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ABSTRACT Post-rotatory nystagmus (P-RN) is an easily elicited reflex which has been found to be abnormal in developmentally delayed children. P-RN has been recorded in newborn infants,but

limited information is presently available. Thirty-six healthy full-term infants were tested at 1, 2, 4, 6, 9 and 12 mo. of age. Infants were held in a rotational chair, spun in the dark for

one minute at a constant angular velocity (150°/sec) and then abruptly stopped. P-RN occurrence, duration of primary nystagmus (reversal time), time constant values

(Tc=cupula,Ta=adaptation) and intersaccadic intervals (time between fast components) were recorded, measured and analyzed (ANOVA). P-RN was elicited more frequently in older infants. Mean

reversal time was 23.6 sec. at 1 mo. and increased linearly with age, approaching by 12 mo. those of children and adults (34.8 sec). Cupula and adaptation times (Tc and Ta) varied with the

individual, did not change with age and were similar to those reported for adults. Mean intersaccadic interval (ISI) was 0.49 and 0.64 sec. at 1 and 12 mo.,respectively. P-RN is present at 1

mo. of age and can be reliably measured if wakefulness is maintained. Adult-like values for Tc and Ta reflect a relatively mature vestibular system. Reversal time appears to be a sensitive

measure of vestibular function and shows maturational changes during the first year of life. Preliminary evaluation of ISI suggests that this system is functional early in life. These data

may be valuable for comparison with those of infants at risk for developmental delay. ARTICLE PDF AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * (Spon. by Grant Morrow, III) Ohio State

Univ.College of Med., OSU hospitals, Dept. of Pediatrics and Anatomy, Columbus, Ohio Leandro Cordero Jr., David L Clark & Marina I Liscano Authors * Leandro Cordero Jr. View author

publications You can also search for this author inPubMed Google Scholar * David L Clark View author publications You can also search for this author inPubMed Google Scholar * Marina I

Liscano View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Cordero, L.,

Clark, D. & Liscano, M. 1281 POST-ROTATORY NYSTAGMUS IN THE FULL-TERM INFANT. _Pediatr Res_ 15 (Suppl 4), 656 (1981). https://doi.org/10.1203/00006450-198104001-01310 Download citation

* Issue Date: 01 April 1981 * DOI: https://doi.org/10.1203/00006450-198104001-01310 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get

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