scholarly journals Fraternal Twin

2020 ◽  
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1971 ◽  
Vol 118 (545) ◽  
pp. 453-460 ◽  
Author(s):  
Michael Carter ◽  
C. A. H. Watts

There is good evidence that genetic factors are necessary, though by no means sufficient, for the development of schizophrenia. Several studies have compared the incidence of schizophrenia in identical and in fraternal twin pairs: these studies are discussed, for example, in the Medical Research Council Annual Report 1965–66 (pp. 54–61), where Essen-Möller's (1963) cumulative figures are quoted: Identical (MZ) pairs: 69 per cent concordant for schizophrenia (both schizophrenic) (194/280 pairs). Fraternal (DZ) pairs: 13 per cent concordant for schizophrenia (both schizophrenic) (59/448 pairs).


2016 ◽  
Vol 49 (2) ◽  
pp. 95-107 ◽  
Author(s):  
Angelika Gensthaler ◽  
Verena Maichrowitz ◽  
Michael Kaess ◽  
Marc Ligges ◽  
Christine M. Freitag ◽  
...  

2003 ◽  
Vol 92 (2) ◽  
pp. 481-487 ◽  
Author(s):  
Katsuko Niwano ◽  
Kuniaki Sugai

In this study a mother's instinctive accommodations of vocal fundamental frequency (f0) of infant-directed speech to two different infants was explored. Maternal speech directed to individual 3-mo.-old fraternal twin-infants was subjected to acoustic analysis. Natural samples of infant-directed speech were recorded at home. There were differences in the rate of infants' vocal responses. The mother changed her f0 and patterns of intonation contour when she spoke to each infant. When she spoke to the infant whose vocal response was less frequent than the other infant, she used a higher mean f0 and a rising intonation contour more than when she spoke to the other infant. The result suggested that the mother's speech characteristic is not inflexible and that the mother may use a higher f0 and rising contour as a strategy to elicit an infant's less frequent vocal response.


1972 ◽  
Vol 81 (5) ◽  
pp. 1019-1024 ◽  
Author(s):  
Margaret G. Norman ◽  
John C. Steele

1991 ◽  
Vol 12 (5) ◽  
pp. 137-140 ◽  
Author(s):  
Randall Ellis Morris
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2018 ◽  
Vol 04 (02) ◽  
Author(s):  
Sarah Sadavoy ◽  
Steven Stahler
Keyword(s):  

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