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Related Experiment Video

Updated: Jun 7, 2026

Infant Auditory Processing and Event-related Brain Oscillations

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Cyclic alternating pattern in normal children aged 12 to 24 months.

Gabriela Rodrigues Alves¹, Agostinho Rosa, Magneide Brito

¹Department of Psychobiology, Federal University of São Paulo, São Paulo, SP, Brazil. gabriela@psicobio.epm.br

Arquivos De Neuro-Psiquiatria

|November 5, 2010

Summary

Cyclic alternating pattern (CAP) in children aged 12-24 months increases by 2% monthly, reaching 35% by 24 months. This study provides normative data on CAP expression in this age group.

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Portable Intermodal Preferential Looking (IPL): Investigating Language Comprehension in Typically Developing Toddlers and Young Children with Autism

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Published on: December 14, 2012

Area of Science:

Pediatric Sleep Medicine
Neurophysiology
Child Development

Background:

Cyclic alternating pattern (CAP) is a key indicator of sleep quality and maturity.
Limited data exists on CAP expression in infants aged 12-24 months.

Purpose of the Study:

To establish normative data for CAP expression in children aged 12-24 months.
To characterize the developmental trajectory of CAP in this age group.

Main Methods:

A descriptive study involving 12 healthy children (6 girls, 6 boys) aged 12-24 months.
Standard polysomnography was conducted in a pediatric sleep laboratory.
Sleep stages and CAP were analyzed using international guidelines.

Main Results:

The average CAP rate was 25.78 ± 10.18%, showing a linear increase of 2% per month.
CAP rate correlated with age (R² = 0.91), from 12% at 12 months to 35% at 24 months.
Details on A-phase duration, B-phase duration, CAP cycles, and CAP sequences were recorded.

Conclusions:

This study provides essential normative data for CAP in 12-24 month olds.
A significant finding is the consistent 2% monthly increase in CAP rate during this developmental period.
These findings contribute to understanding sleep maturation in early childhood.