Unformatted text preview: ger to achieve than did Controls. r\ cooling difference, we think, was a consequence of the increased numbers of surfaces
Control for walking and crawling. Many of the rats’ moveFlight
ments from surface to surface involved rolling movements on the longitudinal
Smotherman & Robinson, 1988a), but the degree to which).
body axis (see Fig. 3
these subjects are able to process sThese flight-induced alterations in maternal movements changed the pattern
timulation is unknown.
During the perinatal period the rat undergoes substantial
of prenatal vestibular input to fetuses in utero and were associated with striking
physical growth and neural maturation. Corresponding imchanges n fetal preprovements in sensory-perceptual functioin can bevestibular morphology and perception (Ronca et al., 2000).
Figure 9. Chronological appearance of maternal sources of pup
available in microgravity
stimulation across the perinatal period. sumed from neurobiological analyses; however, there exist
virtually no empirical data with which to assess the development of sensory-perceptual Fetuses from NIH.R1sand NIH.R2
function in these subject
(see Alberts, 1984). Thus, it is presently impossible to determine the impact on perinatal Several oinvestigators who analyzed fetal tissues from NIH.R1 and R2 disoffspring f stimuli present
within the fetal and newborn habitats.
covered differences between space flight- and Earth-gestated fetuses. Among the
There is a similar lack of data with which to quantify
noteworthy impinge on
specific tactile, vestibular, and thermal cues that findings were:
perinatal organisms. We have recently begun to make direct
measurements of such stimuli in th(a)at (R1 fetuses showed a six-fold increase in atrial natriuretic peptide (ANP),
e r Ronca & Alberts,
1991), and can offer some preliminary comments on the
a cardiovascular-related hormone that regulates sodium and water
nature of available stimulation.
Maternal activities during gestation, labor, a...
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