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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:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Olfaction

The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
The olfactory receptors are embedded in the cilia of the...
Role of Hippocampus in Memory01:19

Role of Hippocampus in Memory

The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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 cortex.
Somatosensory, Motor, and Association Cortex01:23

Somatosensory, Motor, and Association Cortex

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 the...
Cerebral Hemispheres01:05

Cerebral Hemispheres

The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...

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Related Experiment Video

Updated: May 15, 2026

Novel Object Recognition Test for the Investigation of Learning and Memory in Mice
08:52

Novel Object Recognition Test for the Investigation of Learning and Memory in Mice

Published on: August 30, 2017

Medial perirhinal cortex disambiguates confusable objects.

Sasa L Kivisaari1, Lorraine K Tyler, Andreas U Monsch

  • 1Memory Clinic, Department of Geriatrics, University Hospital Basel, University of Basel, Basel, CH, Switzerland.

Brain : a Journal of Neurology
|December 20, 2012
PubMed
Summary
This summary is machine-generated.

The medial perirhinal cortex is crucial for distinguishing visually similar objects, especially living things. Damage here impairs object disambiguation, supporting its role in semantic processing.

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Last Updated: May 15, 2026

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuroimaging

Background:

  • The brain's ability to disambiguate objects in cluttered visual scenes is vital for comprehension and action.
  • The precise role of anteromedial temporal lobe structures, particularly the perirhinal cortex, in object processing remains debated.
  • Previous research is limited by extensive brain damage in patients, hindering the identification of specific substructure contributions.

Purpose of the Study:

  • To investigate the distinct functional roles of perirhinal cortex subregions in object disambiguation.
  • To test competing models of perirhinal cortex function in differentiating perceptually and semantically confusable objects.
  • To determine the neuroanatomical basis of semantic impairments associated with anteromedial temporal lobe damage.

Main Methods:

  • Utilized a region of interest approach in Alzheimer's disease patients with varying anteromedial temporal lobe atrophy.
  • Acquired MRI scans to measure cortical thickness in medial and lateral perirhinal cortex, entorhinal cortex, and hippocampal volume.
  • Assessed naming performance on living (perceptually/semantically similar) versus non-living (distinct) things using a picture naming task.

Main Results:

  • Atrophy in the medial perirhinal cortex significantly predicted impaired naming of living relative to non-living things.
  • No significant effect was found for atrophy in the lateral perirhinal cortex, entorhinal cortex, or hippocampus.
  • These findings pinpoint the medial perirhinal cortex as essential for disambiguating perceptually and semantically confusable objects.

Conclusions:

  • The medial perirhinal cortex is critically necessary for disambiguating perceptually and semantically confusable objects.
  • Results support a hierarchical model of object processing, with the perirhinal cortex binding object properties for comprehension.
  • Damage to the medial perirhinal cortex underlies category-specific semantic impairments for living things observed in anteromedial temporal lobe damage.