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Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Related Experiment Video

Updated: Feb 5, 2026

Calcium Imaging of Cortical Neurons using Fura-2 AM
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Layer 2/3 Pyramidal Neurons Control the Gain of Cortical Output.

Michael Quiquempoix1, Sophie L Fayad1, Katia Boutourlinsky1

  • 1Sorbonne Université, CNRS, INSERM, Neurosciences Paris Seine - Institut de Biologie Paris Seine (NPS-IBPS), 75005 Paris, France.

Cell Reports
|September 13, 2018
PubMed
Summary
This summary is machine-generated.

Layer 2/3 pyramidal neurons significantly amplify sensory responses in deep-layer neurons. This amplification scales with stimulus velocity, suggesting a key role in gain control for somatosensory processing.

Keywords:
barrel cortexcortical connectivitygain controlsensory processingsomatosensorywhiskers

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Area of Science:

  • Neuroscience
  • Sensory Processing
  • Cortical Circuits

Background:

  • Traditional models posit serial sensory processing from layer 4 (L4) to L2/3 and then L5.
  • Recent findings suggest direct thalamic input to L5, questioning the role of L2/3 neurons.

Purpose of the Study:

  • To investigate the role of layer 2/3 (L2/3) pyramidal neurons in sensory processing within the somatosensory cortex.
  • To determine if L2/3 neurons influence the sensory responses of L5 neurons.

Main Methods:

  • Utilized cell type-specific and reversible optogenetic manipulations.
  • Experiments were conducted in both anesthetized and awake mice.
  • Focused on the somatosensory cortex.

Main Results:

  • L2/3 pyramidal neurons were found to significantly amplify sensory-evoked responses in L5 neurons.
  • The observed amplification effect demonstrated a scaling relationship with the velocity of the sensory stimulus.

Conclusions:

  • L2/3 pyramidal neurons play a crucial role in amplifying sensory information transmitted to L5 neurons.
  • These findings suggest that L2/3 neurons implement a gain control mechanism for deep-layer cortical neurons.