I need to randomly present 21 consonents in a sequence which consists of 48 trials
Does that mean on each trial you will have a vector of 21 consonents all visible in a row?
My instructions are to ensure that a 'target letter' (a letter that matches the letter that was shown immediately before) occurs on roughly 33% of trials within one sequence.
So, between trials you are displaying a single random target letter that changes for each trial and on 33% of the trials at least one of the 21 consonents will contain that letter. On the other trials, the target letter will not be part of the 21 consonents, right?
How I imagine it, a trial would look like this:
- Flash target letter: Q
- Show 21 consonent sequence: SHTRPMNZRRTLKGGGGSSSS (does not contain Q)
- Flash target letter: H
- Show 21 consonent sequence: YYYYYHHHHNNNRRRLLLPPP (does contain H)
- repeat until there has been 48 trials.