ABSTRACT
Background and purpose: Long-COVID describes the long-term effects of the coronavirus disease 2019 (COVID-19). In long-COVID patients, neuropsychological alterations are frequently reported symptoms. Research points to medial temporal lobe dysfunction and its association with anosmia in long-COVID patients. This study aims to investigate the acquisition and consolidation of declarative and procedural memory in long-COVID patients and to explore whether anosmia is related to these dissociated memory functions. Methods: Forty-two long-COVID participants and 30 controls (C) were recruited. The sample of long-COVID patients was divided into two groups based on the presence or absence of anosmia, group A and group NA, respectively. Objective performance in verbal declarative memory (Paired-Associate Learning, PAL), procedural memory (Mirror Tracing Test, MTT), general cognitive function (Montreal Cognitive Assessment scale), psychomotor speed, and incidental learning (Digit Symbol Substitution Test) were assessed and compared among the A, NA, and C groups. Long-term retention of PAL and MTT were assessed 24 h after acquisition. Results: Lower scores in general cognition, psychomotor speed, and sustained attention were found in A and NA compared with C. However, incidental learning, both cue-guided and free-recalled, was diminished in group A compared with C, with no differences with group NA. General cognition and incidental learning were related to declarative memory function exclusively in long-COVID groups. Long-COVID groups presented lower long-term retention of verbal declarative memory than controls in recall tests but no differences in recognition tests. No group differences were found in the acquisition of procedural memory. However, long-term retention of this memory was worse in group A as compared to the NA and C groups, respectively, when errors and time of execution were considered. Conclusion: Findings support that consolidation of both procedural and declarative memories is more affected than the acquisition of these memories in long-COVID patients, who are also more vulnerable to deficits in delayed recall than in recognition of declarative memories. Deficits in the consolidation of procedural memory and immediate recall of declarative information are especially relevant in long-COVID participants with anosmia. This indicates that anosmia in COVID-19 could be associated with a long-term dysfunction of the limbic system.
ABSTRACT
The use of digital games has increased dramatically in the last two decades due to the augmentation in the number of Personal Computers (PCs) and mobile devices worldwide. Not only can digital games be played for entertainment, but also, they may have both positive and negative effects on their players. Various effects of digital games on individuals’ levels of attention span, concentration, and addiction have already been tested by numerous studies;however, their impact on incidental Second Language (L2) acquisition is still untouched by language researchers. To address this lacuna, this is a longitudinal observational study that lasted for three months to investigate the impact of digital games played by young learners for entertainment at home on their unintentional acquisition of English as an L2. The age of the participants ranged from 8 to 14 years old, and the experiment was conducted during the Covid-19 pandemic in 2021. Three main games were played by the sample;namely, Free Fire, Minecraft, and Among Us. The findings revealed that digital gaming significantly influenced the vocabulary development of the participants, and gaming was a clear asset for their L2 acquisition. It was also found that the players’ level of vocabulary retention was high;however, two drawbacks were identified in this regard, namely, the prolonged screen time and vocabulary items specifically related to a given area of a particular game. Overall, this study can be an impetus for further research into evaluating the benefits or drawbacks of using digital games for specific aspects of L2 acquisition such as the development of cognitive abilities or enhanced understanding. © 2022 The Authors. Published by University of Isfahan.