摘要:Joint attention occurs when two subjects focus on the same object at once and the event is cognitively open . There are two approaches to this matter: according to the first one, each subject knows that the other is perceiving the same thing and is, therefore, a co-perceiver. The second approach highlights the fact that the subjects know that the object is being perceived by both of them, and explains what it means for an object to be perceived as perceptually shared. The article analyzes the reasons supporting the first approach in order to show that it is misleading, and it provides grounds to validate the second approach. The answer to cognitive openness paves the way for future research on joint attention.