Information on handedness, footedness, eyedness, and earedness was collected from 33 monozygotic (MZ) twin pairs and 67 dizygotic (DZ) twin pairs. The incidence of nonright-sidedness in the twins is not higher than that reported in the literature for singletons. Similar results are found for the other lateralities. The results of assessing handedness with preference tests do not differ from those carried out with performance tests. There are no differences in incidence of nonright-sidedness between MZ and DZ twins. The concordance of lateralities is similar in MZ and DZ twins. The proportions of Right-Right, Right-Nonright, and Nonright-Nonright pairs in both groups of twins show a binomial distribution. The present results do not confirm a genetic hypothesis of determination of sidedness in humans and are comparable with the results obtained by other twin studies.
Eine wesentliche Voraussetzung für das Studium an einer Musikhochschule ist die musikalische Eignung des Bewerbers. Ihre Prüfung wird daher sorgfältig durchgeführt, wobei die Beurteilung durch erfahrene Musikpädagogen erfolgt. Im Bestreben, diese subjektiven Ergebnisse durch objektive Aussagen zu ergänzen, entstand ein Verfahren, welches das Frequenz- bzw. Oktavdiskriminationsvermögen des Prüflings auf einfache Weise zu testen gestattet. Hierbei werden im 1-Hz-Takt die Frequenzen f1 und f2 wechselseitig auf das rechte bzw. linke Ohr mit einem definierten Schallpegel gegeben und der Prüfling aufgefordert, z.B. Frequenzgleichheit f1 = f2 (oder f1 = 2 × f2) einzustellen. Es kann gezeigt werden, dass der Betrag der Abweichung von der Sollfrequenz direkt mit der subjektiven Einschätzung der Musikalität korreliert.
The relation between tone and speech hearing in noise-induced hearing loss is argued controversely. Important publications according to which close correlations between both audiological methods are extensively supposed, are listed initially. Own research results that have already been published otherwise are introduced briefly. After that--with the help of discrimination functions on the monosyllable level--a correct order of the audibility is possible with a high hit share. The incorrect empirical adaptation of the hearing loss tables can be improved upon by quadratic optimation. Simultaneously, the polynomic functions calculated with the help of the quadratic optimation show frequency-specific characteristics. After addition of these functions one gets a virtual characteristic--tone and speech hearing--with a general character for noise-induced hearing loss. We believe that we have found by this mathematical method a new way for the solution of this difficult complex of questions. Our opinion is that the procedure mentioned above is also suitable for other types of hearing disturbances and for other languages.
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