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Voluntary upregulation of heart rate variability is improved by mental contemplative training. Scientific Reports, 9:7860.

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It matters what you practice: Differential training effects on subjective experience, behavior, brain and body in the ReSource Project. Current Opinion in Psychology, 28, pp. 151 – 158

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Structural plasticity of the social brain: Differential change after socio-affective and cognitive mental training. Science Advances, 3(10): e1700489.

Engert, V., Kok, B. E., Papassotiriou, I., Chrousos, G. P., & Singer, T. (2017).

Specific reduction in cortisol stress reactivity after social but not attention-based mental training. Science Advances, 3(10): e1700495.

Kok, B. E.; Singer, T. (2017).

Effects of contemplative dyads on engagement and perceived social connectedness over 9 months of mental training: A randomized clinical trial. JAMA Psychiatry 74(2), pp. 126 – 134.