Mind-Wandering 3

Last registered on June 15, 2022


Trial Information

General Information

Mind-Wandering 3
Initial registration date
June 09, 2022

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
June 15, 2022, 10:13 AM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.


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Primary Investigator

Boston College

Other Primary Investigator(s)

PI Affiliation
Ohio State
PI Affiliation

Additional Trial Information

On going
Start date
End date
Secondary IDs
Prior work
This trial is based on or builds upon one or more prior RCTs.
This project investigates fundamental economic questions about mind-wandering.
Note this is connected to AEARCTR-0008811 and AEARCTR-0009550.
External Link(s)

Registration Citation

Coffman, Lucas, Hannu Kivimaki and Ian Krajbich. 2022. "Mind-Wandering 3." AEA RCT Registry. June 15. https://doi.org/10.1257/rct.9568
Experimental Details


In "Mind-Wandering 2", we stated
We vary (but do not include every possible cell; details below)
The costs of unintentional mind-wandering
Whether there is a working-memory burdensome task
Whether there is a reminder of the penalties after the working-memory task
Whether the working-memory task is at the beginning or 2/3 of the way through the study
Whether the task is fun

We will be adding that we vary the cost of intentional mind-wandering.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Same as before.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
The experiment measures whether a subject is on task using a sustained attention to response task: Words flash on the screen one-at-a-time, and every so often, the sequence stops. At this point, the participant is required to recall what the most recent word that was shown, choosing from four options. Every time they provide an incorrect answer or the answer is too late, they have to do additional tasks to earn their payment.
Experimental Design Details
Not available
Randomization Method
Randomization is done within the Qualtrics survey, according to prescribed ratios.
Randomization Unit
Individual level
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
Sample size: planned number of observations
We will be collecting data as before, in batches of 50 per arm, until the standard error of the treatment effect being tested is below 0.16. The two baseline conditions (1 and 2 in the previous registration) will be done throughout for comparison.
Sample size (or number of clusters) by treatment arms
See above.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Boston College Institutional Review Board
IRB Approval Date
IRB Approval Number