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Unformatted text preview: D Table 2. Percentage of contact andand water-immersion righting r
Table 2. Percentage of contact water-immersion righting respo
observed in neonatal ratsrats that underwent prenatal developmen
observed in neonatal that underwent prenatal development sp
62 A. RONCA, C. L AMKIN , AND J. ALBERTS showed that fetuses can detect certain cues that normally
increasingly susceptible to extrinsic s timul i as the a mniotic
imping e on it w ithi n in the uterine environment . Thus, precushio n shrinks. Locomotion and other a ctivitie s of the
natal organisms can detect and respond to sensory cues.
mother may p itch , t urn , accelerate, and expose fetuses to
However, the sensory aspects of the uterine environmen t are
mechanical pressures. D urin g parturition, u terin e contracpoorly understood.
tions create intense mechanical pressures, squeezing, and
The mother's behavior and physiology are almost cermoving the fetus along the birth canal. On delivery the
tainl y the major sources of fetal sensory experience. Maternewborn is exposed to a range of novel sensory experiences
nal contributions to the intrauterine acoustic environment
as the mother licks, handles, and carries o ffspring .
hav e been demonstrated in such species as h uman s and
Tactile, vestibular, and thermal sensitivities may play spesheep, in which auditory function has prenatal onset.
cial roles during perinatal life. These modalities are among
Decasper and Fifer (1980) demonstrated newborns' recogthe first to emerge in vertebrate development (Alberts,
nitio n of specific acoustic events, based on prenatal auditory
1984; Gottlieb, 1971). Even in altricial species, such as the
experience. Other features of the intrauterine acoustic enviNorwa y rat, these early developing systems begin to operate
ronmen t that may hold salience for the f etu s include the
prenatall y and t hu s provide the earliest forms of sensory
materna l heartbeat, pulse , and borborygmi, t ha t is, the auTo i dentif y specific tactile and vestibular stimuli to w hich
dible by-products of digestion (Fifer & Mo...
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This document was uploaded on 04/06/2014.
- Fall '13