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Related Concept Videos

Somatosensory, Motor, and Association Cortex01:23

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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 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 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
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Cerebrum: Anatomical Overview II01:11

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Each cerebral hemisphere can be divided into three main regions. The outermost region, the cerebral cortex, is a thin layer (2 to 4 millimeters thick) made up of gray matter, consisting of neuron cell bodies, dendrites, glial cells, and blood vessels. The middle region, or white matter, is primarily composed of myelinated nerve fibers organized into three types of large tracts: association fibers, commissures, and projection fibers. Association fibers connect different areas within the same...
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Cerebrum: Anatomical Overview I01:26

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The main and largest component of the human brain is the cerebrum. The cerebrum consists of two main parts: the cerebral cortex, an outer layer with wrinkles or folds known as gyri and shallow grooves called sulci, and a deeper region beneath it. The cerebrum divides into two distinct hemispheres and contains five different lobes: the frontal, parietal, temporal, occipital, and insula. The central sulcus separates the frontal and parietal lobes and two functionally important gyri — the...
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The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
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View-invariant representations in ancestral cortex.

Milan Becker1, Nimrod Leberstein1,2, Mark Shein-Idelson1,2

  • 1School of Neurobiology, Biochemistry, and Biophysics, Tel Aviv University, Tel Aviv, Israel.

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|November 26, 2025
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Summary
This summary is machine-generated.

The turtle cortex processes visual information with position-invariant computations, similar to mammals. This suggests ancestral cortices performed complex invariance tasks before local filtering evolved.

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Area of Science:

  • Neuroscience
  • Evolutionary Biology
  • Comparative Cognition

Background:

  • The evolution of the mammalian neocortex is crucial for understanding higher cognitive functions.
  • The function of the ancient, multilayered visual cortex in stem amniotes remains largely unknown.
  • Turtles possess a dorsal cortex considered a homolog to the mammalian neocortex.

Purpose of the Study:

  • To investigate the functional properties of the turtle dorsal cortex in response to visual stimuli.
  • To explore the evolutionary origins of visual processing computations, particularly invariance.
  • To challenge existing hierarchical models of sensory processing.

Main Methods:

  • Recording visually evoked responses in behaving turtles.
  • Utilizing a spatial oddball paradigm to present visual stimuli.
  • Employing eye tracking to monitor gaze shifts and stimulus presentation on the retina.

Main Results:

  • The turtle cortex exhibited tuning to deviant stimulus positions.
  • Adaptation to standard stimulus positions was observed.
  • Neural responses remained spatially selective despite gaze shifts, indicating retinal position invariance.

Conclusions:

  • The turtle cortex performs computations invariant to retinal position, a trait previously seen only in advanced mammalian cortices.
  • Invariance computations likely preceded local filtering computations in mammalian primary cortices.
  • Ancestral cortices may have possessed functions not previously recognized, challenging hierarchical models of sensory processing.