Related Experiment Video
Updated: Aug 18, 2026
Infant Auditory Processing and Event-related Brain Oscillations
Published on: July 1, 2015
Obstetric history and the heart-rate response of newborns to sound
Two groups of clinically normal newborns, differing in the number of non-optimal factors in their obstetric history, were compared by measuring heart-rate response to a series of auditory stimuli. There was a significant difference between the groups in the direction of the average heart-rate response. The high risk" group showed more heart-rate acceleration and less deceleration compared with the "low-risk" group. The heart-rate responses were significantly related to the number of non-optimal obstetric conditions and to parity, but not to the maternal pre-delivery medication score. The greater the "risk" at birth, the less was the deceleration; the greater the maternal parity, the less did acceleration occur in response to auditory stimulation. There was no significant difference between the high-risk and low-rsik groups in heart-rate response trends over trials. Both groups showed reliable diminution of deceleration heart-rate response over trials.
Two groups of clinically normal newborns, differing in the number of non-optimal factors in their obstetric history, were compared by measuring heart-rate response to a series of auditory stimuli. There was a significant difference between the groups in the direction of the average heart-rate response. The high risk" group showed more heart-rate acceleration and less deceleration compared with the "low-risk" group. The heart-rate responses were significantly related to the number of non-optimal obstetric conditions and to parity, but not to the maternal pre-delivery medication score. The greater the "risk" at birth, the less was the deceleration; the greater the maternal parity, the less did acceleration occur in response to auditory stimulation. There was no significant difference between the high-risk and low-rsik groups in heart-rate response trends over trials. Both groups showed reliable diminution of deceleration heart-rate response over trials.
Related Concept Videos
01:17Assessment of apical pulse
Assessing the apical pulse is a critical nursing procedure, particularly indicated for:
01:28Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
01:15Heart Sounds
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
01:14Fetal Circulation
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
01:25Assessment of the Cardiovascular System IV: Auscultation
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.