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Related Concept Videos

Classical Conditioning01:18

Classical Conditioning

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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...
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Principles of Classical Conditioning01:23

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Classical conditioning, as described by Ivan Pavlov, is a foundational concept in associative learning, where a neutral stimulus becomes capable of eliciting a conditioned response through association with an unconditioned stimulus. The process of acquisition, where this learning occurs, and the subsequent phenomena of contiguity, contingency, generalization, discrimination, extinction, and spontaneous recovery are crucial for a comprehensive understanding of classical conditioning.
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Classical Conditioning in Daily Life01:17

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Classical conditioning, a fundamental principle of associative learning, explains various phenomena observed in daily life, such as fear development, the placebo effect, taste aversion, and drug habituation. These applications demonstrate the profound impact of associative learning on human behavior and physiological responses.
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Real-World Application of Classical Conditioning01:15

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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.
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Imaging Studies VII: Vascular Imaging01:19

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DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...
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X-ray Imaging01:24

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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Related Experiment Video

Updated: Feb 9, 2026

A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
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Classical Imaging in Callosal Agenesis.

Dhruv K Agarwal1, Sachinkumar M Patel1, Prasad Krishnan1

  • 1Department of Neurosurgery, National Neurosciences Centre, Kolkata, West Bengal, India.

Journal of Pediatric Neurosciences
|June 15, 2018
PubMed
Summary

Corpus callosal agenesis presents distinct imaging features on MRI. This article reviews these classic radiological signs for better understanding.

Area of Science:

  • Radiology
  • Neuroimaging
  • Medical Science

Background:

  • Corpus callosal agenesis is a congenital brain malformation.
  • It involves the partial or complete absence of the corpus callosum.
  • Radiological findings are crucial for diagnosis.

Purpose of the Study:

  • To revisit and illustrate the classical named radiological signs.
  • To enhance understanding of imaging findings in corpus callosal agenesis.
  • To provide a reference for radiologists and clinicians.

Main Methods:

  • Review of magnetic resonance imaging (MRI) studies.
  • Identification and description of characteristic radiological signs.
  • Correlation of imaging findings with the diagnosis of corpus callosal agenesis.
Keywords:
Corpus callosum agenesismoose head appearanceracing car signsunray sign

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Main Results:

  • Detailed description of specific named radiological signs associated with corpus callosal agenesis.
  • Illustrations of these signs on MRI.
  • Emphasis on the diagnostic utility of these signs.

Conclusions:

  • Corpus callosal agenesis has recognizable patterns on MRI.
  • Familiarity with these named signs aids accurate diagnosis.
  • These radiological signs are fundamental in the evaluation of this condition.