Alexandra Prentza

Dr. Alexandra Prentza


Research Focus & Metrics

Academic Career Length

7Years (2020-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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19 July 2023 in Brain Sciences
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Journal Article
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Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
VSVassiliki Siafaka
Vassiliki Siafaka
LVLouiza Voniati
Louiza Voniati
APAlexandra Prentza
Alexandra Prentza
Angelos PapadopoulosAngelos Papadopoulos
Angelos Papadopoulos
SKSpiros Konitsiotis
Spiros Konitsiotis
One of the components of a dementia diagnosis is the assessment of functional abilities. These abilities are measured via screeners, such as the Instrumental Activities of Daily Living (IADL) scale. The IADL scale is a valid tool that has been adapted in many languages. This study aimed to provide a cut-off point and validate the Greek version of the IADL scale in populations with cognitive impairment. IADL data were collected from 132 individuals: 24 PD patients, 24 Parkinson’s disease dementia (PDD) patients, and 24 AD patients. The remaining 60 participants were cognitive healthy adults (CHAs). The CHA group and the PD group served as the cognitively unimpaired group (CUG), while the PDD and AD groups served as the cognitively impaired group (CIG). Additionally, the MMSE, the AMTS, the Clock Drawing Test CDT, the Arizona Battery for Communication Disorders of Dementia (ABCD), the NPI, and the GDS-15 were administered to the participants. Statistically significant differences in the IADL scores were exhibited between all subgroups. The IADL scale showed high internal consistency (Cronbach’s alpha = 0.890). A threshold equal to 6.00 (AUC = 0.888, p < 0.001) was estimated between the CUG and the CIG. Significant positive correlations were observed between IADL and MMSE (r = 0.764, p < 0.001), IADL and AMTS (r = 0.724, p < 0.001), IADL and ABCD (r = 0.702, p < 0.001), and IADL and CDT (r = 0.627, p < 0.001) results. Given the obtained results, the IADL scale is a valid tool for clinical use with high reliability and sensitivity. Also, the IADL scale is a valuable instrument for screening functional abilities associated with cognitive impairment.

14 March 2022 in Journal of Psycholinguistic Research
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Journal Article
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APAlexandra Prentza
Alexandra Prentza
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
VCVasiliki Chondrogianni
Vasiliki Chondrogianni
Ianthi Maria TsimpliIanthi Maria Tsimpli
Ianthi Maria Tsimpli

1 January 2020 in Open Linguistics
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Journal Article
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APAlexandra Prentza
Alexandra Prentza
MKMaria Kaltsa
Maria Kaltsa
This is the first attempt to profile the heritage speakers of an endangered spoken-only variety of Vlach Aromanian in Greece. Neither the variety nor its speakers has been investigated before; hence, the study also aims at evaluating the exact state of endangerment of the Sirrako variety, as this is revealed by the language practices and skills of its bilingual speakers. To this aim, a background questionnaire was developed and administered to 60 bilingual speakers of Vlach Aromanian and Greek including questions on the age of onset of exposure to both languages, early home language practices, current language practices (orality and literacy) and attitudes toward the heritage and majority language. Significant variation in language practices, literacy skills, oral input and current competence across three generations of speakers was identified with a substantial decline in heritage language competence in younger bilinguals, verifying our claim of the endangered state of Vlach Aromanian.

29 October 2020 in Applied Neuropsychology: Adult
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Journal Article
Closed access
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
NZNafsika Ziavra
Nafsika Ziavra
APAlexandra Prentza
Alexandra Prentza
VSVassiliki Siafaka
Vassiliki Siafaka
Vasiliki ZarokanellouVasiliki Zarokanellou
Vasiliki Zarokanellou
SKSpiros Konitsiotis
Spiros Konitsiotis
Screening people’s cognitive skills have been proven essential for reference to full assessment. These methods include short scales, such as the Abbreviated Mental Test Score (AMTS). The AMTS is a valid 10-item questionnaire that has been translated into many languages, but not in Greek yet. The aim of this study is the validation of the Greek version of the AMTS with an additional estimation of its cutoff scores. About 132 individuals [60 controls and 72 patients (24 with Parkinson’s disease (PD), 24 with Parkinson’s disease dementia (PDD), and 24 with Alzheimer’s disease (AD)] participated in this study. All participants besides the AMTS completed the Mini Mental State Examination (MMSE), the Tuokko’s Clock Drawing Test (CDT), the Instrumental Activities of Daily Living (IADL), the Arizona Battery for Communication Disorders of Dementia (ABCD), the Hellenic versions of the Neuropsychiatric Inventory (NPI), and the Geriatric Depression Scale (GDS-15). Statistically significant differences were found between all subgroups for the AMTS. The AMTS showed high internal consistency (Cronbach alpha = 0.819 and coefficient omega ω = 0.814). A threshold equal to 6.50 (AUC: 0.908, p = 0.000) between groups with and without cognitive impairment was calculated. The AMTS was significantly correlated with the CDT, IADL, and MMSE. The proposed version of the AMTS can distinguish between groups with and without cognitive impairment. Additionally, the AMTS is found to be clinically valid having high reliability and classification accuracy. Conclusively, it is a valuable instrument for screening different types of cognitively impaired patients.

18 January 2024 in Languages
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Journal Article
Open access
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Vasiliki ZarokanellouVasiliki Zarokanellou
Vasiliki Zarokanellou
APAlexandra Prentza
Alexandra Prentza
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
GKGerasimos A. Kolaitis
Gerasimos A. Kolaitis
Katerina PapanikolaouKaterina Papanikolaou
Katerina Papanikolaou
Background: This quasi-experimental comparative group study examined vocabulary knowledge and its associations with other language skills in Greek-speaking children with high-functioning Autism Spectrum Disorder and mild language impairment (HF-ASDLI) and typically developing (TD) peers. Methods: 25 children aged 7–10 years old participated in each group. Groups were matched in age, gender, and non-verbal IQ. Naming and word definition tasks were used to evaluate vocabulary knowledge in both groups. Results: Groups did not differ in the naming task; however, children with HF-ASDLI scored lower in the definition task. Both vocabulary tasks positively correlated with morpho-syntactic and overall language ability in both groups, although a significant positive correlation was detected between vocabulary knowledge and informational competence exclusively in the group with HF-ASDLI. Conclusions: Being in the HF-ASDLI group and having narrative ability significantly predicted participants’ performance in the definitions task, indicating that language impairment better explains vocabulary difficulties. These results agree with findings from the English language.

26 November 2021 in Journal of Clinical and Experimental Neuropsychology
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Journal Article
Closed access
Dionysios TafiadisDionysios Tafiadis
Dionysios Tafiadis
NZNafsika Ziavra
Nafsika Ziavra
APAlexandra Prentza
Alexandra Prentza
VSVassiliki Siafaka
Vassiliki Siafaka
Vasiliki ZarokanellouVasiliki Zarokanellou
Vasiliki Zarokanellou
SKSpiros Konitsiotis
Spiros Konitsiotis
The present study aims to be the first to validate the Tuokko version of the Clock Drawing Test (CDT) and estimate its cutoff score after its translation into the Greek language and administration ...