Cognitive flexibility (CF) allows individuals to adapt their behavior to changing environmental demands. As task complexity increases, CF may substantially impact performance by facilitating a shift towards more efficient information processing strategies. However, its role in tasks with high cognitive demands remains largely unexplored. Furthermore, while CF is associated with inhibitory control and working memory functions, their precise relationship under task demands is not yet fully understood. To address this gap, we investigated how CF and inhibition metrics are associated with different levels of mental attentional demand (Md), as well as СF. Additionally, we explored differences in eye-movement indices associated with high and low CF in tasks with varied levels of Md. Analyzing data from 42 young participants performing CF, inhibition, and mental attention tasks with eye movement recording for the last task, we found that multidimensional switching (i.e., switching between three rules) correlated with mental attentional capacity, whereas two-dimensional switching (i.e., switching between two rules) correlated with inhibitory control. Individuals with low and high switching scores differed in task performance and eye-movement patterns of mental attentional demand (i.e., difficulty). Specifically, those with high efficiency in multidimensional switching exhibited superior performance across all levels of mental attentional demand. Further, high-efficiency performers employed eye-movement patterns characterized by an increased number of fixations, shorter fixation durations, and decreased blink rates, with significant differences observed at higher levels of mental-attention demand. Our findings offer new insights into psychophysiological metrics related to higher-order cognitive processes, discussed in terms of cognitive theory and practical significance.
Chuikova et al. (Tue,) studied this question.