Table 4.

Category C: mutual awareness of specific aspects of the interaction being the object of joint attention.

Trial ID	First-person report
E2T10Pa	We exchanged patterns so it was clear it was him.
E2T10Pb	Found object that responded to my taataa, stop, taa-taa, etc.
E1T9Pa	I think there was a turn-taking-like communication.
E1T10Pa	It looks like we've established a way to communicate.
E10T14Pb	The rhythm of touching was alternately exchanged.
E11T3Pb	I made “zu-zu-zu” by moving left and right and stopped. The partner moved in the same way and I felt “zu- zu- zu-”
E11T11Pa	I thought we made a conversation.
E17T13Pa	It did not cling but I felt that the partner sent the “zu-zu” signal.
E16T11Pb	The partner synchronized with time gaps that I sent.
E14T4Pa	I felt the partner imitated me.

Ten exemplary first-person reports (emphasis added).