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Spontaneity

Spontaneity

A spontaneous process is one that occurs naturally under certain conditions. A nonspontaneous process, on the other hand, will not take place unless it is “driven” by the continual input of energy from an external source. Processes have a natural tendency to occur in one direction under a given set of conditions. Water will naturally flow downhill (spontaneous process), but uphill flow (nonspontaneous process) requires outside intervention such as the use of a pump. Iron exposed to...

Fixed Action Patterns

Fixed Action Patterns

A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.

What is Behavior?

What is Behavior?

Behaviors are actions that an organism engages in—they can be related to finding food, reproducing, defending against threats, and many other possible actions. Behaviors include activities related to the environment around the animal—such as migration—as well as social interactions within a species or population. Many behaviors involve motor output—that is, muscle movements—while others involve less visible actions, such as learning.

Organic Compounds

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...

Spontaneous and Induced Mutations

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).

Levels of Organization

Levels of Organization

Biological organization is the classification of biological structures, ranging from atoms at the bottom of the hierarchy to the Earth's biosphere. Each level of the hierarchy represents an increase in complexity that builds upon the previous level.
Molecules Are Composed of Atoms, and Biomolecules Are Assembled from Molecules:
The most basic levels include atoms, molecules, and biomolecules. Atoms, the smallest unit of ordinary matter, are composed of a nucleus and electrons. Molecules...

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Related Experiment Video

Updated: Feb 15, 2026

Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster

Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster

Published on: April 10, 2014

Active State Organization of Spontaneous Behavioral Patterns.

C Hillar¹, G Onnis¹, D Rhea¹

¹University of California, San Francisco Department of Psychiatry, 1550 4th Street, San Francisco, CA, 94158, USA.

Scientific Reports

|January 20, 2018

Summary

Researchers developed a new method to analyze mouse behavior, identifying "Active" and "Inactive" states. This approach accurately genotypes mice based on behavior alone, advancing behavioral neuroscience.

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Last Updated: Feb 15, 2026

Determination of the Spontaneous Locomotor Activity in Drosophila melanogaster

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Published on: April 10, 2014

Acute Mouse Brain Slicing to Investigate Spontaneous Hippocampal Network Activity

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Published on: August 28, 2020

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Area of Science:

Behavioral neuroscience
Animal behavior analysis
Genetics

Background:

Understanding the organization of spontaneous behaviors in mice is crucial for behavioral neuroscience.
Current methods may not fully capture the complexity of home cage activities.

Purpose of the Study:

To develop and validate an analytical approach for organizing diverse mouse home cage behaviors.
To define and automate the detection of distinct behavioral states.

Main Methods:

Development of a principled analytical approach to define and detect "Active" and "Inactive" behavioral states.
Analysis of a large, multimodal dataset from 16 mouse strains.
Application of supervised machine learning for genotyping.

Main Results:

Identification of two mutually-exclusive, low-dimensional spatiotemporal units of behavior: "Active" and "Inactive" States.
Novel insights into the coordinated expression of feeding, drinking, and movement behaviors in Mus Musculus.
Demonstration that Active State patterns are highly strain-specific, enabling 99% accurate genotyping via machine learning.

Conclusions:

The developed approach advances the understanding of spontaneous behavior organization in mice.
This method provides a high-throughput phenotyping strategy applicable to behavioral neuroscience and disease models.
Behavioral data alone can be used for accurate genetic identification of mouse strains.