HCP-YA Social task stimuli

[ליאור ישראלוב‎]

Hey, 

I have 2 questions regarding the stimuli used in the social task:
1. Were the same stimuli used and presented in the same exact order for each subject?
2. In the downloadable stimuli folder I see 23 video files, yet the protocols mention the usage of only 10 videos (5 in each run). Were the other 13 not used in the study? If so, why?

Thank you!
Lior

[Elam, Jennifer]

Hi Lior,

See this thread: https://groups.google.com/u/0/a/humanconnectome.org/g/hcp-users/c/OM7Uy3jFekE/m/jr45ag0IAgAJ

We used the same stimuli structure for all participants.

From the Reference Manual:

Participants were presented with short video clips (20 seconds) of objects (squares, circles, triangles) that either interacted in some way, or moved randomly on the screen. These videos were developed by either Castelli and colleagues (Castelli et al. 2000) or Martin and colleagues (Wheatley et al. 2007). After each video clip, participants judge whether the objects had a mental interaction (an interaction that appears as if the shapes are taking into account each other’s feelings and thoughts), Not Sure, or No interaction (i.e., there is no obvious interaction between the shapes and the movement appears random). Each of the two task runs has 5 video blocks (2 Mental and 3 Random in one run, 3 Mental and 2 Random in the other run) and 5 fixation blocks (15 seconds each).

References for the Social Cognition Task: Reliable across subjects and robust activation (Castelli et al. 2000; Castelli et al. 2002; Wheatley et al. 2007; White et al. 2011).

The extra videos were from the Castelli and Wheatley studies.

Best,

Jenn

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From: ליאור ישראלוב <liorisr...@gmail.com>
Sent: Thursday, October 30, 2025 10:42 AM
To: HCP-Users <hcp-...@humanconnectome.org>
Subject: [hcp-users] HCP-YA Social task stimuli

 

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