hindered in incongruent locations.

Conclusions:

  • Knowledge of object function actively guides attention during visual search in complex scenes.
  • Findings support theories of visual cognition and have implications for understanding attention and perception.