Mindfulness and Cognitive Control: Examining the Convergence of Two Constructs

Abstract

Mindfulness and cognitive control are overlapping constructs. Mindfulness involves maintaining awareness of the current experience by sustaining attention to relevant information and disengaging from irrelevant information. Cognitive control refers to the set of processes involved in selecting and monitoring information relevant to our goals, while ignoring or inhibiting information irrelevant to these goals. This dissertation contains three studies that examine the convergence between mindfulness and cognitive control. The first study examined the relationship between self-reported mindfulness and behavioural correlates of cognitive control using the Digit Stroop task within two experimental contexts: when task difficulty was not manipulated (non-titrated) and when task difficulty was increased (titrated). The results demonstrate that self-reported mindfulness predicted behavioural performance, but only when cognitive control processes were sufficiently challenged by increasing task difficulty. The second study examined the precise neural mechanisms underlying the relationship between mindfulness and cognitive control using electroencephalography (EEG) to identify changes to event-related potentials (ERPs) during the non-titrated Digit Stroop task after two weeks of daily training. By introducing a novel active control training condition (guided visual imagery meditation) that contrasted passive attention regulation with the focused attention regulation in mindfulness, the results isolated electrophysiological correlates of cognitive control that were uniquely tied to mindfulness training, including increased efficiency in conflict detection, delayed attentional capture by incongruent stimuli, faster conscious evaluation of all stimuli, and delayed automatic detection of all errors. The third study replicated and extended these findings by examining changes to ERPs when the cognitive control system was challenged using the titrated Digit Stroop task. Compared to the active control group, the mindfulness group showed enhanced sensory processing, resistance to stimulus-driven attentional capture and faster conscious evaluation of all stimuli after training. Taken together, this dissertation establishes an empirical relationship between behavioural and electrophysiological correlates of mindfulness and cognitive control.