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Brain Waves

Brain Waves

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:

Lateralization

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.

Major Somatic Sensory Pathways

Major Somatic Sensory Pathways

Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the...

Anatomy of the Brain: Ventricles

Anatomy of the Brain: Ventricles

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The Vestibular System

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Lobes of the Cerebrum

Lobes of the Cerebrum

The cerebral cortex, a critical structure of the brain, is intricately divided into two hemispheres, each consisting of four distinct lobes: occipital, temporal, frontal, and parietal. These lobes function cooperatively to regulate various cognitive and sensory functions, forming the basis of our complex neural capabilities.
Frontal lobe
The frontal lobes, located behind the forehead, are the command center of our brain, controlling personality, intelligence, and voluntary muscle movements....

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Related Experiment Video

Updated: Nov 9, 2025

Activity of Posterior Lateral Line Afferent Neurons during Swimming in Zebrafish

Activity of Posterior Lateral Line Afferent Neurons during Swimming in Zebrafish

Published on: February 10, 2021

Lateral line: From water waves to brain waves.

Brian M McDermott¹

¹Department of Otolaryngology - Head and Neck Surgery, Case Western Reserve University School of Medicine, Cleveland, OH 44106, USA.

Current Biology : CB

|April 13, 2021

Summary

This summary is machine-generated.

Fish navigation relies on the lateral line system. New research shows brain response patterns, not the system's order, are key for swimming against currents.

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Published on: November 28, 2018

Area of Science:

Neuroethology
Sensory biology
Hydrodynamics

Background:

The lateral line system is crucial for fish to perceive water movement and navigate.
Previous understanding emphasized the structural order of lateral line neuromasts for sensory input.
Navigating against currents requires precise processing of hydrodynamic information.

Purpose of the Study:

To investigate the role of lateral line system organization versus neural processing in rheotaxis (current-oriented movement).
To determine the primary factors enabling fish to maintain position in flowing water.

Main Methods:

Utilized behavioral experiments with fish in controlled water currents.
Employed neurophysiological recordings to analyze brain activity patterns.
Manipulated or observed variations in lateral line system structure and neural responses.

Main Results:

The specific arrangement or order of lateral line sensory organs was found to be less critical than anticipated.
Asymmetries in brain responses to lateral line input significantly correlated with successful rheotaxis.
Neural processing, particularly lateralization, appears to be the dominant factor in current navigation.

Conclusions:

Fish rheotaxis is primarily governed by how the brain processes lateral line information, specifically response asymmetries.
This finding shifts focus from peripheral sensory organization to central neural mechanisms in fish hydrodynamics.
Highlights the importance of neural plasticity and lateralization in sensory-guided behaviors.