A closer look at the relationship between the default network,mind wandering,negative mood,and depression

By a systematic analysis of the current literature on the neural correlates of mind wandering, that is, the default network (DN), and by shedding light on some determinative factors and conditions which affect the relationship between mind wandering and negative mood, we show that (1) mind wandering per se does not necessarily have a positive correlation with negative mood and, on the higher levels, depression. We propose that negative mood as a consequence of mind wandering generally depends on two determinative conditions, that is, whether mind wandering is with or without meta-awareness and whether mind wandering occurs during high or low vigilance states; (2) increased activity of the DN is not necessarily followed by an increase in unhappiness and depression. We argue that while in some kinds of meditation practices we witness an increase in the structure and in the activity of the DN, no increase in unhappiness and depression is observed.     

The dynamic framework of mind wandering revisited: How mindful meta-awareness affects mental states’ constraints

The dynamic framework of mind wandering (Christoff, Irving, Fox, Spreng, & Andrews-Hanna, 2016) is reviewed and modified through integrating the construct of mindful meta-awareness. The dynamic framework maintains that mind wandering belongs to a family of spontaneous thought phenomena. The key defining feature of mind wandering is ‘spontaneity’ which characterizes the dynamic nature of thoughts in the framework. The argument is made that incorporating the mindful meta-awareness construct modifies the dynamic framework as follows: (1) the framework’s criteria for mind wandering do not hold anymore as meta-awareness changes the relationship between thoughts and constraints, and (2) lucid dreaming can be categorized as unguided thought while at the same time being dependent on deliberate constraints. Finally, the application of this modified framework will be discussed in terms of the treatment of mental disorders related to spontaneous thought alterations, in particular depression and nightmares.     

Phenomenal consciousness in dreams and in mind wandering

Dreaming can be explained as the product of an interaction among memory processes, elaborative processes, and phenomenal awareness. A feedback circuit is activated by this interaction according to the associative links and the requirements of the dream scene. Recently, it has been hypothesized that a partial similarity exists between dreaming and mind wandering and that these two processes may involve the same neural default network. This commentary discusses the differences and similarities between phenomenal consciousness during dreaming and phenomenal consciousness during mind wandering from the perspective of the “continuity” of engagement of cognitive systems. The greatest difference consists in the lack of reality testing during dreaming. Dream imagery is hallucinatory by nature. Consequently, the simulated world in dreams makes dream imagery more akin to perception. In contrast, the imagery of mind wandering is more similar to imagination. The level of meta-awareness is preserved more frequently and to a greater degree in mind wandering.     

Your mind wanders weakly, your mind wanders deeply: Objective measures reveal mindless reading at different levels

When the mind wanders, attention turns away from the external environment and cognitive processing is decoupled from perceptual information. Mind wandering is usually treated as a dichotomy (dichotomy-hypothesis), and is often measured using self-reports. Here, we propose the levels of inattention hypothesis, which postulates attentional decoupling to graded degrees at different hierarchical levels of cognitive processing. To measure graded levels of attentional decoupling during reading we introduce the sustained attention to stimulus task (SAST), which is based on psychophysics of error detection. Under experimental conditions likely to induce mind wandering, we found that subjects were less likely to notice errors that required high-level processing for their detection as opposed to errors that only required low-level processing. Eye tracking revealed that before errors were overlooked influences of high- and low-level linguistic variables on eye fixations were reduced in a graded fashion, indicating episodes of mindless reading at weak and deep levels. Individual fixation durations predicted overlooking of lexical errors 5s before they occurred. Our findings support the levels of inattention hypothesis and suggest that different levels of mindless reading can be measured behaviorally in the SAST. Using eye tracking to detect mind wandering online represents a promising approach for the development of new techniques to study mind wandering and to ameliorate its negative consequences.     

Intentionality and meta-awareness of mind wandering: Are they one and the same,or distinct dimensions?

Researchers have recently demonstrated that mind-wandering episodes can vary on numerous dimensions, and it has been suggested that assessing these dimensions will play an important role in our understanding of mind wandering. One dimension that has received considerable attention in recent work is the intentionality of mind wandering. Although it has been claimed that indexing the intentionality of mind wandering will be necessary if researchers are to obtain a coherent understanding of the wandering mind, one concern is that this dimension might be redundant with another, longstanding, dimension: namely, meta-awareness. Thus, the utility of the argument for assessing intentionality rests upon a demonstration that this dimension is distinct from the meta-awareness dimension. To shed light on this issue, across two studies we compared and contrasted these dimensions to determine whether they are redundant or distinct. In both studies, we found support for the view that these dimensions are distinct.     

Priming honesty reduces subjective bias in self-report measures of mind wandering

Using self-report as a measure of conscious experience has been a point of contention in mind wandering research. Whereas prior work has focused on the introspective component of self-report validity, the current research introduces an honesty prime task to the current paradigm in order to assess the role of goal states and social factors on self-report accuracy. Findings provide evidence for an inflated report of mind wandering frequency arising from demand characteristics, intensified by the divergent properties of the subjective and behavioural measures and the general deficit in meta-awareness of off task episodes.     

Absorbed in thought: the effect of mind wandering on the processing of relevant and irrelevant events

This study used event-related potentials to explore whether mind wandering (task-unrelated thought, or TUT) emerges through general problems in distraction, deficits of task-relevant processing (the executive-function view), or a general reduction in attention to external events regardless of their relevance (the decoupling hypothesis). Twenty-five participants performed a visual oddball task, in which they were required to differentiate between a rare target stimulus (to measure task-relevant processes), a rare novel stimulus (to measure distractor processing), and a frequent nontarget stimulus. TUT was measured immediately following task performance using a validated retrospective measure. High levels of TUT were associated with a reduction in cortical processing of task-relevant events and distractor stimuli. These data contradict the suggestion that mind wandering is associated with distraction problems or specific deficits in task-relevant processes. Instead, the data are consistent with the decoupling hypothesis: that TUT dampens the processing of sensory information irrespective of that information's task relevance.     

Motivating meta-awareness of mind wandering: A way to catch the mind in flight?

Given the negative effects of mind wandering on performance, it may be profitable to be aware of task-unrelated thoughts (TUTs) as they occur. The present study investigated whether motivating people to catch TUTs increases meta-awareness. We offered incentives for increased self-catching during reading. To enhance the veracity of these self-reports, we used a “bogus-pipeline” procedure; we convinced participants that their mental states were being covertly monitored using physiological measures. In reality, mind wandering was assessed covertly by a secondary task (“gibberish detection”), and overtly by experience sampling. The results showed that incentives increased the number of self-catches without increasing overall mind wandering. Moreover, both the bogus pipeline and the opportunity for incentives increased the validity of self-reports, evidenced by significantly increased correlations between self-caught and behaviorally assessed mind wandering. We discuss the relevance of this methodological approach for research on mind wandering and research building on introspective reports more generally.     

The lights are on but no one’s home: Meta-awareness and the decoupling of attention when the mind wanders

In a recent review, we suggested that an important aspect of mind-wandering is whether participants are aware that they are off task (Smallwood & Schooler, 2006). We tested this hypothesis by examining the informationprocessing correlates of mind wandering with and without awareness in a task requiring participants to encode words and detect targets with either a high or a low probability. Target detection was measured via response inhibition. Mind wandering in the absence of awareness was associated with a failure to supervise task performance, as indicated by short RTs, and was predictive of failures in response inhibition. Under conditions of low target probability, mind wandering was associated with a relative absence of the influence of recollection at retrieval. The results are consistent with the notion that mind wandering involves a state of decoupled attention and emphasizes the importance of meta-awareness of off-task episodes in determining the consequences of these mental states.     

Researching mind wandering from a first‐person perspective

Mind wandering is an inherently inner (or first‐person) phenomenon that leaves few direct traces for third‐person enquiry. Nonetheless, psychologists often study mind wandering using third‐person (e.g., behavioral or neuronal) research methods. And although research–participants may well be asked to introspect on their mind wandering experiences (e.g., via experience‐sampling or think‐aloud techniques), such introspective self‐observations typically lack methodological rigor and are hence of only preliminary value. Here, we argue that it is a missed opportunity to not train researchers to introspect on their own mind‐wandering experiences to better understand the associated mental processes. We propose a novel approach to cultivating an educated form of introspection in the study of attentional focusing and mind wandering. Our research adds to the current theoretical understanding by explicating conditions that facilitate mind wandering (e.g., the shifting and broadening of concepts) and help find the way back to the primary task (e.g., commitment; deliberate shifts between focusing and defocusing).     

The restless mind

This article reviews the hypothesis that mind wandering can be integrated into executive models of attention. Evidence suggests that mind wandering shares many similarities with traditional notions of executive control. When mind wandering occurs, the executive components of attention appear to shift away from the primary task, leading to failures in task performance and superficial representations of the external environment. One challenge for incorporating mind wandering into standard executive models is that it often occurs in the absence of explicit intention--a hallmark of controlled processing. However, mind wandering, like other goal-related processes, can be engaged without explicit awareness; thus, mind wandering can be seen as a goal-driven process, albeit one that is not directed toward the primary task.     

毅力与学业成绩的关系：有意走神和自发走神的不同中介作用

以3372名5年级小学生为研究对象,采用毅力量表、有意走神和自发走神量表以及学业成绩测验,考察毅力（兴趣一致性和坚持努力）对学业成绩的影响,并检验有意走神和自发走神的中介作用。结果发现：（1）兴趣一致性和坚持努力均显著正向预测学业成绩;（2）有意走神、自发走神在兴趣一致性和坚持努力与学业成绩之间均起显著的中介作用,但两者的中介作用模式存在差异。有意走神在兴趣一致性和坚持努力与学业成绩间的中介作用不同：兴趣一致性负向影响有意走神,有意走神正向影响学业成绩,坚持努力正向影响有意走神,有意走神正向影响学业成绩;而自发走神在兴趣一致性和坚持努力对学业成绩预测的中介作用相同,即兴趣一致性和坚持努力均负向影响自发走神,自发走神负向影响学业成绩。     

走神的理论假设、影响因素及其神经机制

围绕“为什么会走神”这一问题, 文章首先介绍了走神的两个理论假设：解耦合假设和执行控制失败假设。接着论述了影响走神的各种因素, 并探讨了走神的神经机制。最后指出未来研究应着眼于走神的潜在功能来发展理论假设; 整合影响走神的各种因素到一个模型中, 从而更好地发现各因素对走神的综合影响; 应用同步脑电和功能磁共振成像技术以更精确地探索走神的神经机制。此外, 对特殊群体的走神研究以及走神的跨文化研究也是很有必要的。     

Counting the cost of an absent mind: Mind wandering as an underrecognized influence on educational performance

Successful learning requires that individuals integrate information from the external environment with their own internal representations. In this article, we consider the role that mind wandering plays in education. Mind wandering represents a state of decoupled attention because, instead of processing information from the external environment, our attention is directed toward our own private thoughts and feelings. In principle, because mind wandering is a state of decoupled attention, it represents a fundamental breakdown in the individual’s ability to attend (and therefore integrate) information from the external environment. We consider evidence that mind wandering impairs the encoding of information, leading to failures in building a propositional model of a sentence and, ultimately, impairing the building of a narrative model with sufficient detail to allow generating inferences. Next, because recognizing and correcting for mind wandering is a metacognitive skill, certain client groups, such as those suffering from dysphoria or attention deficit disorder, may be unable to correct for the deficits associated with mind wandering, and so may suffer greater negative consequences during education. Finally, we consider how to apply this research to educational settings.     

Mind wandering while reading easy and difficult texts

Mind wandering is a phenomenon in which attention drifts away from the primary task to task-unrelated thoughts. Previous studies have used self-report methods to measure the frequency of mind wandering and its effects on task performance. Many of these studies have investigated mind wandering in simple perceptual and memory tasks, such as recognition memory, sustained attention, and choice reaction time tasks. Manipulations of task difficulty have revealed that mind wandering occurs more frequently in easy than in difficult conditions, but that it has a greater negative impact on performance in the difficult conditions. The goal of this study was to examine the relation between mind wandering and task difficulty in a high-level cognitive task, namely reading comprehension of standardized texts. We hypothesized that reading comprehension may yield a different relation between mind wandering and task difficulty than has been observed previously. Participants read easy or difficult versions of eight passages and then answered comprehension questions after reading each of the passages. Mind wandering was reported using the probe-caught method from several previous studies. In contrast to the previous results, but consistent with our hypothesis, mind wandering occurred more frequently when participants read difficult rather than easy texts. However, mind wandering had a more negative influence on comprehension for the difficult texts, which is consistent with the previous data. The results are interpreted from the perspectives of the executive-resources and control-failure theories of mind wandering, as well as with regard to situation models of text comprehension.     

Tracking arousal state and mind wandering with pupillometry

In four experiments, the association between arousal state and different mind-wandering states was examined. Participants performed a sustained attention task while pupil responses were continuously recorded. Periodically during the task, participants were presented with thought probes to determine if they were on task or mind wandering. Across the four experiments, the results suggested that in situations that promoted on-task behaviors and focused external attention, mind wandering was associated with lowered arousal, as seen by smaller tonic pupil diameters and smaller phasic pupillary responses. However, in situations that promoted a more internal focus of attention, there were no differences between on-task states and mind wandering in tonic pupil diameter (although differences emerged for phasic pupillary responses), suggesting similar arousal levels. Furthermore, across the four experiments, mind blanking and mind wandering dissociated in terms of whether the situation promoted focused external attention or focused internal attention. These results are broadly consistent with the notion that mind wandering is a heterogeneous construct, with different forms of mind wandering being associated with different arousal states, and suggest that a combination of behavioral and pupillary measures can be used to track these various states.     

自发走神和有意走神及其与元认知的关系

走神包括有意走神和自发走神两种类型,元认知对二者的影响可能不同。研究使用两维度走神量表和元认知-30量表,对国内部分高校学生的走神和元认知(元认知信念、元认知加工和认知自信判断)进行调查,结果显示:(1)走神可以划分为有意走神和自发走神;(2)失控和危险感既能预测自发走神也能预测有意走神,但认知自信只能预测自发走神,认知的自我意识只能预测有意走神。说明元认知对自发走神和有意走神的影响存在差异。     

Unnoticed intrusions: Dissociations of meta-consciousness in thought suppression

The current research investigates the interaction between thought suppression and individuals’ explicit awareness of their thoughts. Participants in three experiments attempted to suppress thoughts of a prior romantic relationship and their success at doing so was measured using a combination of self-catching and experience-sampling. In addition to thoughts that individuals spontaneously noticed, individuals were frequently caught engaging in thoughts of their previous partner at experience-sampling probes. Furthermore, probe-caught thoughts were: (i) associated with stronger decoupling of attention from the environment, (ii) more likely to occur under cognitive load, (iii) more frequent for individuals with a desire to reconcile, and (iv) associated with individual differences in the tendency to suppress thoughts. Together, these data suggest that individuals can lack meta-awareness that they have begun to think about a topic they are attempting to suppress, providing novel insight into the cognitive processes that are involved in attempting to control undesired mental states.     

For whom the mind wanders, and when: an experience-sampling study of working memory and executive control in daily life

An experience-sampling study of 124 undergraduates, pretested on complex memory-span tasks, examined the relation between working memory capacity (WMC) and the experience of mind wandering in daily life. Over 7 days, personal digital assistants signaled subjects eight times daily to report immediately whether their thoughts had wandered from their current activity, and to describe their psychological and physical context. WMC moderated the relation between mind wandering and activities' cognitive demand. During challenging activities requiring concentration and effort, higher-WMC subjects maintained on-task thoughts better, and mind-wandered less, than did lower-WMC subjects. The results were therefore consistent with theories of WMC emphasizing the role of executive attention and control processes in determining individual differences and their cognitive consequences.     

Working Memory Capacity Offers Resistance to Mind‐Wandering and External Distraction in a Context‐Specific Manner

The present study examined the impact of mind‐wandering and distraction in silent and noisy studying environments and how individual differences in working memory capacity offered resistance to these two distinct forms of attention failure. Two groups of participants read a text in different environments and answered reading comprehension questions. While reading, thought probes asked participants to indicate the current focus of their attention. Results showed that the relationship between working memory capacity and reading comprehension was partially driven by resistance to mind‐wandering in the silent condition and by resistance to external distraction in the noise condition. The findings support the distinction between mind‐wandering and external distraction, two separate yet related types of attention failure that impact task performance. Further, executive abilities seem to offer resistance to these two types of attention failure differentially depending on the context. Copyright © 2015 John Wiley & Sons, Ltd.