... During the time delay the experimenter's empty hand is closed (2). If a bird does wait, it has the opportunity to return the food into the experimenter's (now open) empty hand (3) and to receive the high quality food from the other hand (4). (Copyright: Alice Auersperg)

Schematic presentation of the Procedure: The birds were first shown both food types inside the open hands of the experimenter and are then allowed to pick up the item of lower quality (1). Thereafter the animals have to decide to either eat the food straight away or to wait out the time delay. ...

The team of Alice Auersperg from the Department of Cognitive Biology from the University of Vienna has for the first time succeeded in observing self-control of cockatoos in exchange experiments. The results of this research project appear in the current issue of the prestigious journal Biology Letters.

Waiting: a clever move!

In the 70ties, self-control of human infants was investigated using the prominent 'Stanford Marshmallow Experiment': the children were presented with a marshmallow and were told they could either eat it now or wait and receive a second one if the first one was still intact after a time delay of several minutes. Interestingly, children that were able to wait for the delayed reward showed greater success in adult life than the ones that ate the first marshmallow right away. The ability to anticipate a delayed gain is considered cognitively challenging since it requires not only the capacity to control an direct impulse but also to assess the gain’s beneficial value relative to the costs associated with having to wait as well as the reliability of the trader. Such abilities can be considered precursors of economic decision making and are rarely found outside humans. Only few, typically large brained animals, have been shown to be able to inhibit the consumption of an immediate food reward in anticipation for a bigger one for more than one minute.

Speculative trading of the Goffin cockatoos

A new study at the University of Vienna, on an Indonesian cockatoo species – the Goffin's cockatoo – which recently made headlines, showed notable results. "The animals were allowed to pick up an initial food item and given the opportunity to return it directly into the experimenter's hand after an increasing time delay. If the initial food item had not been nibbled by this time, the bird received another reward of an even higher preferred food type or of a larger quantity than the initial food in exchange" explains Isabelle Laumer, who conducted the study at the Goffin Lab at the University of Vienna. "Although we picked pecan nuts as initial reward which were highly liked by the birds and would under normal circumstances be consumed straight away, we found that all 14 of birds waited for food of higher quality, such as cashew nut for up to 80 seconds", she further reports.

Evolution of self-control

Alice Auersperg, the manager of the Vienna Goffin Lab says: "When exchanging for better qualities, the Goffins acted astonishingly like economic agents, flexibly trading-off between immediate and future benefits. They did so, relative not only to the length of delay, but also to the difference in trade value between the 'currency' and the 'merchandise': they tended to trade their initial items more often for their most preferred food, than for one of intermediate preference value and did not exchange in a control test in which the value of the initial item was higher than that of the expected one". She adds: "While human infants or primates can hold the initial food in their hands, one should also consider that the birds were able to wait, although they had to hold the food in their beaks, directly against their taste organs while waiting. Imagine placing a cookie directly into a toddler's mouth and telling him/her, he/she will only receive a piece of chocolate if the cookie is not nibbled for over a minute".

Thomas Bugnyar, who previously conducted similar studies on ravens and crows, says "Until recently, birds were considered to lack any self-control. When we found that corvids could wait for delayed food, we speculated which socio-ecological conditions could favor the evolution of such skills. To test our ideas we needed clever birds that are distantly related to corvids. Parrots were the obvious choice and the results on Goffins show that we are on the right track".

Publication in Biology Letters

Auersperg, A.M.I., Laumer, L. & Bugnyar, T. (2013) Goffin cockatoos wait for qualitative and quantitative gains but prefer 'better' to 'more'. Biology Letters.

For further information see: http://cogbio.univie.ac.at/labs/goffin-lab/

In autumn 2012 Alice Auersperg publicized highly remarked experiments in Goffin cockatoos, that prove intelligent skills as being able to use and make tools in the parrots: "Clever cockatoo with skilled craftsmanship"

Scientific contact

Dr. Alice Auersperg

Department of Cognitive Biology

University of Vienna

1090 Vienna, Althanstrasse 14

T +43-1-4277-761 01

M +43-676-939 03 92

alice.auersperg(at)univie.ac.at

Further inquiries

Mag. Alexandra Frey

Press office of the University of Vienna

Research and Teaching

1010 Vienna, Universitätsring 1

T +43-1-4277-175 33

M +43-664-602 77-175 33

alexandra.frey(at)univie.ac.at