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Related Concept Videos

Vision01:24

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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Motor and Sensory Areas of the Cortex01:14

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The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor...
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Visual System01:26

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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.
Once through the pupil, the light passes through the lens, a...
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Anatomy of the Eyeball01:20

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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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Somatosensory, Motor, and Association Cortex01:24

Somatosensory, Motor, and Association Cortex

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Association Areas of the Cortex01:21

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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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Perceptual and Category Processing of the Uncanny Valley Hypothesis' Dimension of Human Likeness: Some Methodological Issues
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Dynamic categorization rules alter representations in human visual cortex.

Margaret M Henderson1,2, John T Serences3,4, Nuttida Rungratsameetaweemana5,6

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, PA, USA. mmhender@cmu.edu.

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Visual cortex adapts to categorize shapes dynamically based on task rules. This context-dependent processing enhances shape discrimination and improves task performance.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Sensory regions traditionally viewed as separate from context-dependent processing.
  • Emerging view: sensory regions integrate task goals for efficient information relay.

Purpose of the Study:

  • Investigate if visual cortex representations adapt dynamically to decision rules.
  • Test the role of visual cortex in context-dependent categorization.

Main Methods:

  • Human participants performed visual categorization of novel shapes.
  • Functional magnetic resonance imaging (fMRI) used to analyze brain activity.
  • Multivariate analyses applied to retinotopically-defined visual areas.

Main Results:

  • Cortical shape representations became more distinct across decision boundaries context-dependently.
  • Maximal changes in discriminability occurred for stimuli near the decision boundary.
  • Modulations in visual cortex correlated with improved task performance.

Conclusions:

  • Visual cortex representations are adaptively modulated to support dynamic behavior.
  • Demonstrates integration of task goals within sensory processing areas.
  • Challenges traditional views of sensory region function.