Ross Heaven, founder of The Four Gates web site, has written many articles and books on various subjects including plant spirit medicine and shamanism.
Integral to any ayahausca ceremony are sacred chants sung by the shamans to call the protective jungle spirits, summon the essence of nature, and to provoke the mareacion or effects of the ayahuasca by making a plea to the spirit of the vine. In the words of Javier Aravelo, quoted in my book, Plant Spirit Shamanism, icaros “render the mind susceptible for visions; then the curtains can open for the start of the theatre”
"Shamans believe that the soul can be lost through trauma, abuse, shock - and, fundamentally, by dishonouring nature or ignoring our need to connect with it. In many shamanic countries, there are still roadside shrines where people can rest, pay their respects to the natural world, and receive healing and replenishment from it."
"In Peru, floral baths known as banjos florales (flower baths) are a staple of shamanic healing from the high Andes to the Amazon basin, where they are used to wash away unhelpful spirits so that blockages are removed and the energy of the universe can flood in to correct the imbalance... The patient must approach in a sacred manner, in prayer that his needs will be met, and with the intention that they will. The shaman then pours the water over his head and lets it run down his body, also blowing him with smoke to purify him, or with perfume so he will flourish."