Maya Schipper & Matan Mazor
A series of experiments looking at the effects of factual and counterfactual visibility on confidence in presence and absence.
Data from Exp. 1, including raw behavioural data, parameter estimates and simulated data from the model, is available on OSF.
Raw behavioural data from Exp. 2 is also available on OSF.
These files can be downloaded into their right places by running downloadFromOSF.R from the analysis subdirectory.
A fully reproducible data-to-results-section code, (in R and Rmarkdown), is available in the analysis subdirectory. The directory also includes all pre-registered hypotheses from the two experiments.
You can try Experiment 1 (size) by clicking here
You can try Experiment 2 (prospective confidence) by clicking here
OSF pre-registrations are available for Exp. 1 and Exp. 2.
To ensure preregistration time-locking (in other words, that preregistration preceded data collection), we employed randomization-based preregistration. We used the SHA256 cryptographic hash function to translate our preregistered protocol folder (including the pre-registration document) to a string of 256 bits. These bits were then combined with the unique identifiers of single subjects, and the resulting string was used as seed for initializing the Mersenne Twister pseudorandom number generator prior to determining all random aspects of the experiment, including the order of trials, occluder positions, and random noise in the stimulus itself. This way, experimental randomization was causally dependent on, and therefore could not have been determined prior to, the specific contents of our preregistration document (Mazor, Mazor & Mukamel, 2019).
protocol sum: 5c3ed4305256f8e945a9efec12fe5e6c8a7c1576607c7c32061a0c5a50d82d60
relevant pre-registration lines of code
protocol sum: 7463799c7fd4953c82d6143176f825985aa27ad742e98737d0100adfb758b1d8