Neonatal stress alters habituation of exploratory behavior in adult male but not female rats

被引:40
|
作者
Dubovicky, M
Skultétyová, S
Jezová, D
机构
[1] Slovak Acad Sci, Inst Expt Pharmacol, Bratislava 84216, Slovakia
[2] Slovak Acad Sci, Inst Expt Endocrinol, Bratislava 84216, Slovakia
关键词
rat; monosodium-L-glutamate; open field; exploratory behavior; habituation; gender differences; neonatal stress; handling;
D O I
10.1016/S0091-3057(99)00166-5
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
The effect of monosodium-L-glutamate (MSG) administration in the neonatal period on habituation of exploratory behavior related to gender differences was investigated. Rats of both sexes were intraperitoneally treated with MSG (4 mg/g) or hypertonic saline (10% NaCl) on postnatal days 2, 4, 6, 8, and 10. On postnatal day 65, the animals were tested in an open-field test during 4 consecutive days, once daily in 6-min sessions. The rapidity of habituation of exploratory behavior during repeated exposure to the open field (interrupted habituation) and over individual sessions (uninterrupted habituation) was evaluated by using the method of linear regression. Compared to intact controls, there were no significant differences found in interrupted habituation, neither in males nor in females. Uninterrupted habituation in neonatally treated males was slowed down in the first 2 days of testing. No differences in adult behavior between treated groups (MSG and hypertonic saline) were observed, i.e., there were no late effects specific for neonatal MSG administration. In females, uninterrupted habituation was not affected. Males proved to be more sensitive to neonatal stress associated with injections of MSG or hypertonic saline than females, and showed feminine-like habituation in the new environment. (C) 1999 Elsevier Science Inc.
引用
收藏
页码:681 / 686
页数:6
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