Utjecaj predočivosti na leksičko-semantičku obradu asocijacija u prvoj epizodi psihoze

Kužina, Iva. (2019). Utjecaj predočivosti na leksičko-semantičku obradu asocijacija u prvoj epizodi psihoze. Diploma Thesis. Filozofski fakultet u Zagrebu, Department of Linguistics. [mentor Sekulić Sović, Martina and Erdeljac, Vlasta].

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Abstract

This master thesis gives an overview of a study of language production and reception of associations depending on the lexical-semantic imageability feature in subjects with first episode and early course psychosis. First part of the thesis gives an overview of previous studies and theoretical perspectives on language deficits in psychosis. Studies on associationsin schizophreniaare numerous because looseassociations are one of the firstdescribedsymptoms and one of the most prominent language processing symptoms in schizophrenia(as part of psychosis). Furthermore, words withalow value of the lexical-semantic feature imageability, unlike words with high imageability, demand a higher cognitive effort in creation of their mental image and activation of concepts in the semantic memory. The second part of the thesis gives an overview of the study which included two tests, a language reception and production test, which were constructed for the purposeof the study on the basis of an existing database of psycholinguistic lexical-semantic features (Erdeljac et al., 2018). The study included 12 subjects with first episodeand early course psychosisand 12 healthy subjects for the control group. It was confirmed that the target group, subjects with first episode and early course psychosis, differently processes language on account of the imageability feature in the production test, and on both test the target group had longer reaction times than the healthy control group. Furthermore, in the reception test both groups chose statistically more associations that were of high and medium frequency, when compared to low frequency words, and the target group had longer reaction times on high and medium frequency words when compared to low frequency words. Results analysis was conducted according to actual psycholinguistic theories and further validated the theory that subjects with schizophrenia have an increased activation and a decrease of inhibition in spreading of activation in the semantic memory in language processing.

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