Everything in Modulation: Neuromodulators as Keys to Understanding Communication Dynamics
Charlotte L Barkan1, Elizabeth C Leininger2, Erik Zornik1
1Department of Biology, Reed College, Portland, OR 97202, USA.
Integrative and Comparative Biology
|May 26, 2021
Summary
Neuromodulators fine-tune animal communication by acting on sensory, decision-making, and motor systems. This research explores how these chemical signals enable flexible, context-dependent vocal behaviors in Xenopus frogs and other vertebrates.
Area of Science:
- Neuroscience
- Animal Behavior
- Bioacoustics
Background:
- Context-dependent communication signals are vital across species.
- Neuromodulators influence sensory processing, sensorimotor integration, and motor control.
- Understanding neuromodulatory roles is key to deciphering complex communication patterns.
Purpose of the Study:
- To investigate how neuromodulators enable context-dependent communication behaviors.
- To explore the mechanisms underlying flexible vocalizations in Xenopus frogs.
- To provide a comparative overview of neuromodulatory effects in vertebrate communication.
Main Methods:
- Focus on vocal circuit dynamics in Xenopus frogs.
- Analysis of neuromodulator actions at multiple control levels.
- Examination of complementary examples from diverse vertebrate communication systems.
Main Results:
- Neuromodulators act at various levels of neural control for communication.
- Distinct and dynamic responses to similar signals are modulated.
- Functional outcomes of neuromodulation depend on species and internal state.
Conclusions:
- Neuromodulators are crucial for flexible and context-specific communication.
- Multiple neuromodulators can target the same circuit, influencing behavior.
- Species-specific and internal organismal states shape neuromodulatory effects on communication.
Related Concept Videos
01:28Neuronal Communication
2.2K
Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
2.2K
01:29Excitatory and Inhibitory Effects of Neurotransmitters
11.7K
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
11.7K
01:26Neurochemical Transmission: Sites of Drug Action
3.0K
Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
3.0K
01:29Neuromuscular Junction And Blockade
4.0K
The site of chemical communication between a motor neuron and a muscle fiber is called the neuromuscular junction (NMJ). The end of the motor neuron at the NMJ divides into a cluster of synaptic end bulbs. The cytoplasm of these bulbs consists of synaptic vesicles enclosing acetylcholine molecules, the principal neurotransmitter released at the NMJ. The region opposite the synaptic bulb that ends in the muscle fiber is called the motor end plate, which has acetylcholine receptors. Within the...
4.0K
01:19The Neuromuscular Junction
15.4K
The nervous system consists of complex motor neuron circuits, including upper motor neurons originating from the cerebral cortex and lower motor neurons starting in the spinal cord, coordinating both voluntary and involuntary movements. Among these, somatic motor neurons activate skeletal muscles and are classified into alpha, beta, and gamma types. Alpha neurons are vital for voluntary movement coordination, while gamma neurons adjust muscle spindle sensitivity, and the function of beta...
15.4K
01:19The Role of Ion Channels in Neuronal Computation
3.4K
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
3.4K