Individualize each mouse in a different cage with new bedding.

Present one cotton swab to the animal for object habituation for 10 min.

Present a second swab impregnated with water for 3 min.

Measure the number of times the animal goes towards the second cotton swab and the time the animal spends sniffing it.

Present a third swab impregnated with lemon essence (Essenciales) for 3 min.

Measure the number of times the animal goes towards the third cotton swab and the time the animal spends sniffing it.

Calculate the discrimination index (DI) according to the formula: (Time exploring lemon essence – Time exploring water) / (Time exploring lemon essence + Time exploring water).