Related Experiment Video
Updated: May 17, 2026
07:17
Aversive Associative Learning and Memory Formation by Pairing Two Chemicals in Caenorhabditis elegans
Published on: June 23, 2022
Evolution of associative learning in chemical networks
Simon McGregor1, Vera Vasas, Phil Husbands
1Department of Informatics, University of Sussex, Falmer, Brighton, United Kingdom.
Plos Computational Biology
|November 8, 2012
Summary
Simple chemical networks can achieve associative learning, enabling organisms to adapt their behavior. This study reveals basic chemical mechanisms for learning, suggesting it can evolve across various cellular systems.
Area of Science:
- Biochemistry
- Systems Biology
- Evolutionary Biology
Background:
- Associative learning is crucial for survival and reproduction, allowing organisms to adapt behavior based on environmental cues.
- While neural mechanisms of associative learning are well-understood, cellular-level chemical mechanisms remain largely unexplored.
Purpose of the Study:
- To investigate the potential for associative learning within single-cell chemical networks.
- To identify and characterize simple, plausible chemical solutions for associative learning.
Main Methods:
- In silico evolution of chemical reaction networks.
- Bayesian analysis of chemical concentration dynamics to identify 'memory traces'.
Main Results:
- Demonstrated that diverse, simple chemical networks can solve the associative learning problem.
- Identified a minimal solution using only one core chemical reaction.
- Bayesian analysis revealed 'memory traces' within the chemical network's dynamics.
Conclusions:
- Cellular associative learning is achievable through various simple chemical mechanisms.
- The evolution of associative learning is plausible in diverse cellular networks, including signaling, metabolic, and gene regulatory systems.
Related Concept Videos
01:27Associative Learning
Associative learning is a fundamental concept in behavioral psychology, wherein a connection is established between two stimuli or events, leading to a learned response. This process is critical in understanding how behaviors are acquired and modified. Conditioning, the mechanism through which associations are formed, can be divided into two main types: classical conditioning and operant conditioning, each elucidating different aspects of associative learning.
Classical conditioning, also known...
Classical conditioning, also known...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:18Classical Conditioning
Associative learning, a core principle in behavioral psychology, involves forming connections between events and facilitating learned responses. This concept is vividly illustrated by classical conditioning, a process extensively studied by the Russian physiologist Ivan Pavlov. Pavlov's pioneering research on dogs' digestive systems led to the discovery that behaviors can be learned through association, laying the groundwork for classical conditioning.
Ivan Pavlov observed that dogs salivated...
Ivan Pavlov observed that dogs salivated...
01:15Real-World Application of Classical Conditioning
Classical conditioning not only includes the initial pairing of stimuli but also extends to more complex forms, such as higher-order conditioning. Higher-order conditioning involves creating associations beyond the primary conditioned stimulus, resulting in a chain of conditioned responses.
Higher-order, or second-order, conditioning occurs when a neutral stimulus becomes associated with an already established conditioned stimulus through repeated pairings. For instance, if a dog has been...
Higher-order, or second-order, conditioning occurs when a neutral stimulus becomes associated with an already established conditioned stimulus through repeated pairings. For instance, if a dog has been...
01:27Inductive Effects on Chemical Shift: Overview
The protons in unsubstituted alkanes are strongly shielded with chemical shifts below 1.8 ppm. Methine, methylene, and methyl protons appear at approximately 1.7, 1.2 and 0.7 ppm, while the proton signal from methane appears at 0.23 ppm. An electronegative substituent, such as chlorine, withdraws the electron density from the protons, increasing their chemical shift. Progressive substitution of the hydrogens in methane by chlorine shifts the proton signals increasingly downfield, to 3.05 ppm in...