I control therefore I am: chimps self-aware, says study

Chimpanzees are self-aware and can anticipate the impact of their actions on the environment around them, an ability once thought to be uniquely human, according to a study released Wednesday.

The findings, reported in the Proceedings of the Royal Society B, challenge assumptions about the boundary between human and non-human, and shed light on the evolutionary origins of consciousness, the researchers said.

Earlier research had demonstrated the capacity of several species of primates, as well as dolphins, to recognize themselves in a mirror, suggesting a fairly sophisticated sense of self.

The most common experiment consisted of marking an animal with paint in a place - such as the face - that it could only perceive while looking at its reflection.

If the ape sought to touch or wipe off the mark while facing a mirror, it showed that the animal recognised itself.

But even if this test revealed a certain degree self-awareness, many questions remained as to how animals were taking in the information. What, in other words, was the underlying cognitive process?

To probe further, Takaaki Kaneko and Masaki Tomonaga of the Primate Research Institute in Kyoto designed a series of three experiments to see if chimps, our closest cousins genetically, to some extent "think" like humans when they perform certain tasks.

In the first, three females initiated a video game by placing a finger on a touch-sensitive screen and then used a trackball, similar to a computer mouse, to move one of two cursors.

The movement of the second cursor, designed to distract or confuse the chimps, was a recording of gestures made earlier by the same animal and set in motion by the computer.

The "game" ended when the animal hit a target, or after a certain lapse of time.

At this point, the chimp had to identify with his finger which of the two cursors he had been manipulating, and received a reward if she chose correctly. All three animals scored above 90 percent.

"This indicates that the chimpanzees were able to distinguish the cursor actions controlled by themselves from those caused by other factors, even when the physical properties of those actions were almost identical," the researchers said.

But it was still not clear whether the good performance was truly due to the ability to discern "self-agency", or to observing visual cues and clues, so the researchers devised another set of conditions.

This time they compared two tests. The first was the same as in the previous experiment.

In the second, however, both cursors moved independently of efforts to control them, one a repeat of movements the chimp had generated in an earlier exercise, and the other a repeat of an "decoy" cursor. The trackball, in essence, was unplugged, and had no connection to the screen.

If the animals performed well on the first test but poorly on the second, the scientists reasoned, it would suggest that they were not simply responding to visual properties but knew they were in charge.

The final experiment - used only for the most talented of the chimps - introduced a time delay between trackball and cursor, as if the two were out of sync, and a distortion in the direction the cursor moved on the screen.

All the results suggested that "chimpanzees and humans share fundamental cognitive processes underlying the sense of being an independent agent," the researchers concluded.

"We provide the first behavioural evidence that chimpanzees can perform distinctions between self and other for external events on the basis of a self-monitoring process."

ban-mh/ach

 

Life and Style
ebookNow available in paperback
ebooks
ebookA delicious collection of 50 meaty main courses
Latest stories from i100
Have you tried new the Independent Digital Edition apps?

ES Rentals

    Independent Dating
    and  

    By clicking 'Search' you
    are agreeing to our
    Terms of Use.

    iJobs Job Widget
    iJobs General

    Recruitment Genius: Project Coordinator

    £28000 - £30000 per annum: Recruitment Genius: A Project Coordinator is requir...

    Recruitment Genius: Area Sales Manager - Midlands

    £20000 - £25000 per annum: Recruitment Genius: This is an exciting opportunity...

    Recruitment Genius: PHP Developer - 3-4 Month Fixed Contract - £30-£35k pro rata

    £30000 - £35000 per annum: Recruitment Genius: This is a 3-4 month pro rata fi...

    Recruitment Genius: Telesales Executive - OTE £26,000+

    £16000 - £26000 per annum: Recruitment Genius: A Telesales Executive is requir...

    Day In a Page

    Seifeddine Rezgui: What motivated a shy student to kill 38 holidaymakers in Tunisia?

    Making of a killer

    What motivated a shy student to kill 38 holidaymakers in Tunisia?
    UK Heatwave: Temperatures on the tube are going to exceed the legal limit for transporting cattle

    Just when you thought your commute couldn't get any worse...

    Heatwave will see temperatures on the Tube exceed legal limit for transporting cattle
    Exclusive - The Real Stories of Migrant Britain: Swapping Bucharest for London

    The Real Stories of Migrant Britain

    Meet the man who swapped Romania for the UK in a bid to provide for his family, only to discover that the home he left behind wasn't quite what it seemed
    Cheaper energy on the way, but it's not all sunshine and rainbows

    Cheaper energy on the way, but it's not all sunshine and rainbows

    Solar power will help bring down electricity prices over the next five years, according to a new report. But it’s cheap imports of ‘dirty power’ that will lower them the most
    Katy Perry prevented from buying California convent for $14.5m after nuns sell to local businesswoman instead

    No grace of God for Katy Perry as sisters act to stop her buying convent

    Archdiocese sues nuns who turned down star’s $14.5m because they don’t approve of her
    Ajmer: The ancient Indian metropolis chosen to be a 'smart city' where residents would just be happy to have power and running water

    Residents just want water and power in a city chosen to be a ‘smart’ metropolis

    The Indian Government has launched an ambitious plan to transform 100 of its crumbling cities
    Michael Fassbender in 'Macbeth': The Scottish play on film, from Welles to Cheggers

    Something wicked?

    Films of Macbeth don’t always end well - just ask Orson Welles... and Keith Chegwin
    10 best sun creams for body

    10 best sun creams for body

    Make sure you’re protected from head to toe in the heatwave
    Wimbledon 2015: Nick Bollettieri - Milos Raonic has ability to get to the top but he must learn to handle pressure in big games

    Nick Bollettieri's Wimbledon files

    Milos Raonic has ability to get to the top but he must learn to handle pressure in big games
    Women's World Cup 2015: How England's semi-final success could do wonders for both sexes

    There is more than a shiny trophy to be won by England’s World Cup women

    The success of the decidedly non-famous females wearing the Three Lions could do wonders for a ‘man’s game’ riddled with cynicism and greed
    How to stop an asteroid hitting Earth: Would people co-operate to face down a global peril?

    How to stop an asteroid hitting Earth

    Would people cooperate to face a global peril?
    Just one day to find €1.6bn: Greece edges nearer euro exit

    One day to find €1.6bn

    Greece is edging inexorably towards an exit from the euro
    New 'Iron Man' augmented reality technology could help surgeons and firefighters, say scientists

    'Iron Man' augmented reality technology could become reality

    Holographic projections would provide extra information on objects in a person's visual field in real time
    Sugary drinks 'are killing 184,000 adults around the world every year'

    Sugary drinks are killing 184,000 adults around the world every year

    The drinks that should be eliminated from people's diets
    Pride of Place: Historians map out untold LGBT histories of locations throughout UK

    Historians map out untold LGBT histories

    Public are being asked to help improve the map