Researcher: Moses was tripping at Mount Sinai By Ofri Ilani "And all the people perceived the thunderings, and the lightnings, and the voice of the horn, and the mountain smoking." Thus the book of Exodus describes the impressive moment of the giving of the Torah on Mount Sinai. The "perceiving of the voices" has been interpreted endlessly since these words were first written. When Professor Benny Shanon, professor of cognitive psychology at the Hebrew University of Jerusalem, reads the verse, he recalls a powerful hallucinatory experience he had when he visited the Amazon and drank a potion made from a plant called ayahuasca. Advertisement "One of the things that happens when you drink the potion is a visual experience created via sounds," he says.