Animal behaviour: Rats can accurately estimate the passage of time

[ad_1]

Rats trained to leave 3.2 seconds between presses of a lever or to hold it down for this length of time seem able to judge whether they were accurate enough to have earned a reward



Life



21 February 2022

rat contemplating time

Rats can judge their ability to keep track of the passage of time

Pierre Vericel

Rats can estimate the passage of time and then judge how accurately they did so.

We already know that rats can distinguish between long and short periods of time, but it has been unclear whether they can assess their ability to guess the duration of a given time period.

A study led by Tadeusz Kononowicz at the Polish Academy of Sciences suggests they can.

“When we saw the first results it was disbelief. We were even thinking, are the rats somehow tricking us?” says Kononowicz. “Our results add a whole new richness to the way that rats represent time [in their minds].”

Join us for a mind-blowing festival of ideas and experiences. New Scientist Live is going hybrid, with a live in-person event in Manchester, UK, that you can also enjoy from the comfort of your own home, from 12 to 14 March 2022. Find out more.

Kononowicz and his colleagues trained eight rats to hold down a lever for as close as possible to a target time period of 3.2 seconds, and another eight rats to press and release the lever and then press it again as close as possible to 3.2 seconds later.

The researchers then gave the rats a way to report on their own performance after each of hundreds of trials. This was achieved through the use of two “reward ports”, one on either side of the lever.

The precise leeway each rat was given for its timekeeping during the testing depending on its performance during its training. If the animal was judged to be close to the target time of 3.2 seconds – within about 250 milliseconds, on average – it had the option of poking its nose into the left port to receive two food pellets. There were no food pellets in the right port.

However, if the rat was judged less precise with its timing – if it was off by around 500 milliseconds, on average – the left port no longer delivered a reward. But the rat could poke its nose into the right port to receive one food pellet.

By tracking the rats’ port choices after each test, the team found that the animals in both groups learned to judge their accuracy on the lever test. Rats that had been precise enough with their timing approached the left port for a large reward more than 60 per cent of the time. Those that had been less precise approached the right port for a small reward more than 60 per cent of the time. This suggests the rats could self monitor the size of their temporal errors.

“This study carries our understanding of rats’ timing ability to a whole new level by showing that not only do rats represent time [in their mind], but they also monitor the degree of errors,” says Fuat Balci at Koç University in Turkey.

There was always a possibility that rats would simply approach the port they had been rewarded from most frequently in recent trials. But although this was a minor factor, over the course of the experiment, it was the accuracy of the most recent interaction with the lever that made the largest contribution to a rat’s decision about which port to approach.

“It turned out to be even more interesting than I had originally imagined. Rats kept track of which port they tended to get more rewards… but they paid the most attention to their error of judgement in the current trial,” says Kononowicz.

Next, the team hopes to explore the neural mechanisms behind such self-monitoring behaviour. This could shed light on why the rats cannot use this ability to address their error during the test.

Journal reference: PNAS, DOI: 10.1073/pnas.2108850119

More on these topics:

[ad_2]

Source link

Advertisement

spot_img

How to convert a...

Whether you’re more comfortable working in PowerPoint or...

When To Stop Watering...

You can stop watering new grass seed daily...

Senate Preps for Hearings...

Washington —  On Monday, the U.S. Senate Judiciary Committee...

What DisplayPort’s new Ultra-High...

The Video Electronics Standards Association (VESA) has announced...

How to convert a Word document to a PowerPoint presentation

Whether you’re more comfortable working in PowerPoint or you’d like to present the content of your Word document in a different way, we’ve...

When To Stop Watering New Grass Seed 2022

You can stop watering new grass seed daily once it has germinated and the grass blades measure to about 1 inch. This should...

Senate Preps for Hearings on Biden’s Ground-Breaking Supreme Court Pick 

Washington —  On Monday, the U.S. Senate Judiciary Committee will begin four days of hearings on the nomination of Judge Ketanji Brown Jackson to...

What DisplayPort’s new Ultra-High Bit Rate (UHBR) certification means to you

The Video Electronics Standards Association (VESA) has announced a new DisplayPort certification called Ultra-High Bit Rate (UHBR) for DisplayPort 2.0. It establishes two...

Discover the best ways to earn passive income in 2022 with this $20 bundle

If you’re trying to get rich working for someone else, then the best of luck to you. From a practical sense, the only...
Previous articleVOA Newscasts
Next articleVOA Newscasts