Abstract
One of the techniques used to induce trance state in shamanic ceremonies is monotonous drumming. According to previous EEG research, certain patterns of drumming cause an increase in power of alpha and theta frequencies of the listener. Present study aimed to determine, if suggestion to experience trance state could increase the relative alpha and theta amplitude and the intensity of experienced state. A group of twenty-four subjects participated in the study. Suggestion to experience trance state decreased alpha frequency power during the drumming condition. No other significant effects of suggestion or drumming were found.
Highlights
One of the techniques used to induce trance state in shamanic ceremonies is monotonous drumming
The topic of shamanic trance states was extensively covered in the field of anthropology, only a few researchers set out to examine its behavioral aspects in an experimental setting
Treating Phenomenology of Consciousness Inventory (PCI) questionnaire Altered Experience score as an indicator of experienced trance state it can be doubted whether the drumming stimulus and suggestion succeeded in inducing the altered experience reported by previous research [8,9,10]
Summary
One of the techniques used to induce trance state in shamanic ceremonies is monotonous drumming. According to previous EEG research, certain patterns of drumming cause an increase in power of alpha and theta frequencies of the listener. Suggestion to experience trance state decreased alpha frequency power during the drumming condition. A very popular instrument used in ceremonies is the drum, and monotonous patterns of drumming are often used to induce a state of trance. After listening to a 15 min recording of monotonous drumming the participants (N=206) rated their subjective experience. Forty participants reported experiencing shamanic trance state while listening to drumming. [9] examined the subjective experience of participants (N=12) who listened to different patterns of monotonous drumming. The experiment supports the hypothesis that rhythmic drumming can induce state of trance [9]
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