This study by J. D. Dodson investigates the relationship between the strength of a stimulus and the rapidity of habit formation in kittens. The experiment uses a setup similar to one previously used with mice, where kittens are trained to choose between light and dark boxes. If they enter the dark box, they receive an electric shock. The apparatus includes a nest box, an entrance chamber, and two electric boxes connected to a constant electric current. The kittens are given ten tests per day until they correctly choose the light box for three consecutive days. Three sets of experiments are conducted: 1. **Medium and Strong Stimuli (set 1)**: Medium stimuli (2.5 amperes) took an average of 82.5 trials, while strong stimuli (3.5 amperes) took 107.5 trials. 2. **Less Difficult Discrimination (set 2)**: Medium stimuli took 60 trials, and strong stimuli took 55 trials. 3. **Fairly Easy Discrimination (set 3)**: Medium stimuli took 75 trials, and strong stimuli took 35 trials. The results show that: 1. The kittens took fewer trials to form the habit under easier conditions. 2. The painfulness of the electrical stimulus influenced habit formation, especially under difficult visual discrimination conditions. 3. Medium stimuli were more effective under difficult discrimination, while stronger stimuli were less effective under easier conditions. These findings align with previous studies on the dancing mouse and provide insights into the relationship between stimulus strength and habit formation in animals.This study by J. D. Dodson investigates the relationship between the strength of a stimulus and the rapidity of habit formation in kittens. The experiment uses a setup similar to one previously used with mice, where kittens are trained to choose between light and dark boxes. If they enter the dark box, they receive an electric shock. The apparatus includes a nest box, an entrance chamber, and two electric boxes connected to a constant electric current. The kittens are given ten tests per day until they correctly choose the light box for three consecutive days. Three sets of experiments are conducted: 1. **Medium and Strong Stimuli (set 1)**: Medium stimuli (2.5 amperes) took an average of 82.5 trials, while strong stimuli (3.5 amperes) took 107.5 trials. 2. **Less Difficult Discrimination (set 2)**: Medium stimuli took 60 trials, and strong stimuli took 55 trials. 3. **Fairly Easy Discrimination (set 3)**: Medium stimuli took 75 trials, and strong stimuli took 35 trials. The results show that: 1. The kittens took fewer trials to form the habit under easier conditions. 2. The painfulness of the electrical stimulus influenced habit formation, especially under difficult visual discrimination conditions. 3. Medium stimuli were more effective under difficult discrimination, while stronger stimuli were less effective under easier conditions. These findings align with previous studies on the dancing mouse and provide insights into the relationship between stimulus strength and habit formation in animals.