Search for dissertations about: "CRITICAL PERIOD"

Showing result 1 - 5 of 388 swedish dissertations containing the words CRITICAL PERIOD.

2. 1. Neurotoxic Effects of Nicotine During Neonatal Brain Development : Critical Period and Adult Susceptibility

   Author : Emma Ankarberg; Per Eriksson; Richard F. Seegal; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Biology; nicotine; neonatal development; behaviour; nicotinic receptors; susceptibility; cholinergic system; paraoxon; PBDE; Biologi; Biology; Biologi;

   Abstract : This thesis examined neurotoxic effects of nicotine exposure during a defined critical period of neonatal brain development in mice.In our environment there are numerous hazardous contaminants that an individual can be exposed to during its entire lifetime. READ MORE

4. 2. Critical loads - assessment of uncertainty

   Author : Andreas Barkman; Avdelningen för kemiteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; landscape planning; regionalisation; forestry; BC Al; sensitivity analysis; risk assessment; Monte Carlo simulation; PROFILE; critical level; exceedance; Acidification; forest soil; policy; EMEP; GIS.; Chemical technology and engineering; Kemiteknik och kemisk teknologi;

   Abstract : The effects of data uncertainty in applications of the critical loads concept were investigated on different spatial resolutions in Sweden and northern Czech Republic. Critical loads of acidity (CL) were calculated for Sweden using the biogeochemical model PROFILE. READ MORE

5. 3. Age differences in first language attrition : A maturational constraints perspective

   Author : Emanuel Bylund Spångberg; Kenneth Hyltenstam; Niclas Abrahamsson; Silvina Montrul; Stockholms universitet; []
   Keywords : HUMANIORA; HUMANITIES; first language attrition; age differences; maturational constraints; critical period; language acquisition; bilingualism; international adoptees; conceptual proficiency; language aptitude; Bilingualism; Tvåspråkighet; tvåspråkighetsforskning; Bilingualism;

   Abstract : This thesis investigates age-related differences in first language (L1) attrition in a second language (L2) setting. The thesis is based on four individual studies. READ MORE

6. 4. The Effects of Age of Onset on VOT in L2 Aquisition and L1 Attrition : A Study of the Speech Production and Perception of Advanced Spanish-Swedish Bilinguals

   Author : Katrin Stölten; Niclas Abrahamsson; Ulla Sundberg; Kirk Sullivan; Stockholms universitet; []
   Keywords : HUMANIORA; HUMANITIES; second language acquisition; first language attrition; maturational constraints; critical period; voice onset time; stop production; categorical perception; activation threshold hypothesis; L1 use; highly proficient L2 learners; L1 Spanish; L2 Swedish; Bilingualism; tvåspråkighet;

   Abstract : This thesis explores the role of age in second language (L2) acquisition and first language (L1) attrition. The focus is on Voice Onset Time (VOT) in the production and categorical perception of word-initial L1 and L2 stops in highly advanced L1 Spanish learners of L2 Swedish. READ MORE

7. 5. Age and Constraints on Language Learning : First Language Retention and Second Language Acquisition in International Adoptees

   Author : Gunnar Norrman; Emanuel Bylund Spångberg; Guillaume Thierry; Janet Werker; Stockholms universitet; []
   Keywords : HUMANIORA; HUMANITIES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; bilingualism; critical period; electroencephalography; event-related potentials; first language retention; international adoption; phonology; second language acquisition; Bilingualism; tvåspråkighet;

   Abstract : This thesis investigates the influence of age of acquisition on the long-term second language development of international adoptees. Because age of acquisition typically coincides with the onset of bilingualism, the study of maturational age effects in second language acquisition has been empirically and conceptually entangled with changes in language input and use. READ MORE