Stimulus #	Stimulus Type	Duration (sec)
1	Instructions	4.1
2	Facial Affect ID	6
3	Facial Affect ID	6
4	Facial Affect ID	6
5	Facial Affect ID	6
6	Joke	6.5
7	Break	0.7
8	Joint Attention	4.6
9	Joke	6.8
10	Break – blank screen	0.7
11	Social vs Abstract	8
12	Social vs Abstract	6
13	Instructions	4.4
14	Facial Affect ID	6
15	Facial Affect ID	6
16	Facial Affect ID	6
17	Facial Affect ID	6
18	Joke	5.9
19	Break – blank screen	0.7
20	Joint Attention	4.3
21	Joke	7.3
22	Break – blank screen	0.7
23	Social vs Abstract	8
24	Social vs Abstract	6.5
25	Instructions	4.4
26	Joint Attention	3.7
27	Joint Attention	4.5
28	Social vs. Abstract	8
29	Joint Attention	4
30	Joint Attention	4
31	Social vs. Abstract	5.9
32	Naturalistic Scene	12
33	Naturalistic Scene	12
34	Instructions	4.4
35	Naturalistic Scene	10
36	Joint Attention	3.8
37	Naturalistic Scene	7.8
38	Joke	6.7
39	Break - blank screen	0.7
40	Social vs. Abstract	6
41	Naturalistic Scene	7.7
42	Social vs. Abstract	6
43	Naturalistic Scene	10.5

Note. Facial affect ID = side-by-side faces with instructions to look at a specific facial expression. Joke stimuli involved a person telling a corny joke. Social vs. Abstract included half the screen with an abstract shape or numerical representation and the other half with one or more people interacting. Joint attention scenes involved a variety of target and distractor objects with one person pointing toward and/or directing their gaze toward the target objects. Naturalistic scenes involved people interacting in various ways (e.g., having a conversation, playing a board game, entering an elevator, etc.).