The materials on this page include: (i) the informed consent letter. (ii) the jsPsych code that we are using to run the study. The experiment code is being ran through the website Cognition.run. (iii) both the easy and difficult passages. (iv) the Nelson-Denny Comprehension Questions. (v) the Lay Theories of Willpower, Lay Theories of Mind-Wandering, and Chronotype Questionnaires. **Procedure** *Instructions to Participants*. After providing informed consent, and in congruence with Feng et al (2013), the participants of this replication will be presented with the same definition of mind wandering to read prior to beginning the study. “Mind wandering is a term used to describe what occurs when your attention wanders from a task. Sometimes when your mind wanders, you begin thinking about personal events or concerns rather than your task. At other times, your mind can wander because you are bored or tired and you don’t really know what you’re thinking about; all you know is that your are no longer thinking about your task” Participants will be aware that they will be asked questions in regard to their comprehension of the sentences they will read. They know that each sentence passage will be presented to them one sentence at a time. They know that they will not be able to move backwards once they have progressed to the next sentence or question. We have included all of the same instructions from the original study, although we have re-written some to increase clarity and to reflect the fact that participants are conducting the study online (e.g., instead of saying to ask the researcher if they have questions, participants are instead given the option to see all of the instructions again a second time). *Presentation of Passages.* As in the original study, participants are shown passage sentences one at a time, and press the spacebar to progress. They cannot go backwards, and their time on each sentence is recorded. There are two sets of text passages (see ‘Easy Passages’ & ‘Difficult Passages’) which counterbalanced whether a text was easy or difficult. Set 1 contains the difficult passaged as being odd numbered (passages 1, 3, 5, and 7), while the easy passages being even numbered (passages 2, 4, 6, and 8). Set 2 contains the opposite assignment of passage difficulties. All participants will read four difficult and four easy passages and will be randomly assigned to either Set 1 or 2. All participants will see the eight passages and their contents in the same order as in the Nelson-Denny Reading Comprehension Test. *Mindwandering Probes.* While reading the passages, participants will be periodically interrupted with a thought probe asking if they experienced mind wandering. We have programmed these probes to appear in the exact same places as the original study (i.e., following the same sentences of the passage). “Were you mind wandering when you read the previous sentence?” As per the original study, participants will respond to the thought probe by pressing the “y” (yes) or “n” (no). *Comprehension Questions.* The same comprehension questions from the Nelson-Denny test (see ‘Nelson-Denny Passages with Questions) used in Feng et al (2013), will be presented following the completion of each series of sentences. Following the same manner of presentation as Feng et al (2013), this replication will present all of the comprehension questions associated to a particular passage one at a time. Participants will select the correct answer to the comprehension questions by clicking on the associated radio button. *Extension and Debrief.* After the completion of the procedure under replication, participants will respond to the 'Lay Theories of Mind-Wandering' (Zedelius et al., 2020) and 'Lay Theories of Willpower' (Job et al., 2010) questionnaires and a 5-item measure of chronotype (see ‘Willpower, Mindwandering, and Chronotype Questionnaires’). Participants will also be asked to provide their gender and age. They will then read a short explanation of the study and be thanked for their time and participation.