Day 24_Goldstein Lecture What is Development

Finally newly born pups are exposed to thermal

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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 environment. 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 10c 10c 0 0 70 70 30e 30e 0 0 2 2 55 55 10 10 60g 60g 100 100 0 0 0 0 b 9 0d 0 9b 0d 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). row 185 labor 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 6 nates 4in each group that successfully righted them- Syn, 2672 nates in each group thatControl successfully righted them- Syn, Flight 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 ,0 retrieva 4 P1, P1,fewer proportion of Flt Flt neonates successfully a 0 a z axis fewer proportion of neonates successfully 2 Z righted themselves compared with SynSyn Viv Viv neo- DISCU righted themselves compared with or or neo- DISCUSSIO 0 x axis nates, as measured by the the assignmentaof a score2of 2 nates, as measured by assignment of score of retrieval 2 contractions 2 2 Pren [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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