The study investigates the ability of Greek-speaking individuals diagnosed with mild Alzheimer's Disease (mAD) and Mild Cognitive Impairment (MCI) to produce verbs that vary with respect to their grammatical and lexical aspect. While grammatical aspect has been examined in aphasia, there are only a few studies dealing with this in neurodegenerative conditions and their findings are contradictory. Motivated by this, we further investigate aspect by examining not only grammatical but lexical aspect as well and how their semantic and temporal features affect mAD and MCI individuals' performance. Thus, the major innovation of the study is that it examines aspect not only as a functional feature but also as a lexical variable, something addressed for the first time in the literature. We also address whether grammatical aspect interacts with lexical aspect and with time reference. Finally, by looking at Greek, we further contribute to cross-linguistic perspective of aspect investigation. 11 MCI and 11 mAD individuals participated in a picture naming task, targeting the investigation of lexical aspect, and a sentence completion task, targeting the investigation of grammatical aspect and its interaction with lexical aspect and time reference. Both groups of participants were found to be impaired in both tasks when compared to healthy controls. In the naming task, both group and lexical aspect were significant predictors for participants' performance. Specifically, more impaired performance was found in states (believe), achievements (break), and semelfactives (hit) compared to activities (run) and accomplishments (build) for both AD and MCI participants. In the sentence completion task, apart from group, neither grammatical or lexical aspect nor tense were significant predictors for participants' performance. While results indicate that both grammatical and lexical aspect are impaired in AD and MCI, a closer look suggests a dissociation regarding the temporal feature of duration. Specifically, as grammatical feature, duration does not appear to affect participants' choice between perfective and imperfective aspect. As a lexical variable, on the other hand, and as part of the lexical representation of a verb, duration (together with internal structure) appears to play a role in verb naming. Finally, the lack of interaction between lexical and grammatical aspect also indicates that these two subsystems can be affected differentially.
Έχει πολύ μεγάλη σημασία η ραδιογεωλογική μελέτη του υποβάθρου, ιδιαίτερα όταν συνδέεται με την ποιότητα ζωής των ανθρώπων, όπως την ραδιοπροστασία από την εκπομπή των ακτινοβολιών α, β, γ, και την αντισεισμική θωράκιση από ρήγματα, που συνδέονται με διάφορα βάθη του υποβάθρου.Στην παρούσα εργασία εκτός από τα ραδιογεωλογικά στοιχεία με τα οποία τεκμηριώνεται ο μηδενικός ραδιολογικός κίνδυνος από τη χαμηλή εκπομπή των ακτινοβολιών α, β και γ του εδάφους, παρουσιάζεται και ο εντοπισμός μια δομής ραδονίου με «σχετικά» υψηλές συγκεντρώσεις (από 2.900-4.137Bq/cm3), που συνδέεται με ρήγμα μικρού βάθους του υποβάθρου.Η δομή του ραδονίου έχει ΒΒΑ-ΝΝΑκή διεύθυνση, διατάσεις 750Χ250m,και βρίσκεται 500m περίπου δυτικά από το σχολείο μας. Οι «σχετικά» υψηλές συγκεντρώσεις ραδονίου της δομήςδεν μπορεί να προέρχονται από τους τοπικούς γεωλογικούς σχηματισμούς, παρά μόνο από τους«σχετικά» βαθύτερους ορίζοντες του υποβάθρου, δια μέσω ενός ρήγματος το οποίο δεν φθάνει μέχρι την επιφάνεια του εδάφους, διότι είναι καλυμμένο με Μειοκαινικά ιζήματα του όρους Πεντέλη. Επομένως το ρήγμα είναι μη ορατό, χαμηλής τάξεως (3ης, 4ης, κλπ.,), λόγω της υποδεέστερης δομής ραδονίου <5.000Bq/cm3 με την οποία συνδέεται και άρα χαμηλής σεισμικής επικινδυνότητας.
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