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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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Overview of Somatic Sensory Pathways01:29

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Somatic sensory or somatosensory pathways refer to the neural pathways that carry information related to touch, pressure, pain, temperature, and proprioception from the skin, muscles, tendons, and joints to the brain. These pathways involve several stages of processing and integration of sensory information.
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Major Somatic Sensory Pathways01:28

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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...
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Diencephalon: Thalamus and Information Relay01:27

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The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological...
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What is a Sensory System?01:31

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Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
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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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A transthalamic pathway crucial for perception.

C Mo, C McKinnon, S M Sherman

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    |April 10, 2023
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    Summary
    This summary is machine-generated.

    Transthalamic pathways are crucial for sensory perception, carrying vital information for decision-making. Inhibiting these pathways impaired texture discrimination, challenging purely brain-cortex-centric models of perception.

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    Area of Science:

    • Neuroscience
    • Sensory Processing
    • Perceptual Decision-Making

    Background:

    • Perception involves communication between cortical areas, including direct corticocortical and less-understood transthalamic pathways.
    • The role of transthalamic (cortico-thalamo-cortical) pathways in sensory processing remains largely unexplored.

    Approach:

    • Optogenetic inhibition of transthalamic pathway synapses in the higher order somatosensory thalamus of mice during a texture discrimination task.
    • Concurrent two-photon calcium imaging to monitor cellular activity in primary and secondary somatosensory cortices.

    Key Points:

    • Transthalamic pathway inhibition severely impaired texture discrimination performance, even with intact direct corticocortical pathways.
    • Inhibition disrupted texture selectivity in somatosensory cortex cells without reducing overall responsiveness.
    • Disruption of texture selectivity was more pronounced in secondary than primary somatosensory cortex, suggesting feedforward influence.

    Conclusions:

    • Transthalamic pathways are critical for transmitting task-relevant information to higher order cortex for perceptual decisions.
    • These findings challenge a purely corticocentric view of perception, highlighting the hierarchical role of transthalamic routes.