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Related Concept Videos

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.
Vision01:24

Vision

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.
Parallel Processing01:20

Parallel Processing

The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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...
Action Potential01:14

Action Potential

Neurons communicate by firing action potentials—the electrochemical signal that is propagated along the axon. The signal results in the release of neurotransmitters at axon terminals, thereby transmitting information to the nervous system. An action potential is a specific "all-or-none" change in membrane potential that results in a rapid spike in voltage.
Membrane potential in neurons
Neurons typically have a resting membrane potential of about -70 millivolts (mV). When they receive...
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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Related Experiment Video

Updated: May 27, 2026

In Vivo Visualization of Spontaneous Activity in Neonatal Mouse Sensory Cortex at a Single-Neuron Resolution
06:18

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The influence of spontaneous activity on stimulus processing in primary visual cortex.

M L Schölvinck1, K J Friston, G Rees

  • 1Institute of Cognitive Neuroscience, University College London, 17 Queen Square, London WC1N 3AR, UK. marieke.scholvinck@esi-frankfurt.de

Neuroimage
|November 8, 2011
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Summary

Spontaneous brain activity in the visual cortex minimally impacts neuronal responses to stimuli. However, higher spontaneous activity improves behavioral detection of visual stimuli at the perceptual threshold.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Neuroscience

Background:

  • Spontaneous brain activity is well-studied in resting states, but its influence on local sensory processing remains unclear.
  • Understanding spontaneous activity's role is crucial for comprehending brain function and sensory perception.

Purpose of the Study:

  • To investigate the effect of spontaneous activity in the primary visual cortex on neuronal and behavioral responses to visual stimuli.
  • To determine if spontaneous fluctuations interact with stimulus-evoked responses in the visual cortex.

Main Methods:

  • Utilized functional magnetic resonance imaging (fMRI) to measure brain activity.
  • Examined neuronal and behavioral responses to simple visual stimuli in relation to spontaneous activity levels.

Main Results:

  • Stimulus-evoked neuronal responses showed minimal changes and combined linearly with spontaneous fluctuations.
  • Behavioral data revealed interactions: higher spontaneous activity correlated with enhanced stimulus detection at the perceptual threshold.

Conclusions:

  • Spontaneous activity in the primary visual cortex has a limited impact on neuronal stimulus processing, acting in a largely linear manner.
  • Despite minimal neuronal interaction, spontaneous activity significantly influences behavior, enhancing stimulus detection at threshold.
  • These findings suggest a fundamental role for spontaneous brain activity in sensory stimulus processing across different brain regions.