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Library's collection Library's IT development CancelIn this study, I investigated the contribution of genes and environment
towards speech disfluency phenomenon produced by identical twins. In order to
find the influence of genes and environment towards similarities and differences
of disfluency types and frequencies, I used the descriptive-quantitative approach
by investigating two pairs of identical twins (one pair having a shared
environment and the other one having a non-shared environment). In collecting
the shared and non-shared environmental background of the two pairs of identical
twins, I conducted interview which was done in three stages whereas in collecting
the speech disfluency data, I used HCRC Map Task role-play proposed by Human
Communication Research Center. The types of speech disfluency data were then
analyzed and categorized using Levelt?s theory. The frequencies of the disfluent
speech were counted per minute.. The findings show that the twins with shared
environment were similar in the frequency but different in the types. The twins
with non-shared environment were different in the frequency but similar in the
types. The cross comparison between the two pairs also show some similarities
and differences in the types and frequencies. The interpretations of the findings
were based on Scarr and McCartney?s theory of Gene-Environment Interaction.
The results may imply that shared and non-shared environments influence the
twins? disfluency frequency but not their disfluency types. Any similarities and
differences appeared in the types indicate the relation between the disfluency
types and the speaker?s personality. Gene, which is inherited since one is born,
gives potential effect which later during lifetime will interact with environment
and cause the appearance of similarities and differences between the twins in this
study.