first_fixation_duration

pymovements.measure.reading.first_fixation_duration(fixations: DataFrame) → DataFrame

Compute the duration of the first fixation during first pass only (FFD).

Parameters:

fixations (pl.DataFrame) – Fixation table containing at least trial, page, word_idx, is_first_pass, onset, and duration columns.

Returns:

DataFrame with columns trial, page, word_idx, and FFD.

Return type:

pl.DataFrame