This paper makes
an attempt to investigate the effect of bipolar mood disorder on the basis of using
the lexical cohesion elements (that is, repetition, synonymy, antonymy,
hyponymy, and collocation) in a case study approach based on the fact that approximately
one percent of people suffer from this kind of affective disorder.
Specifically, a large number of artists are afflicted by the very disorder presumably
due to their creativity. The private letters of Sadegh Hedayat, mostly known as
an Iranian eminent writer suffering from bipolar mood disorder, to Shahid
Nourai, one of his friends, are selected as the material of the study. The
addressee is kept fixed noticeably to remove the effective linguistic features.
Sadegh Hedayat’s letters have been studied regarding mentioned linguistic
elements in terms of two major bipolar mood disorder episodes (that is to say,
hypomanic and depressive). In the study, all the letters related to hypomanic
and depressive episodes are investigated using the elements of lexical cohesion.
Furthermore, all the words on the basis of the elements with respect to various
ties, i.e. immediate, mediate, and remote, are counted and the averages are
evaluated using SPSS with the aim of finding any noteworthy result to discover
whether specific psychological mood affects the use of certain lexical cohesion
elements or not. Moreover, it explores whether there is any significant difference
between bipolar mood disorder and schizophrenia on the basis of previous
studies. The statistical analysis shows a highly significant difference
concerning antonymy and hyponymy between hypomania and depression. No
significant difference is found with respect to repetition, synonymy, and
collocation. In addition, the results suggest that the text analyzed in the
research is cohesive as regards bipolar mood disorder in contrast to those
studies conducted related to schizophrenia.