Files are as follows.
Data from Experiment 1
Columns are as follows
id: participant identifier
trial: trial number
stim: stimulus identifier
price: true price of the presented stimulus
judgment: judged price
rt: approximate time, in milliseconds, between stimulus onset and entry of judgment. Values are unlikely to be accurate. Participants were under no time pressure.
missing: A 1 in this columns indicates that the response was excluded
from the analyses. Only two trials were excluded: one because the
participant reported making a mistake; another because the value was
so large as to be judged an outlier, almost certainly resulting from
mis-typing.
Data from Experiments 2a and 2b
Columns are as follows.
feedback: 0 = no feedback (Expt 2A), 1 = feedback (Expt 2B)
id = participant identifier for the relevant experiment. Note that the participants in Expt 2A and Expt 2B were different people, but in both cases they are numbered 1-28.
sex: female=0, male=1
age: age in years
hand: 0=right-handed, 1=left-handed
uk: 0 = participant is from the United Kingdom. Note that all participants had been resident in the UK for at least the past 3 years.
topshop: Had the participant ever visited the shop/website of the shop from which the stimuli were taken? 0 = no, 1=yes.
time: participants’ estimate of time since last visit to the store/website, converted into days – probably not reliable.
block: Trial block. First (8 trials) was practice.
trial: trial number
stim: stimulus identifier
price: price, in pounds sterling, of the stimulus
judgment: participants' judgment of the price. NA means the participant failed to make a response in the allotted time.
rt: Approximate time (in ms) from stimulus offset to entry of response. Values are unlikely to be very accurate. If the participant failed to enter a response in the 3-s window, RT is entered as 0.
missing: A 1 in this columns indicates that the trial was excluded from the analyses. This may be because no response was made, because the participant reported after the experiment that they had made a mistake on a particular trial, or because the judgment was extreme and deemed to be an outlier, perhaps resulting from mis-typing etc.