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Brain waves are electrical signals generated by the neurons in the brain, which are regularly monitored to measure mental activities. Brain waves and their frequency ranges can be measured using an electroencephalogram or EEG. There are four main types of brain waves, each with distinct characteristics:
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Interference and Superposition of Waves01:07

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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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The propagation of an action potential refers to the process by which a nerve impulse, or "action potential," travels along a neuron.
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A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
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Sometimes waves do not seem to move; rather, they just vibrate in place. Unmoving waves can be seen on the surface of a glass of milk kept in a refrigerator, which is one example of standing waves. Vibrations from the refrigerator motor create waves on the milk that oscillate up and down but do not seem to move across the surface. These waves are formed or created by the superposition of two or more identical moving waves in opposite directions. The waves move through each other, with their...
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Updated: Oct 1, 2025

Author Spotlight: Unlocking New Insights in fNIRS Studies - A Novel Framework for Inter-Brain Synchrony Analysis
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Interbrain synchrony: on wavy ground.

Clay B Holroyd1

  • 1Department of Experimental Psychology, Ghent University, Henri Dunantlaan 2, 9000 Gent, Belgium.

Trends in Neurosciences
|March 3, 2022
PubMed
Summary
This summary is machine-generated.

Interbrain synchrony (IBS) research faces challenges due to undefined terms, lack of guiding theories, and flexible methods. Addressing these issues is crucial for advancing social neuroscience.

Keywords:
EEGgamma oscillationshyperscanningreplication crisissocial neurosciencetheta oscillations

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Area of Science:

  • Social Neuroscience
  • Cognitive Neuroscience
  • Neuroscience

Background:

  • Interbrain synchrony (IBS) is a proposed neural mechanism for social interaction.
  • IBS suggests functional integration between multiple brains facilitates social engagement.

Purpose of the Study:

  • Critically evaluate the current state of interbrain synchrony research.
  • Identify key theoretical and methodological limitations in the field.
  • Propose solutions to strengthen IBS as a scientific construct.

Main Methods:

  • Literature review and critical analysis of existing studies on interbrain synchrony.
  • Examination of definitions, theoretical frameworks, and empirical methodologies used in IBS research.

Main Results:

  • The field lacks a consensus definition for interbrain synchrony.
  • There is a deficit of robust theoretical models to guide IBS research.
  • Methodological flexibility in task and empirical design introduces potential biases.

Conclusions:

  • The identified issues collectively weaken interbrain synchrony as a theoretical construct.
  • Recommendations are provided to enhance the rigor and validity of IBS research.
  • Standardized definitions and theoretical frameworks are essential for future progress.