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Related Concept Videos

Cholinergic Antagonists: Therapeutic Uses01:26

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Antimuscarinic drugs have various therapeutic applications by inhibiting parasympathetic stimulation in different systems. Here are the key therapeutic uses of antimuscarinics:    
Respiratory Tract: Ipratropium, aclidinium, and tiotropium treat asthma, chronic bronchitis, and chronic obstructive pulmonary disease (COPD). They protect against bronchoconstriction caused by irritants like cigarette smoke, sulfur dioxide, and ozone. They also help reduce nasopharyngeal...
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Cholinergic Neurons: Neurotransmission01:23

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Cholinergic neurotransmission involves the synthesis and the release of acetylcholine (ACh) in order to transmit nerve impulses across the synapse. The process begins with the synthesis of acetyl CoA, a precursor for ACh, from ATP, acetate, and coenzyme A in the mitochondria. Choline, another vital precursor, is transported inside the neuron through choline transporters, including high-affinity choline transporter CHT1, low-affinity choline transporter CTL1, and lower-affinity choline...
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The pharmacological actions of acetylcholine are elicited via its binding to two families of cholinergic receptors or cholinoceptors, namely, muscarinic and nicotinic receptors. Muscarinic receptors are G protein-coupled receptors and have five subtypes, M1–M5. All mAChR subtypes are activated by acetylcholine and blocked by the antagonist, atropine. 
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Cholinergic Receptors: Nicotinic01:15

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Nicotinic receptors are ligand-gated ion channels that are activated by acetylcholine and nicotine. Upon activation, they cause a rapid increase in the permeability of cells to K+, Na+, and Ca2+, followed by depolarization and excitation. They are in the autonomic ganglia, skeletal neuromuscular junction, CNS, and adrenal medulla.
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Cholinergic Antagonists: Pharmacokinetics01:24

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Cholinergic antagonists—such as antimuscarinics—are available in oral, topical, ocular, parenteral, and inhalational formulations. Most antimuscarinics are oral formulations,  while scopolamine is available as a topical patch, and ipratropium and tiotropium are available as inhalation aerosols or powders. Atropine, tropicamide, and cyclopentolate are topically instilled in the eye. Most antimuscarinics are lipid-soluble and readily absorbed from the gastrointestinal tract and...
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Normal Distribution01:11

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The normal, a continuous distribution, is the most important of all the distributions. Its graph is a bell-shaped symmetrical curve, which is observed in almost all disciplines. Some of these include psychology, business, economics, the sciences, nursing, and, of course, mathematics. Some instructors may use the normal distribution to help determine students’ grades. Most IQ scores are normally distributed. Often real-estate prices fit a normal distribution. The normal distribution is...
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Related Experiment Video

Updated: Feb 12, 2026

Slicing the Embryonic Chicken Auditory Brainstem to Evaluate Tonotopic Gradients and Microcircuits
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Normalization and the Cholinergic Microcircuit: A Unified Basis for Attention.

Taylor W Schmitz1, John Duncan2

  • 1Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, 3801 rue University, Montreal, QC, H3A 2B4, Canada.

Trends in Cognitive Sciences
|March 27, 2018
PubMed
Summary

Directed attention modifies neural activity through normalization, a computation potentially driven by basal forebrain cholinergic signals. This suggests a biological mechanism for attention

Keywords:
acetylcholine/cholinergicattentionbasal forebraincortical circuitdivisive normalizationnoise correlation

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Computational Neuroscience

Background:

  • Attention significantly impacts neural activity, affecting firing rate, rate variability, and shared variability.
  • Normalization is a canonical computation explaining these attention-driven changes across hierarchical brain systems.

Purpose of the Study:

  • To investigate the role of basal forebrain cholinergic modulation in attention-related neural activity changes.
  • To explore if cholinergic signals mimic the effects of directed attention on population neural activity.

Main Methods:

  • Combined electrophysiological data from rodents and nonhuman primates.
  • Analyzed population neural activity properties including firing rate, rate variability, and shared variability.
  • Investigated the relationship between cortical cholinergic modulation and attention-related neural coding.

Main Results:

  • Cortical cholinergic modulation from the basal forebrain closely mimics the effects of directed attention on neural activity.
  • Normalization, a key computation, is modulated by cholinergic signals in the cortical microcircuit.
  • These findings were consistent across different species (rodents and nonhuman primates).

Conclusions:

  • Cholinergic modulation provides a potential biological basis for attention's effects on neural population coding.
  • The basal forebrain's cholinergic system may orchestrate rapid and flexible neural changes required for directed attention.
  • Normalization serves as a unifying computational principle linking attention and cholinergic signaling in the brain.