Great apes deliberately rotation astir to marque themselves dizzy, researchers believe.
The survey by the universities of Warwick and Birmingham could supply clues astir humans evolving the tendency to question altered intelligence states and actively manipulate their temper and cognition of reality.
Researchers observed online videos successful which large apes - gorillas, chimpanzees, bonobos and orangutans - rotation to deliberately marque themselves dizzy.
"Every civilization has recovered a mode of evading world done dedicated and peculiar rituals, practices oregon ceremonies," said Dr Adriano Lameira, subordinate prof of science astatine the University of Warwick, who co-led the study.
"This quality trait of seeking altered states is truthful universal, historically and culturally, that it raises the intriguing anticipation that this is thing that has been perchance inherited from our evolutionary ancestors.
"If this was so the case, it would transportation immense consequences connected however we deliberation astir modern quality cognition capacities and affectional needs."
The probe squad analysed 40 videos and recovered the primates revolved 5.5 times per occurrence of spinning connected average, with an mean velocity of 1.5 revolutions per second. They did this connected mean 3 times.
The survey compared spinning speeds and recovered the animals tin rotation portion holding a enactment arsenic accelerated arsenic nonrecreational quality dancers and circus artists - arsenic good arsenic Dervish Muslims who instrumentality portion successful whirling ceremonies successful bid to execute a spiritual trance.
Chimp shares entity - showing behaviour thought to beryllium unsocial to humans
Parallel betwixt ape and quality behaviour 'beyond coincidental'
Dr Lameira added: "Spinning alters our authorities of consciousness, it messes up with our body-mind responsiveness and coordination, which marque america consciousness sick, lightheaded, and adjacent elated arsenic successful the lawsuit of children playing successful merry-go-rounds, spinner-wheels and carousels."
He continued: "If each large apes question dizziness, past our ancestors are besides highly apt to person done so.
"We asked ourselves what relation these behaviours play erstwhile it comes to the origins of the quality mind.
"The apes were doing this purposefully, astir arsenic if they were dancing - a known mechanics successful humans that universally facilitates temper regulation, societal bonding and heightens the senses and is based connected rotation movements.
"The parallel betwixt what the apes were doing and what humans bash was beyond coincidental."
Apes 'deliberately support spinning contempt effects of dizziness'
In videos wherever the animals utilized ropes oregon vines to rotation they spun the fastest and for the longest magnitude of time, the survey found.
The researchers besides tried spinning astatine these speeds and times themselves and recovered it hard to execute the 3rd bout of spins astatine these speeds - apes were noticeably dizzy astatine that constituent successful the video and were apt to suffer their equilibrium and autumn down.
"This would bespeak that the primates deliberately support spinning, contempt starting to consciousness the effects of dizziness, until they are incapable to support their equilibrium immoderate longer," explained Dr Marcus Perlman, lecturer astatine the section of English connection and linguistics of the University of Birmingham, who co-led the research.
Study could explicate relation of altered states connected improvement of quality mind
While past studies attempting to recognize quality information for self-induced dizziness focused connected substance usage specified arsenic intoxicant oregon drugs, it is uncertain whether these oregon different substances would person been accessible to quality ancestors.
The researchers said this survey could beryllium much applicable to explicate the relation of altered states connected the improvement of the quality mind.
Dr Lameira said: "The further backmost successful quality past you look, the little definite we tin beryllium astir the relation that substance-induced experiences played successful our evolution.
"It's not wide whether our ancestors had entree to mind-altering substances, oregon if they had the tools and cognition to make the substance.
"For example, radical whitethorn person had entree to grapes, but you cannot presume they person the tools oregon the cognition to make wine."
The researchers accidental further probe is needed to recognize the animals' motivations for engaging successful the spinning behaviours.
The survey was published successful the Primates journal.