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Related Concept Videos

Association Areas of the Cortex01:21

Association Areas of the Cortex

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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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.
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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 cortex.
Visual System01:26

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...
Visual Agnosia01:12

Visual Agnosia

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 end"...
How Data are Classified: Numerical Data00:59

How Data are Classified: Numerical Data

Data that are countable or measurable in specific units are called numerical or quantitative data. Quantitative data are always numbers. Quantitative data are the result of counting or measuring the attributes of a population. Amount of money, pulse rate, weight, number of people living in a town, and number of students who opt for statistics are examples of quantitative data.
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Environmental Modulations of the Number of Midbrain Dopamine Neurons in Adult Mice
09:35

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Published on: January 20, 2015

A brain area for visual numerals.

Jennifer Shum1, Dora Hermes, Brett L Foster

  • 1Stanford Human Intracranial Cognitive Electrophysiology Program (SHICEP), Stanford University, Stanford, California 94305, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 19, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered a specific brain region in the human visual system that preferentially responds to numerals. This finding, using intracranial electrophysiological recordings, identifies an acquired category-specific response to learned visual symbols.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual System Research

Background:

  • The human visual system exhibits specialized processing for categories like faces, words, and scenes.
  • It remains unclear if a distinct visual area preferentially responds to numerals, the symbolic representation of numbers.
  • Previous functional magnetic resonance imaging (fMRI) studies have yielded negative findings regarding numeral specialization.

Purpose of the Study:

  • To investigate the existence of a preferential neural response to numerals within the human visual system.
  • To anatomically localize any identified preferential response.
  • To reconcile findings with previous negative results in fMRI studies.

Main Methods:

  • Utilized intracranial electrophysiological recordings for high-resolution neural activity measurement.
  • Presented participants with visually perceived numerals, morphologically similar stimuli (letters, false fonts), and semantically/phonologically similar stimuli (number words, non-number words).
  • Analyzed neural responses in the high-frequency broadband range (gamma band, 65-150 Hz).

Main Results:

  • Observed a significantly higher neural response in the high gamma frequency range to numerals compared to control stimuli.
  • Consistently localized this preferential response to the inferior temporal gyrus, anterior to the temporo-occipital incisure.
  • This identified region is proximate to fMRI signal-dropout zones, potentially explaining prior negative findings.

Conclusions:

  • The human visual system possesses an anatomically localized preferential response to numerals.
  • This finding demonstrates an acquired, category-specific visual response to culturally dependent symbols learned through education.
  • Provides a novel example of how experience shapes the specialized organization of the human visual cortex.