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It is part of the data associated with the paper 'Motion signal and the perceived positions of moving objects'.
qpdat
An object of class grouped_df (inherits from tbl_df, tbl, data.frame) with 6240 rows and 8 columns.
grouped_df
tbl_df
tbl
data.frame
Linares, D., L<U+00F3>pez-Moliner, J., & Johnston, A. (2007). Motion signal and the perceived positions of moving objects. Journal of Vision, 7(7), 1.