Changes

* place 2 identical toys (i.e. 2 x kong or 2 x jack) in corners 20cm away from each wall

* place 2 identical toys (i.e. 2 x kong or 2 x jack) in corners 20cm away from each wall

* bring rat cage from housing rm BRF169, weigh rat

* bring rat cage from housing rm BRF169, weigh rat

* start video recording on iMac, place rat in arena for 5 (FIVE) minutes

* start video recording on iMac, place rat in arena for 3 (THREE) minutes

* return to home cage and BRF 169.

* return to home cage and BRF 169.

*wash toys in soapy water and rinse

*wash toys in soapy water and rinse

* place 1 kong and 1 jack in corners 20cm away from each wall

* place 1 kong and 1 jack in corners 20cm away from each wall

* bring rat cage from housing rm BRF169 (don't weigh rat again)

* bring rat cage from housing rm BRF169 (don't weigh rat again)

* start video recording on iMac, place rat in arena for 5 (FIVE) minutes

* start video recording on iMac, place rat in arena for 3 (THEE) minutes

* return to home cage and BRF 169.

* return to home cage and BRF 169.

* repeat for each rat, alternating position of jack and kong.

* repeat for each rat, alternating position of jack and kong.