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People can reliably detect action changes and goal changes during naturalistic perception

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Abstract

As a part of ongoing perception, the human cognitive system segments others’ activities into discrete episodes (event segmentation). Although prior research has shown that this process is likely related to changes in an actor’s actions and goals, it has not yet been determined whether untrained observers can reliably identify action and goal changes as naturalistic activities unfold, or whether the changes they identify are tied to visual features of the activity (e.g., the beginnings and ends of object interactions). This study addressed these questions by examining untrained participants’ identification of action changes, goal changes, and event boundaries while watching videos of everyday activities that were presented in both first-person and third-person perspectives. We found that untrained observers can identify goal changes and action changes consistently, and these changes are not explained by visual change and the onsets or offsets of contact with objects. Moreover, the action and goal changes identified by untrained observers were associated with event boundaries, even after accounting for objective visual features of the videos. These findings suggest that people can identify action and goal changes consistently and with high agreement, that they do so by using sensory information flexibly, and that the action and goal changes they identify may contribute to event segmentation.

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Acknowledgements

The authors would like to thank Michael Goldstein for his input on an earlier version of this manuscript and Joel Cruz for help with data collection. This work was funded by the Cornell University College of Arts and Sciences.

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Correspondence to Khena M. Swallow.

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Open Practices Statement

The data and materials for this experiment will be made available upon reasonable request (participants did not consent to having their data made publicly available). Statistical analyses were performed using publicly available tools, including programs available here: https://github.com/ksasmita/esMethods. The experiment was not pre-registered.

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Su, X., Swallow, K.M. People can reliably detect action changes and goal changes during naturalistic perception. Mem Cogn (2024). https://doi.org/10.3758/s13421-024-01525-8

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  • DOI: https://doi.org/10.3758/s13421-024-01525-8

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