Dorsolateral prefrontal cortex response to negative tweets relates to executive functioning

Age-based stereotype threat and neuropsychological performance in older adults

The current study investigated the effects of age-based stereotype threat on neuropsychological assessment outcomes in an older adult population. Community volunteers (n = 49) age 65 and older were screened for cognitive impairment, depression, and anticholinergic medication use. Screened individuals were randomly stratified into either an ABST or a Control group. All participants were administered a broad range of neuropsychological measures of cognition as well as a self-rating measure assessing subjective concern about cognitive ability. A main effect of ABST on subjective concern about cognitive ability was supported. Specifically, individuals in the ABST group were significantly more likely to attribute their memory errors to the onset of dementia (F(1,41) = 5.334, p = .026). However, results showed no significant difference between groups on objective neuropsychological performance measures. The current study discusses the importance of considering ABST effects in the context of neuropsychological assessment in older adult populations.

A Systematic Review of Structural and Functional MRI Studies Investigating Social Networking Site Use

An understanding of the neurocognitive profile underlying the use of social networking sites (SNSs) can help inform decisions about the classification of problematic SNS use as an addictive disorder and elucidate how/when 'SNS addiction' might develop. The present review aimed to synthesize structural and functional MRI research investigating problematic/compulsive forms of SNS use or regular (non-addicted) SNS use behaviours. We conducted a systematic search for research articles published in English using the Web of Science, PubMed, and Scopus databases up to October 2022. Studies meeting our inclusion criteria were assessed for quality and a narrative synthesis of the results was conducted. Twenty-eight relevant articles were identified comprising structural MRI (n = 9), resting-state fMRI (n = 6) and task-based fMRI studies (n = 13). Current evidence suggests that problematic SNS use might be characterised by (1) reduced volume of the ventral striatum, amygdala, subgenual anterior cingulate cortex, orbitofrontal cortex and posterior insula; (2) increased ventral striatum and precuneus activity in response to SNS cues; (3) abnormal functional connectivity involving the dorsal attention network; (4) inter-hemispheric communication deficits. Regular SNS use behaviours appear to recruit regions involved in the mentalising network, the self-referential cognition network, the salience network, the reward network and the default mode network. Such findings are at least partially consistent with observations from the substance addiction literature and provide some provisional support for the addictive potential of SNSs. Nonetheless, the present review is limited by the small number of eligible studies and large heterogeneity in the methods employed, and so our conclusions should remain tentative. Moreover, there is a lack of longitudinal evidence suggesting SNSs cause neuroadaptations and thus conclusions that problematic SNS use represents a disease process akin to substance use addictions are premature. More well-powered longitudinal research is needed to establish the neural consequences of excessive and problematic SNS use.