I vaguely remember a study claiming that children heard the word "no" a lot more often than the word "yes". I could not find it today; I did find this claim
A UCLA survey from a few years ago, reported that the average one year old child hears the word, ‘No!’ more than 400 times a day!
I could not find this study either, and the post has no reference.
Does this claim have a solid academic backing?
Note: migrated from Parenting.