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We investigated the top-down influence of working memory (WM) maintenance on feedforward perceptual processing within occipito-temporal face processing structures. During event-related potential (ERP) recordings, subjects performed a delayed-recognition task requiring WM maintenance of faces or houses. The face-sensitive N170 component elicited by delay-spanning task-irrelevant grayscale noise probes was examined. If early feedforward perceptual activity is biased by maintenance requirements, the N170 ERP component elicited by probes should have a greater N170 amplitude response during face relative to house WM trials. Consistent with this prediction, N170 elicited by probes presented at the beginning, middle, and end of the delay interval was greater in amplitude during face relative to house WM. Thus, these results suggest that WM maintenance demands may modulate early feedforward perceptual processing for the entirety of the delay duration. We argue based on these results that temporally early biasing of domain-specific perceptual processing may be a critical mechanism by which WM maintenance is achieved.
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We present a new tensor-based morphometric framework that quantifies cortical shape variations using a local area element. The local area element is computed from the Riemannian metric tensors, which are obtained from the smooth functional parametrization of a cortical mesh. For the smooth parametrization, we have developed a novel weighted spherical harmonic (SPHARM) representation, which generalizes the traditional SPHARM as a special case. For a specific choice of weights, the weighted-SPHARM is shown to be the least squares approximation to the solution of an isotropic heat diffusion on a unit sphere. The main aims of this paper are to present the weighted-SPHARM and to show how it can be used in the tensor-based morphometry. As an illustration, the methodology has been applied in the problem of detecting abnormal cortical regions in the group of high functioning autistic subjects.
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BACKGROUND: EEG alpha power has been demonstrated to be inversely related to mental activity and has subsequently been used as an indirect measure of brain activation. The hypothesis that the thalamus serves as a neuronal oscillator of alpha rhythms has been supported by studies in animals, but only minimally by studies in humans.
METHODS: In the current study, PET-derived measures of regional glucose metabolism, EEG, and structural MRI were obtained from each participant to assess the relation between thalamic metabolic activity and alpha power in depressed patients and healthy controls. The thalamus was identified and drawn on each subject's MRI. The MRI was then co-registered to the corresponding PET scan and metabolic activity from the thalamus extracted. Thalamic activity was then correlated with a 30-min aggregated average of alpha EEG power.
RESULTS: Robust inverse correlations were observed in the control data, indicating that greater thalamic metabolism is correlated with decreased alpha power. No relation was found in the depressed patient data.
CONCLUSIONS: The results are discussed in the context of a possible abnormality in thalamocortical circuitry associated with depression.
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The information processing capacity of the human mind is limited, as is evidenced by the attentional blink-a deficit in identifying the second of two targets (T1 and T2) presented in close succession. This deficit is thought to result from an overinvestment of limited resources in T1 processing. We previously reported that intensive mental training in a style of meditation aimed at reducing elaborate object processing, reduced brain resource allocation to T1, and improved T2 accuracy [Slagter, H. A., Lutz, A., Greischar, L. L., Francis, A. D., Nieuwenhuis, S., Davis, J., et al. Mental training affects distribution of limited brain resources. PloS Biology, 5, e138, 2007]. Here we report EEG spectral analyses to examine the possibility that this reduction in elaborate T1 processing rendered the system more available to process new target information, as indexed by T2-locked phase variability. Intensive mental training was associated with decreased cross-trial variability in the phase of oscillatory theta activity after successfully detected T2s, in particular, for those individuals who showed the greatest reduction in brain resource allocation to T1. These data implicate theta phase locking in conscious target perception, and suggest that after mental training the cognitive system is more rapidly available to process new target information. Mental training was not associated with changes in the amplitude of T2-induced responses or oscillatory activity before task onset. In combination, these findings illustrate the usefulness of systematic mental training in the study of the human mind by revealing the neural mechanisms that enable the brain to successfully represent target information.
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<p>Philosophers speak-or, rather, they respond to various forms of speaking that are handed to them. This book by one of our most distinguished philosophers focuses on the communicative aspect of philosophical thought. Peperzak's central focus is addressing: what distinguishes speaking or writing from rumination is their being directed by someone to someone. To be involved in philosophy is to be part of a tradition through which thinkers propose their findings to others, who respond by offering their own appropriations to their interlocutors.After a critical sketch of the conception of modern philosophy, Peperzak presents a succinct analysis of speaking, insisting on the radical distinction between speaking about and speaking to. He enlarges this analysis to history and tries to answer the question whether philosophy also implies a certain form of listening and responding to words of God. Since philosophical speech about persons can neither honor nor reveal their full truth, speaking and thinking about God is even more problematic. Meditation about the archaic Word cannot reach the Speaker unless it turns into prayer, or-as Descartes wrote-into a contemplation that makes the thinker consider, admire, and adore the beauty of God's immense light, as much as the eyesight of my blinded mind can tolerate."Thinking is a work of genuine and original scholarship which responds to the tradition of philosophical thinking with a critique of its language, style, focus, and scope.-Catriona Hanley, Loyola College, Maryland</p>
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Mindfulness neuroscience is an emerging research field that investigates the underlying mechanisms of different mindfulness practices, different stages and different states of practice as well as different effects of practice over the lifespan. Mindfulness neuroscience research integrates theory and methods from eastern contemplative traditions, western psychology and neuroscience, and from neuroimaging techniques, physiological measures and behavioral tests. We here review several key theoretical and methodological challenges in the empirical study of mindfulness neuroscience and provide suggestions for overcoming these challenges.
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In this study, the authors both developed and validated a self-report mindfulness measure, the Toronto Mindfulness Scale (TMS). In Study 1, participants were individuals with and without meditation experience. Results showed good internal consistency and two factors, Curiosity and Decentering. Most of the expected relationships with other constructs were as expected. The TMS scores increased with increasing mindfulness meditation experience. In Study 2. criterion and incremental validity of the TMS were investigated on a group of individuals participating in 8-week mindfulness-based stress reduction programs. Results showed that TMS scores increased following treatment, and Decentering scores predicted improvements in clinical outcome. Thus, the TMS is a promising measure of the mindfulness state with good psychometric properties and predictive of treatment outcome. Keywords: Toronto Mindfulness Scale; self-report assessment: mindfulness; meditation; psychometric characteristics
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<p>In the present review of recent empirical research, the authors point to ways by which meditation may complement the traditional goals of the academy by helping to develop traditionally valued academic skills as well as help to build important emotional and interpersonal capacities that foster psychological well-being and the development of the whole person.</p>
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<p>Since its introduction to the behavioral science research community 25 years ago, interest in mindfulness has burgeoned. Much of that interest has been among clinical researchers testing the efficacy of mindfulness-based or mindfulness-integrated interventions for a variety of conditions and populations, and this volume is testament to the vitality of investigation and diversity of applied knowledge that now exist in the field. In the last 5 years or so, researchers have also become interested in describing and operationalizing the mindfulness construct itself. This more recent line of work is important for four reasons: The first concerns the basic scientific principle that a phenomenon can be studied only if it can be properly defined and measured.</p>
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<p>Reviews progress toward the development of a cognitive theory of aptitude for learning and presents descriptive and prescriptive goals for aptitude theories. Preliminary hypotheses about the nature of cognitive processes in aptitude for learning from instruction are reviewed. 12 constituent points of the descriptive theory are presented. Some of these points are summary conclusions on much prior research, whereas others are less well supported at present. However, all contribute to the effort to describe learning and aptitude for learning in conformable terms. Some prescriptive implications of the theory, intended as hypotheses for instructional development and design research in particular locations, are also discussed. (102 ref)</p>
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Spatial working memory is a cognitive brain mechanism that enables the temporary maintenance and manipulation of spatial information. Recent neuroimaging and behavioral studies have led to the proposal that directed spatial attention is the mechanism by which location information is maintained in spatial working memory. Yet it is unclear whether attentional involvement is required throughout the period of active maintenance or is only invoked during discrete task-phases such as mnemonic encoding. In the current study, we aimed to track the time-course of attentional involvement during spatial working memory by recording event-related brain potentials (ERPs) from healthy volunteers. In Experiment 1, subjects performed a delayed-recognition task. Each trial began with the presentation of a brief stimulus (S1) that indicated the relevant location that subjects were to maintain in working memory. A 4.8-5.3 sec delay interval followed during which a single task-irrelevant probe was presented. The delay interval concluded with a test item (S2) to which subjects made a response indicating whether the S2-location was the same as the S1-memory location. To determine if attention was differentially engaged during discrete phases of the trial, task-irrelevant probes were presented early (400-800 msec following S1-offset) or late (2600-3000 msec following S1-offset) during the delay interval. Sensory-evoked ERPs (P1 and N1) elicited by these irrelevant probes showed attention-like modulations with greater amplitude responses for probes occurring at the S1-memory locations in comparison to probes presented at other locations. This pattern was obtained for both early- and late-delay probes. Probe-evoked activity during delayed-recognition trials was similar to activity observed when spatial attention was explicitly focused on a location in visual space (Experiment 2). These results are consistent with a model of spatial working memory in which perceptual level selective attention is utilized throughout the entire period of active maintenance to keep relevant spatial information in mind.
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- Classical Buddhist Contemplation Practices,
- Practices Specific to Tibetan Buddhism,
- Literature Specific to Tibetan Buddhism,
- Contemplation by Tradition,
- Four Immeasurables (catvary apramanani, tsemé zhi),
- Avalokiteshvara (Chenrezik),
- Means of Accomplishment (sadana, druptap),
- Literature of Buddhist Contemplation,
- Practices of Buddhist Contemplation,
- Generation phase (utpattikrama, kyerim),
- Compassion Meditations,
- Deity yoga (devata-yoga, lhé nenjor),
- Buddhist Contemplation
Several randomised controlled trials suggest that mindfulness-based approaches are helpful in preventing depressive relapse and recurrence, and the UK Government’s National Institute for Health and Clinical Excellence has recommended these interventions for use in the National Health Service. There are good grounds to suggest that mindfulness-based approaches are also helpful with anxiety disorders and a range of chronic physical health problems, and there is much clinical and research interest in applying mindfulness approaches to other populations and problems such as people with personality disorders, substance abuse, and eating disorders. We review the UK context for developments in mindfulness-based approaches and set out criteria for mindfulness teacher competence and training steps, as well as some of the challenges and future directions that can be anticipated in ensuring that evidence-based mindfulness approaches are available in health care and other settings.
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<p>This two-year longitudinal study investigated the effect of participation in a special university curriculum, whose principal innovative feature is twice-daily practice of the Transcendental Meditation (TM) and TM-Sidhi program, on performance on Cattell's Culture Fair Intelligence Test (CFIT) and Hick's reaction time. These measures are known to be correlated with general intelligence. One hundred college men and women were the subjects—45 from Maharishi International University (MIU) and 55 from the University of Northern Iowa (UNI). The experimental group (MIU) improved significantly on the CFIT (t=2.79, P<0.005); choice reaction time (t=9.10, P<0.0001); SD of choice reaction time (t=11.39, P<0.0001), and simple reaction time (t=2.11, P<0.025) over two years compared to the control group, which showed no improvement. Possible confounds of subject's age, education level, level of interest in meditation, father's education level, and father's annual income were controlled for using analysis of covariance and stepwise regression. The results replicate the findings of previous longitudinal studies on intelligence test scores at MIU, and indicate that participation in the MIU curriculum results in improvements in measures related to general intelligence.</p>
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- Practices of Hindu Contemplation,
- Contemplation by Applied Subject,
- Contemplation by Tradition,
- Scientific Studies of Transcendental Meditation,
- Transcendental Meditation (TM),
- Theories of Learning and Contemplation,
- Higher Education and Contemplation,
- Education and Contemplation,
- Hindu Contemplation
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- Practices Specific to Tibetan Buddhism,
- Contemplation by Tradition,
- Six Yogas (jordruk) of Kalachakra,
- Kalachakra,
- Guru yoga (lamé nenjor),
- Empowerment (abhisheka, dbang),
- Practices of Buddhist Contemplation,
- Generation phase (utpattikrama, kyerim),
- Perfection phase (nispannakrama, dzokrim),
- Deity yoga (devata-yoga, lhé nenjor),
- Buddhist Contemplation
Zotero Collections:
Zotero Collections:
- Practices Specific to Tibetan Buddhism,
- Tibetan Buddhism,
- Buddhist Contemplation by Tradition,
- Contemplation by Tradition,
- Six Yogas (jordruk) of Kalachakra,
- Six Dharmas of Naropa,
- Practices of Buddhist Contemplation,
- Generation phase (utpattikrama, kyerim),
- Cutting (chö),
- Great Seal (Mahamudra, Chakchen),
- Great Perfection (Dzokchen),
- Perfection phase (nispannakrama, dzokrim),
- Deity yoga (devata-yoga, lhé nenjor),
- Buddhist Contemplation
<p>This study is an open clinical trial that examined the feasibility and acceptability of a mindfulness training program for anxious children. We based this pilot initiative on a cognitively oriented model, which suggests that, since impaired attention is a core symptom of anxiety, enhancing self-management of attention should effect reductions in anxiety. Mindfulness practices are essentially attention enhancing techniques that have shown promise as clinical treatments for adult anxiety and depression (Baer, 2003). However, little research explores the potential benefits of mindfulness to treat anxious children. The present study provided preliminary support for our model of treating childhood anxiety with mindfulness. A 6-week trial was conducted with five anxious children aged 7 to 8 years old. The results of this study suggest that mindfulness can be taught to children and holds promise as an intervention for anxiety symptoms. Results suggest that clinical improvements may be related to initial levels of attention.</p>
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This preliminary study examined whether the practice of mind–body techniques decreases symptoms of posttraumatic stress in adolescents. Posttraumatic Stress Reaction Index questionnaires were collected from 139 high school students in Kosovo who participated in a 6-week program that included meditation, biofeedback, drawings, autogenic training, guided imagery, genograms, movement, and breathing techniques. Three separate programs were held approximately 2 months apart. There was no control group. Posttraumatic stress scores significantly decreased after participation in the programs. These scores remained decreased in the 2 groups that participated in the follow-up study when compared to pretest measures. These data indicate that mind–body skills groups were effective in reducing posttraumatic stress symptoms in war-traumatized high school students.
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