▁to ▁the ▁ps y cho active ▁properties ▁of ▁plants ▁in ▁ancient ▁civil ization ▁and ▁the ▁pre histor ic ▁period ▁than ▁expert ▁knowledge ▁h ither to . ▁ ▁Part ▁one : ▁The ▁Fly ▁Ag ar ic ▁M ush room ▁ ▁scient ists : ▁Michael ▁Car m ich ael , ▁Eth n ob ot an ist / An th rop ologist ▁Dr ▁Cos mo ▁H oll st rom , ▁psych iat rist ▁and ▁lect urer ▁at ▁Imperial ▁College ▁Dr ▁Jo anna ▁I dd on , ▁from ▁Ce Ne S ▁C ogn ition ▁volunte ers : ▁Ed ▁Tur pin , ▁Johnny ▁Green ▁ ▁Mem or able ▁moments ▁include ▁a ▁long ▁ha ired ▁particip ant ▁in ▁bag gy ▁clothes , ▁athlet ically ▁clim bing ▁a ▁large ▁tree ▁and ▁y el ping ▁with ▁excitement . ▁The ▁clin ical ▁and ▁ske pt ical ▁approach ▁of ▁Dr . ▁Cos mo ▁contrast ed ▁with ▁the ▁psych ological ▁and ▁for ens ic ▁approach ▁of ▁Michael ▁Car m ich ael . ▁The ▁two ▁sch ol ars ▁deb ated ▁the ▁significance ▁of ▁research ▁into ▁alter ed ▁states ▁of ▁conscious ness . ▁ ▁Part ▁two : ▁Sal via ▁Div in orum ▁ ▁scient ists : ▁Dr ▁Fran ço ise ▁Barb ira - Fre ed man , ▁medical ▁anth rop ologist ▁and ▁lect urer ▁at ▁the ▁University ▁of ▁Cambridge ▁Dr ▁Tim ▁K end all , ▁psych iat rist ▁and ▁director ▁of ▁the ▁Centre ▁for ▁Psych other ape ut ic ▁Studies ▁Dr ▁Jon ▁Rob b ins , ▁ph arm ac ologist ▁at ▁King ' s ▁College ▁London