Null cross-modal effects of olfactory training on visual, auditory or olfactory working memory in 6- to 9-year-old children.

Systematic exposure to odours (olfactory training, OT) is a method of smell loss treatment. Due to olfactory system projections to prefrontal brain areas, OT has been hypothesized to enhance cognitive functions, but its effects have been studied predominantly in adults. This study tested OT effects on working memory (WM), i.e., the ability to store and manipulate information for a short time, in healthy children aged 6-9 years. We expected OT to improve olfactory WM and establish cross-modal transfer to visual and auditory WM. Participants performed 12 weeks of bi-daily OT with either 4 odours (lemon, eucalyptus, rose, cloves; OT group) or odourless propylene glycol (placebo group). Pre- and post-training, participants' WM was measured utilizing odours (olfactory WM) or pictures (visual WM) and a word-span task (auditory WM). 84 children (40 girls) completed the study. The analyses revealed no changes in the WM performance following OT. The olfactory WM task was the most difficult for children, highlighting the need to include olfactory-related tasks in educational programmes to improve children's odour knowledge and memory, just as they learn about sounds and pictures. Further neuroimaging research is needed to fully understand the impact of OT on cognitive functions in children.

Distress Tolerance is Indirectly Related to Nicotine Use through the Smoking Motives.

BACKGROUND AND OBJECTIVES: Previous research has shown that low ability to tolerate distress is indirectly related to problematic substance use through the substance use motives. This topic has been previously researched in alcohol and cannabis use; however, it has not yet been explored in tobacco use. We studied whether distress tolerance is indirectly associated with nicotine dependence through motives of tension reduction and habitual smoking. DESIGN AND METHODS: A total sample of 451 (230 of which were women) daily and occasional Polish smokers (aged from 18 to 60 years) reported distress tolerance, motives for smoking, and nicotine dependence. We then conducted a mediation analysis with bootstrapping using PROCESS macro. RESULTS: Distress tolerance was indirectly related to nicotine dependence through both motives independently. In terms of the sequential model, there was a significant indirect effect of distress tolerance on nicotine dependence through smoking motives: tension reduction and habit. The total effect of distress tolerance on nicotine dependence was insignificant. CONCLUSIONS: Our findings suggest that individuals with low distress tolerance are especially prone to nicotine dependence if they use smoking as a coping mechanism and it becomes habitual. The current study highlights the importance of a multidimensional approach in dealing with nicotine dependence.

The Importance of Intact Senses in Mating and Social Assessments Made by Deaf Individuals.

Social perception is a multimodal process involving vision and audition as central input sources for human social cognitive processes. However, it remains unclear how profoundly deaf people assess others in the context of mating and social interaction. The current study explored the relative importance of different sensory modalities (vision, smell, and touch) in assessments of opposite- and same-sex strangers. We focused on potential sensory compensation processes in mate selection (i.e., increased importance of the intact senses in forming impressions of an opposite-sex stranger as a potential partner). A total of 74 deaf individuals and 100 normally hearing controls were included in the study sample. We found diminished importance of vision and smell in deaf participants compared with controls for opposite- and same-sex strangers, and increased importance of touch for the assessment of same-sex strangers. The results suggested that deaf people rely less on visual and olfactory cues in mating and social assessments, highlighting a possible role of sign language in shaping interpersonal tactile experience in non-romantic relationships.