Detecting late talkers among children is important because they are at greater risk of subsequently manifesting persistent disorders in language development. Therefore, it would be beneficial to have quick measurement tools with adequate psychometric properties, which have not yet been developed. This study set out to develop, analyse and validate the factor structure of an observational scale for detecting Late Language Emergence (LLE) in Spanish-speaking children aged 2-3 years that could be applied not only by language professionals but also teachers in early childhood education centres for children aged 0-3 years.

Developing assessments in multiple languages is hugely complex, impacting every stage from test development to scoring, and evaluating scores. Different approaches are needed to examine comparability and enhance validity in cross-lingual assessments. Method: A review of literature and practices relating to different methods used in cross-lingual assessment is presented. Results: There has been a shift from source-to-target language translation to developing items in multiple languages simultaneously. Quantitative and qualitative methods are used to link and evaluate assessments across languages and provide validity evidence. Conclusions: This article provides practitioners with an overview and research-based recommendations relating to test development, linking, and validation of assessments produced in multiple languages.

Age-related cognitive decline is rising due to longer life expectancy, necessitating new treatments as current drugs are ineffective and costly. Transcranial alternating current stimulation at the theta frequency (theta-tACS) has shown promise in enhancing cognitive function in both young and elderly adults, but its effectiveness in those with cognitive decline is not well-studied. Method: This study involved 27 participants with subjective cognitive decline (SCD), mild cognitive impairment (MCI), and dementia, who underwent multiple sessions combining computerized cognitive training with theta-tACS to assess its efficacy. Participants were randomly assigned to either a real-tACS or sham-tACS group. Before and after treatment, they completed several cognitive tasks, and their behavioral and EEG data were collected. Results: Only the real-tACS group improved in the oddball task and exhibited increased event-related EEG amplitude in the theta range. Conclusions: These findings suggest that theta-tACS can improve cognitive performance in individuals with cognitive decline at both behavioral and psychophysiological levels, supporting its potential for alleviating cognitive decline in elderly populations.