No abstract

Periods of persistent and intensive demands may compromise working memory (WM) and increase susceptibility to distraction. We investigated if mindfulness training (MT) may mitigate these deleterious effects and promote cognitive resilience in military cohorts enduring a high-demand interval of military training. To better understand which aspects of MT programs are most beneficial, three military cohorts were examined. Two groups received 8-h variants of an MT course, Mindfulness-based Mind Fitness Training (MMFT)®, with one group emphasizing in-class training exercises (M8T, n = 40) and the other emphasizing didactic content (M8D, n = 40). A third group received no training (NTC, n = 46). Performance on a delayed-recognition WM task that varied mnemonic load (1 vs. 2 items) and delayspanning valenced distraction (negative vs. neutral images) was measured before (T1) and after (T2) an 8-week interval. Overall, task accuracy (% correct) was greater on low-vs. high-load trials, as well as trials with neutral vs. negative distraction. Task accuracy did not change over time in a civilian cohort (N = 22). Yet, it declined from T1 to T2 in the military cohorts, with the greatest degradation in NTC, followed by M8D, and near stable performance from T1 to T2 in M8T. This time by group effect significantly varied with load, but not with distracter valence. While NTC's performance degraded over time for both low-and high-load trials, M8D's performance degraded only for high load, and M8T did not show performance degradation for either load condition. These results suggest that MT may protect against WM degradation over high-demand intervals, with training-focused MT programs offering the greatest benefits for maintaining performance in high-load conditions.

The aim of this study was to examine the prevalence and clinical correlates of explosive outbursts in two large samples of individuals with TS, including one collected primarily from non-clinical sources. Participants included 218 TS-affected individuals who were part of a genetic study (N=104 from Costa Rica (CR) and N=114 from the US). The relationship between explosive outbursts and comorbid attention deficit hyperactivity disorder (ADHD), obsessive compulsive disorder (OCD), tic severity, and prenatal and perinatal complications were examined using regression analyses. Twenty percent of participants had explosive outbursts, with no significant differences in prevalence between the CR (non-clinical) and the US (primarily clinical) samples. In the overall sample, ADHD, greater tic severity, and lower age of tic onset were strongly associated with explosive outbursts. ADHD, prenatal exposure to tobacco, and male gender were significantly associated with explosive outbursts in the US sample. Lower age of onset and greater severity of tics were significantly associated with explosive outbursts in the CR sample. This study confirms previous studies that suggest that clinically significant explosive outbursts are common in TS and associated with ADHD and tic severity. An additional potential risk factor, prenatal exposure to tobacco, was also identified.

Experience sampling of attentional states has consistently demonstrated that mind wandering is a frequent and disruptive obstacle when one must sustain attention during continuous task performance. Yet, methods commonly used to assess the subjective experience of mind wandering may conflate several potential sources of meaningful variation in individuals' degree of task engagement. In the present study, we examined evidence for distinct and identifiable patterns in subjective reports of the degree of task-related attentional focus during a sustained attention task in a large sample of adults (N = 537). Experience sampling probes embedded in the task assessed task-related focus using a continuum of response ratings ranging from 1 (on-task) to 6 (off-task). Participants used a range of probe response options in categorizing their current attentional state, and the continuum of probe ratings differentiated patterns of behavioral performance in the moments preceding probes. Markov-chain modeling of the categorical time series sequence of probe ratings further revealed distinct and behaviorally relevant hidden states underlying probe rating behavior. We replicated these findings in two additional independent data sets. Collectively, these findings suggest that three or more hidden attentional states best account for subjective ratings of taskrelated focus. The implications of these findings for models of sustained attention and mind wandering are discussed.

Cognitive control, which allows for the selection and monitoring of goal-relevant behavior, is dynamically upregulated on the basis of moment-to-moment cognitive demands. One route by which these demands are registered by cognitive control systems is via the detection of response conflict. Yet working memory (WM) demands may similarly signal dynamic adjustments in cognitive control. In a delayed-recognition WM task, Jha and Kiyonaga (Journal of Experimental Psychology: Learning, Memory, & Cognition, 36(4), 1036-1042, 2010) demonstrated dynamic adjustments in cognitive control via manipulations of mnemonic load and delay-spanning cognitive interference. In the present study, we aimed to extend prior work by investigating whether affective interference may similarly upregulate cognitive control. In Experiment 1, participants (N = 89) completed a delayed-recognition WM task in which mnemonic load (memory load of one vs. two items) and delay-spanning affective interference (neutral vs. negative distractors) were manipulated in a factorial design. Consistent with Jha and Kiyonaga, the present results revealed that mnemonic load led to dynamic adjustments in cognitive control, as reflected by greater performance on trials preceded by high than by low load. In addition, we observed that affective interference could trigger dynamic adjustments in cognitive control, as evinced by higher performance on trials preceded by negative than by neutral distractors. These findings were subsequently confirmed in Experiment 2, which was a pre-registered replication study (N = 100). Thus, these results suggest that in addition to dynamic adjustments as a function of mnemonic load, affective interference, similar to cognitive interference (

Experience sampling of attentional states has consistently demonstrated that mind wandering is a frequent and disruptive obstacle when one must sustain attention during continuous task performance. Yet, methods commonly used to assess the subjective experience of mind wandering may conflate several potential sources of meaningful variation in individuals’ degree of task engagement. In the present study, we examined evidence for distinct and identifiable patterns in subjective reports of the degree of task-related attentional focus during a sustained attention task in a large sample of adults (N = 537). Experience sampling probes embedded in the task assessed task-related focus using a continuum of response ratings ranging from 1 (on-task) to 6 (off-task). Participants used a range of probe response options in categorizing their current attentional state, and the continuum of probe ratings differentiated patterns of behavioral performance in the moments preceding probes. Markov-chain modeling of the categorical time series sequence of probe ratings further revealed distinct and behaviorally relevant hidden states underlying probe rating behavior. We replicated these findings in two additional independent data sets. Collectively, these findings suggest that three or more hidden attentional states best account for subjective ratings of task-related focus. The implications of these findings for models of sustained attention and mind wandering are discussed.

Capacity-limited working memory (WM) systems have been known to degrade in older age. In line with inhibition-deficit theories of aging, WM deficits in older individuals have been attributed to failures in the ability to suppress the processing of task irrelevant, distracting information. Yet, other cognitive mechanisms underlying age-related WM deficits have been observed, including failures in WM with increasing memory load. Moreover, both distracting information and high memory load have been shown to trigger adjustments in cognitive control leading to subsequent performance benefits on later trials. However, no studies have characterized these dynamic adjustments across the life span or examined their contribution to WM deficits in older adults. We investigated the contribution of distracter interference, memory load, and dynamic adjustments in cognitive control on WM performance in 505 individuals with ages ranging from adolescence to older adulthood. Distracter interference and memory load were parametrically manipulated (high vs. low) in a delayed-recognition WM task, and accuracy was examined as a function of current (N) and previous (N-1) trial demands. Curvilinear models revealed that performance differs over the life span depending on specific WM task demands. Specifically, the ability to suppress task irrelevant distracters was greater in adulthood compared with adolescence, but worse in later life. In contrast, memory load resulted in performance deficits with increasing age, which were exacerbated when high load and interference demands combined. Dynamic adjustments in cognitive control was spared, in part, with memory-load triggered sequential trial effects maintained across the life span, but interference-triggered benefits observable up to middle age.

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