The crossed-hands deficit in temporal order judgments occurs for present, future, and past hand postures

Knut Drewing, Friederer Hartmann, Jean Vroomen

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When people judge the temporal order (TOJ task) of two tactile stimuli at the two hands while their hands are crossed, performance is much worse than with uncrossed hands [1]. This crossed-hands deficit is widely considered to indicate interferences of external spatial coordinates with body-centered coordinates in the localization of touch [2]. Similar deficits have also been observed when people are only about to move their hands towards a crossed position [3]-[5], suggesting a predictive update of external spatial coordinates. Here, we extend the investigation of the dynamics of external coordinates during hand movement. Participants performed a TOJ task while they executed an uncrossing or a crossing movement, and during presentation of the TOJ stimuli the present posture of the hands was crossed, uncrossed or in-between. Present, future and past crossed-hands postures decreased performance in the TOJ task, suggesting that the update of external spatial coordinates of touch includes both predictive processes and processes that preserve the recent past. In addition, our data corroborate the flip model of crossed-hands deficits [1], and suggest that more pronounced deficits come along with higher time requirements to resolve interferences.
Original languageEnglish
Publication statusPublished - 2019
Event2019 IEEE World Haptics Conference (WHC) - Tokyo, Japan
Duration: 9 Jul 201912 Jul 2019


Conference2019 IEEE World Haptics Conference (WHC)
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