Co-Planar Stereotaxic Atlas of the Human Brain—3-Dimensional Proportional System: An Approach to Cerebral Imaging, J. Talairach, P. Tournoux. Georg Thieme Verlag, New York (1988), 122 pp., 130 figs. DM 268

Part 1 The departing ground: a fundamental circularity - in the mind of the reflective scientist - an already-given condition, what is cognitive science?, cognitive science within the circle, the theme of this book what do we mean "Human Experience"? - science and the phenomenological tradition, the breakdown of phenomenology, a non-western philosophical tradition, examining experience with a method - mindfulness/awareness, the role of reflection in the analysis of experience, experimentation and experiential analysis. Part 2 Varieties of cognitivism: symbols - the cognitivist hypothesis - the foundational cloud, defining the cognitivist hypothesis, manifestations of cognitivism, cognitivism and human experience, experience and the computational mind the I of the storm - what do we mean by "Self"?, looking for a self in the aggregates, momentariness and the brain, the aggregates without a self. Part 3 Varieties of emergence: emergent properties and connectionism - self-organization - the roots of an alternative, the connectionist strategy, emergence and self-organization, connectionism today, neuronal emergences, exeunt the symbols, linking symbols and emergence selfless minds - societies of mind, the society of object relations, co-dependent arising, basic element analysis, mindfulness and freedom, selfless minds, divided agents, minding the world. Part 4 Steps to a middle way: the Cartesian anxiety - a sense of dissatisfaction, representation revisited, the Cartesian anxiety, steps to a middle way, enaction - embodied cognition - recovering common sense, self-organization revisited, colour as a study case, cognition as embodied action, the retreat into natural selection evolutionary path making and natural drift - adaptationism - an idea in transition, a horizon of multiple mechanisms, beyond the best in evolution and cognition, evolution - ecology and development in congruence, lessons from evolution as natural drift, defining the enactive approach, enactive cognitive science. Part 5 Worlds without ground: the middle way - evocations of groundlessness, Nagarjuna and the Madhyamika tradition, the two truths, groundlessness in contemporary thought laying down a path in walking - science and experience in circulation, nihilism and the need for planetary thinking, Nishitani Keiji, ethics and human transformation. Appendices: meditation terminology categories of experiential events used in mindfulness/awareness works on Buddhism and mindfulness/awareness.

The Embodied Mind: Cognitive Science and Human Experience

Interventions based on training in mindfulness skills are becoming increasingly popular. Mindfulness involves intentionally bringing one's attention to the internal and external experiences occurring in the present moment, and is often taught through a variety of meditation exercises. This review summarizes conceptual approaches to mind-fulness and empirical research on the utility of mindfulness-based interventions. Meta-analytic techniques were incorporated to facilitate quantification of findings and comparison across studies. Although the current empirical literature includes many methodological flaws, findings suggest that mindfulness-based interventions may be helpful in the treatment of several disorders. Methodologically sound investigations are recommended in order to clarify the utility of these interventions.

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Mindfulness Training as a Clinical Intervention: A Conceptual and Empirical Review

In 57 normal subjects (age 20-60 years), we analyzed the spontaneous beat-to-beat oscillation in R-R interval during control recumbent position, 90 degrees upright tilt, controlled respiration (n = 16) and acute (n = 10) and chronic (n = 12) beta-adrenergic receptor blockade. Automatic computer analysis provided the autoregressive power spectral density, as well as the number and relative power of the individual components. The power spectral density of R-R interval variability contained two major components in power, a high frequency at approximately 0.25 Hz and a low frequency at approximately 0.1 Hz, with a normalized low frequency:high frequency ratio of 3.6 +/- 0.7. With tilt, the low-frequency component became largely predominant (90 +/- 1%) with a low frequency:high frequency ratio of 21 +/- 4. Acute beta-adrenergic receptor blockade (0.2 mg/kg IV propranolol) increased variance at rest and markedly blunted the increase in low frequency and low frequency:high frequency ratio induced by tilt. Chronic beta-adrenergic receptor blockade (0.6 mg/kg p.o. propranolol, t.i.d.), in addition, reduced low frequency and increased high frequency at rest, while limiting the low frequency:high frequency ratio increase produced by tilt. Controlled respiration produced at rest a marked increase in the high-frequency component, with a reduction of the low-frequency component and of the low frequency:high frequency ratio (0.7 +/- 0.1); during tilt, the increase in the low frequency:high frequency ratio (8.3 +/- 1.6) was significantly smaller. In seven additional subjects in whom direct high-fidelity arterial pressure was recorded, simultaneous R-R interval and arterial pressure variabilities were examined at rest and during tilt. Also, the power spectral density of arterial pressure variability contained two major components, with a relative low frequency:high frequency ratio at rest of 2.8 +/- 0.7, which became 17 +/- 5 with tilt. These power spectral density components were numerically similar to those observed in R-R variability. Thus, invasive and noninvasive studies provided similar results. More direct information on the role of cardiac sympathetic nerves on R-R and arterial pressure variabilities was derived from a group of experiments in conscious dogs before and after bilateral stellectomy. Under control conditions, high frequency was predominant and low frequency was very small or absent, owing to a predominant vagal tone. During a 9% decrease in arterial pressure obtained with IV nitroglycerin, there was a marked increase in low frequency, as a result of reflex sympathetic activation.(ABSTRACT TRUNCATED AT 400 WORDS)

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Power spectral analysis of heart rate and arterial pressure variabilities as a marker of sympatho-vagal interaction in man and conscious dog.

The propensity score is the conditional probability of assignment to a particular treatment given a vector of observed covariates. Previous theoretical arguments have shown that subclassification on the propensity score will balance all observed covariates. Subclassification on an estimated propensity score is illustrated, using observational data on treatments for coronary artery disease. Five subclasses defined by the estimated propensity score are constructed that balance 74 covariates, and thereby provide estimates of treatment effects using direct adjustment. These subclasses are applied within sub-populations, and model-based adjustments are then used to provide estimates of treatment effects within these sub-populations. Two appendixes address theoretical issues related to the application: the effectiveness of subclassification on the propensity score in removing bias, and balancing properties of propensity scores with incomplete data.

Reducing Bias in Observational Studies Using Subclassification on the Propensity Score

Spectral analysis of spontaneous heart rate fluctuations were assessed by use of autonomic blocking agents and changes in posture. Low-frequency fluctuations (below 0.12 Hz) in the supine position are mediated entirely by the parasympathetic nervous system. On standing, the low-frequency fluctuations increase and are jointly mediated by the sympathetic and parasympathetic nervous systems. High-frequency fluctuations, at the respiratory frequency, are decreased by standing and are mediated solely by the parasympathetic system. Heart rate spectral analysis is a powerful noninvasive tool for quantifying autonomic nervous system activity.

Assessment of autonomic function in human by heart rate spectral analysis

When Dr. Herbert Benson introduced this simple, effective, mind/body approach to relieving stress twenty-five years ag, his book became an instant national bestseller. Since that time, millions of people have learned the secret--without high-priced lectures or prescription medicines. The Relaxation Response has become the classic reference recommended by most health care professionals and authorities to treat the harmful effects of stress.Discovered by Dr. Benson and his colleagues in the laboratories of Harvard Medical School and its teaching hospitals, this revitalizing, therapeutic approach is now routinely recommended to treat patients suffering from heart conditions, high blood pressure, chronic pain, insomnia, and many other physical ailments. It requires only minutes to learn, and just ten to twenty minutes of practice twice a day.

The Relaxation Response

Previous research indicates that long-term meditation practice is associated with altered resting electroencephalogram patterns, suggestive of long lasting changes in brain activity. We hypothesized that meditation practice might also be associated with changes in the brain’s physical structure. Magnetic resonance imaging was used to assess cortical thickness in 20 participants with extensive Insight meditation experience, which involves focused attention to internal experiences. Brain regions associated with attention, interoception and sensory processing were thicker in meditation participants than matched controls, including the prefrontal cortex and right anterior insula. Between-group diierences in prefrontal cortical thickness were most pronounced in older participants, suggesting that meditation might oiset age-related cortical thinning. Finally, the thickness of two regions correlated with meditation experience. These data provide the ¢rst structural evidence for experience-dependent cortical plasticity associated with meditation practice. NeuroReport 16:1893^1897 � c 2005 Lippincott Williams & Wilkins.

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Meditation experience is associated with increased cortical thickness

Background Many anecdotes and several uncontrolled case series have suggested that emotionally stressful events, and more specifically, anger, immediately precede and appear to trigger the onset of acute myocardial infarction. However, controlled studies to determine the relative risk of myocardial infarction after episodes of anger have not been reported. Methods and Results We interviewed 1623 patients (501 women) an average of 4 days after myocardial infarction. The interview identified the time, place, and quality of myocardial infarction pain and other symptoms, the estimated usual frequency of anger during the previous year, and the intensity and timing of anger and other potentially triggering factors during the 26 hours before the onset of myocardial infarction. Anger was assessed by the onset anger scale, a single-item, seven-level, self-report scale, and the state anger subscale of the State-Trait Personality Inventory. Occurrence of anger in the 2 hours preceding the onset of myocardial infarct...

Triggering of acute myocardial infarction onset by episodes of anger. Determinants of Myocardial Infarction Onset Study Investigators.

Meditation is a conscious mental process that induces a set of integrated physiologic changes termed the relaxation response. Functional magnetic resonance imaging (fMRI) was used to identify and characterize the brain regions that are active during a simple form of meditation. Significant (p < 10 7 ) signal increases were observed in the group-averaged data in the dorsolateral prefrontal and parietal cortices, hippocampus/ parahippocampus, temporal lobe, pregenual anterior cingulate cortex, striatum, and pre- and post-central gyri during meditation. Global fMRI signal decreases were also noted, although these were probably secondary to cardiorespiratory changes that often accompany meditation. The results indicate that the practice of meditation activates neural structures involved in attention and control of the autonomic nervous system.

Herbert Benson

Papers

Assessment of autonomic function in human by heart rate spectral analysis

The Relaxation Response

Meditation experience is associated with increased cortical thickness

Triggering of acute myocardial infarction onset by episodes of anger. Determinants of Myocardial Infarction Onset Study Investigators.

Functional brain mapping of the relaxation response and meditation.