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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:

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Related Experiment Video

Updated: Jun 9, 2026

Cortical Source Analysis of High-Density EEG Recordings in Children

Cortical Source Analysis of High-Density EEG Recordings in Children

Published on: June 30, 2014

The Development of Global-Level Categorization: Frequency Tagging EEG Responses.

Stefanie Peykarjou^1,2, Stefanie Hoehl³, Sabina Pauen¹

¹Department of Psychology, Heidelberg University, 69117 Heidelberg, Germany.

|June 27, 2024

Summary

This summary is machine-generated.

Humans can categorize visual objects into broad groups like living and non-living from four months old. This ability for global categorization develops early and remains consistent into adulthood.

Keywords:

EEG Fast Periodic Visual Stimulation (FPVS)categorization frequency tagging global

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Last Updated: Jun 9, 2026

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Concurrent Recording of Co-localized Electroencephalography and Local Field Potential in Rodent

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Published on: November 30, 2017

Area of Science:

Cognitive Science
Developmental Psychology
Neuroscience

Background:

Adults and infants form abstract object categories.
Development of global categorization is not well understood.
Investigating early visual categorization abilities is crucial.

Purpose of the Study:

Characterize the development of very fast global categorization (living vs. non-living).
Determine the contribution of low-level stimulus characteristics to categorization.
Assess categorization across different age groups from infancy to adulthood.

Main Methods:

Frequency tagging technique used to measure categorization.
Oddball paradigm with category changes (AAAABAAAABA...).
Participants included infants (4, 7, 11 months), children (5-6 years), and adults.

Main Results:

Strong, significant high-level categorization observed in all age groups.
Reduced categorization responses for phase-scrambled control stimuli.
No significant differences in categorizing living versus non-living objects.

Conclusions:

High-level visual categorization (living/non-living) is present from four months of age.
Humans are sensitive to broad categorical information early in development.
Supports the early emergence of sophisticated visual processing in infants.