ABSTRACT
The main aim was to study effects of long-term meditation practice on event-related brain potentials (ERPs) during affective picture viewing. The meditators' (N = 20), contrary to control (N = 20), did not demonstrate arousal-related increases in the mid-latency (200-400 ms) ERP positivity over the right hemisphere. We also found in the same time window stronger ERP negativity for meditators over central regions, regardless of picture valence. We assume that long-term meditation practice enhances frontal top-down control over fast automatic detection of stimulus salience.
Subject(s)
Cerebrum/physiology , Evoked Potentials/physiology , Meditation/psychology , Pattern Recognition, Visual/physiology , Adult , Amygdala/physiology , Arousal , Brain Mapping , Electroencephalography , Emotions/physiology , Humans , Male , Photic StimulationABSTRACT
Attentional biases towards affective stimuli reflect an individual balance of appetitive and aversive motivational systems. Vigilance in relation to threatening information reflects emotional imbalance, associated with affective and somatic problems. It is known that meditation practice significantly improves control of attention, which is considered to be a tool for adaptive emotional regulation. In this regard, the main aim of the present study was to evaluate the influence of meditation on attentional bias towards neutral and emotional facial expressions. Eyes were tracked while 21 healthy controls and 23 experienced meditators (all males) viewed displays consisting of four facial expressions (neutral, angry, fearful and happy) for 10 s. Measures of biases in initial orienting and maintenance of attention were assessed. No effects were found for initial orienting biases. Meditators spent significantly less time viewing angry and fearful faces than control subjects. Furthermore, meditators selectively attended to happy faces whereas control subjects showed attentional biases towards both angry and happy faces. In sum we can conclude that long-term meditation practice adaptively affects attentional biases towards motivationally significant stimuli and that these biases reflect positive mood and predominance of appetitive motivation.
Subject(s)
Attention/physiology , Emotions , Eye Movements/physiology , Facial Expression , Meditation/psychology , Adult , Humans , MaleABSTRACT
Despite growing interest in meditation as a tool for alternative therapy of stress-related and psychosomatic diseases, brain mechanisms of beneficial influences of meditation practice on health and quality of life are still unclear. We propose that the key point is a persistent change in emotional functioning, specifically the modulation of the early appraisal of motivational significance of events. The main aim was to study the effects of long-term meditation practice on event-related brain potentials (ERPs) during affective picture viewing. ERPs were recorded in 20 long-term Sahaja Yoga meditators and 20 control subjects without prior experience in meditation. The meditators' mid-latency (140-400ms) ERPs were attenuated for both positive and negative pictures (i.e. there were no arousal-related increases in ERP positivity) and this effect was more prominent over the right hemisphere. However, we found no differences in the long latency (400-800ms) responses to emotional images, associated with meditation practice. In addition we found stronger ERP negativity in the time window 200-300ms for meditators compared to the controls, regardless of picture valence. We assume that long-term meditation practice enhances frontal top-down control over fast automatic salience detection, based on amygdala functions.
