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Unformatted text preview: attached to their umbilical cords.
Finally, newly born pups are exposed to thermal stimulation,
as they rapidly cool to the temperature of the postnatal
Perinatal Perceptions in Utero and ex Utero
There is little question that the perinatal rat is able to
detect tactile, vestibular, and thermal stimulation (Alberts,
1984; Kirby, 1979; Lane, 1917; Narayanan et al., 1971; linear acceleration angutar acceleration 0 1 0
a 1 45 45
a 20 20
0 70 70
0 2 2 55 55
100 100 0 0 0 0
0 Values are percentages. Scores are as follows: 0, failure to right; 1, attempt to ri
Values are percentages. Scores are as follows: 0, failure to right; 1, attempt
within eacheach 71 with differing superscripts different (P ,(P , 0.05).
within row with differing superscripts are are different 0.05).
deliver y Angular forces on offspring in utero TO SENSORY EXPERIENCE gestatio n 21 0 S SynSyn neonates. Figure 4 shows the percentageneo- relative t
neonates. Figure 4 shows the percentage of of neo- relativ
nates 4in each group that successfully righted them- Syn, 2672
nates in each group thatControl
successfully righted them- Syn,
selves2(i.e.,l achieved a score of 2) on P1, 6P3, P3, and P5. On ,P0.01;
selves (i.e., achieved a score of 2) on P1, and P5. On P
P1, P1,fewer proportion of Flt Flt neonates successfully
a 0 a z axis
fewer proportion of neonates successfully
righted themselves compared with SynSyn Viv Viv neo- DISCU
righted themselves compared with or or neo- DISCUSSIO
nates, as measured by the the assignmentaof a score2of 2
nates, as measured by assignment of score of
[Flt, Syn, x (1) 5 6.1,6.1, P , 0.01; Flt, Viv,(1) 5 12.5,
[Flt, Syn, x (1) 5 P , 0.01; Flt, Viv, x x2 (1) 5 12.5, Prenata
P , 0.001]. Similar proportions of SynSyn X Viv Viv neo- period
P , 0.001]. Similar proportions of andand neo- period du
nates showed complete righting responses [Fig. 3; Syn, ﬁrst takes
nates showed complete righting res...
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This document was uploaded on 04/06/2014.
- Fall '13