2.3. Reaction time tasks
Two reaction time taskswere used. Thesewill be referred to
as the Numbers reaction time box and the Lights reaction time
box. Simple Reaction Time (SRT) and four-Choice Reaction
Time (CRT)means and standard deviations were measured for
each participant on both tasks. In the SRT, participants had to
press a button in response to a single stimulus. In the CRT, there
were four stimuli and participants had to press a button that
corresponded to the correct response. For both reaction time
tasks, the SRT involved eight practice trials and twenty test
trials. The CRT for both tasks involved eight practice trials and
forty test trials. Subjects undertook a third reaction time task,
reported by Deary et al. (2011), but it is not reported further
here.