The present study investigates the relation between the reading process and text comprehension during naturalistic
text reading. To that end, participants read easy and difficult texts while their eye movements were recorded. After each
reading, participants filled-in comprehension questionnaires. We investigated classical measures of the reading process related
to comprehension (fixation duration, regressive eye movements), as well as power-law scaling in eye movements that are
indicative of degree of cognitive coordination during reading. The results show that text difficulty led to longer fixation durations
and stronger power-law scaling in eye movements. Moreover, the degree of power-law scaling in eye movements was predictive
of text comprehension. In line with previous research on natural text reading that utilized the self-paced reading method, powerlaw
scaling turned out to be a superior predictor of reading comprehension compared to standard measures, suggesting that it
is an effective measure of cognitive performance in complex reading tasks