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Generalized Hooke's Law01:22

Generalized Hooke's Law

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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Generalized Anxiety Disorder01:30

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Generalized Anxiety Disorder (GAD) is a chronic condition characterized by excessive and uncontrollable worry that persists for at least six months, significantly interfering with daily functioning. Unlike situational anxiety, which arises in response to specific stressors, GAD often occurs without a clear cause. Individuals may experience disproportionate worry about work, health, or relationships. For instance, a person might continuously fear poor health despite normal medical evaluations or...
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According to George Herbert Mead, as children progress beyond the game stage, they develop a more comprehensive understanding of societal rules and norms. This cognitive and social development enables them to internalize the expectations of the broader community, refining their ability to regulate behavior.Consistent participation in organized activities is crucial in helping children recognize that their actions are not isolated but contribute to a more significant, interconnected group...
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Generalization, Discrimination, and Extinction01:24

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Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
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An increasing function exhibits a rise in output values as input values increase. This behavior is depicted graphically as a curve or line that slopes upward from left to right. Such a function satisfies the condition that if x1 < x2, then f(x1) < f(x2), indicating that the function values grow with increasing inputs. This concept is fundamental in understanding growth trends across various domains, such as population dynamics, financial investments, or resource consumption.The...
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Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
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Related Experiment Video

Updated: Feb 8, 2026

Contextual and Cued Fear Conditioning Test Using a Video Analyzing System in Mice
19:32

Contextual and Cued Fear Conditioning Test Using a Video Analyzing System in Mice

Published on: March 1, 2014

52.9K

Cued fear memory generalization increases over time.

Gabrielle A Pollack1, Jessica L Bezek1, Serena H Lee1

  • 1Department of Psychological Science, Program in Neuroscience and Behavior, Vassar College, Poughkeepsie, New York 12604 USA.

Learning & Memory (Cold Spring Harbor, N.Y.)
|June 17, 2018
PubMed
Summary
This summary is machine-generated.

Fear memory generalization increases over time, specifically for cued fear. This involves changes in brain activity-regulated cytoskeletal protein (Arc) expression in the amygdala and cortex.

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Investigating the Neural Mechanisms of Aware and Unaware Fear Memory with fMRI
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Investigating the Neural Mechanisms of Aware and Unaware Fear Memory with fMRI

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Area of Science:

  • Neuroscience
  • Memory Research
  • Synaptic Plasticity

Background:

  • Fear memory is durable but can generalize over time.
  • Understanding the mechanisms of fear memory generalization is crucial.

Purpose of the Study:

  • To investigate how cued fear memory generalizes over time.
  • To measure synaptic plasticity patterns in the cortico-amygdala circuit related to fear memory generalization.

Main Methods:

  • Auditory cued fear conditioning in mice with recent (1-d) and remote (30-d) retention intervals.
  • Assessment of generalization gradients and contextual fear generalization.
  • Immunohistochemistry to measure activity-regulated cytoskeletal protein (Arc) expression in cortico-amygdala pathways.

Main Results:

  • Cued fear memory showed increased generalization over time, distinct from contextual fear.
  • Time-dependent changes in Arc expression were observed in the cortex but not the dorsolateral amygdala.
  • Reduced Arc expression in specific cortical areas correlated with generalization, while increased expression in the prelimbic cortex correlated with discrimination.

Conclusions:

  • Time specifically influences cued fear memory generalization.
  • Synaptic plasticity in the dorsolateral amygdala, medial prefrontal cortex, and insular cortex underlies fear memory generalization over time.