AX Continuous Performance Test (AX-CPT)

## AX-CPT
## there are 4 types of trials
## AX : m after cue "a" and "c" after probe "x"
## BX : any letter except A followed by x (press m m)
## AY : A followed by any except X (press m m)
## BY : any pair except A and X (press m m)

bitmaps
  instructions1
  instructions2

fonts
  regularfont arial 20
  letterFont courier 60

## this table sets the frequency. A common setup is to have 70% AX trials, and 10% for other trial types

table conditions
  "AX" 2 # only in AX trials, the second letter is the c, which is the second letter in the keys line below
  "AX" 2
  "AX" 2
  "AX" 2
  "AX" 2
  "AX" 2
  "AX" 2
  "BX" 1 # in other trials, the second letter is letter 1 (the m)
  "BY" 1
  "AY" 1

part countDownToContinue
  font regularfont # makes next show text large
  show rectangle 0 0 800 500 yellow
  show text %feedback1 0 -50 black
  show text %feedback2 0 0 black
  show text %feedback3 0 50 black
  set $delayCounterInterval 500
  set $countDown 20
  while $countDown > 0
    show text $countDown 0 100   black
    delay $delayCounterInterval
    clear -1
    set $countDown decrease
  while-end
  show text "Concentrate. Press a key to continue with the task" 0 200 black
  readkey 3 99999

task axcpt
  keys m c space
  # note, we excluded C and M because they are used for the keys, and we excluded K as in original study
  set %%otherLetters "B" "D" "E" "F" "G" "H" "I" "J" "L" "N" "O" "P" "Q" "R" "S" "T" "U" "V" "W" "Y" "Z"
  set %feedback1 " "
  set %feedback2 " "
  set %feedback3 " "
  # -- first select letters
  if @1 = "AX"
    set %letter1 "A"
    set %letter2 "X"
    set %feedback2 "If you see a blue A followed by a white X"
    set %feedback3 "then press C"
  fi
  if @1 = "AY"
    set %letter1 "A"
    set %letter2 %%otherLetters use random
    set %feedback2 "If you see a blue A followed by a letter other than X"
    set %feedback3 "then press M"
  fi
  if @1 = "BX"
    set %letter1 %%otherLetters use random
    set %letter2 "X"
    set %feedback2 "If you see a blue letter that is not an A"
    set %feedback3 "followed by an X, then press M"
  fi
  if @1 = "BY"
    set %letter1 %%otherLetters use random
    set %%tmpLetters %%otherLetters # make copy of otherLetters
    set %%tmpLetters remove value %letter1 # this prevents repeat of same letter in BY trials
    set %letter2 %%tmpLetters use random
    set %feedback2 "If you see a blue letter that is not an A"
    set %feedback3 "followed by a letter other than X, then press M"
  fi
  ## -- now show fixpoint made from two rectangles
  show rectangle 0 0 5  30 white
  show rectangle 0 0 30 5 white
  delay 200
  clear -1 -2
  font letterFont # makes next show text large
  show text %letter1  0 0    0 255 255 # 0,255,255 is cyan
  readkey 1 500 # response window 1: 500ms with cue; always need to press m to first cue letter
  if STATUS = TIMEOUT # it can be timeout, because this is first part of response window (with letter present)
    clear -1
    show rectangle 0 0 5 30 white
    show rectangle 0 0 30 5 white
    readkey 1 500 # response window 2 for the cue, but now the cue not shown
    clear -1 -2 # remove fixpoint that was shown during second part of response window
    set $rt1 expression 500 + RT
  else
    clear -1
    set $rt1 RT
  fi
  set $status1 STATUS
  if STATUS = WRONG # if people pressed C instead of M to the cue
    set %feedback1 "If you see a blue letter, you always need"
    set %feedback2 "to press the letter M on the keyboard"
    set %feedback3 " "
    part countDownToContinue # note that call also changes STATUS
  fi
  if STATUS = TIMEOUT
    set %feedback1 "You failed to respond to the blue letter WITHIN 1 second."
    set %feedback2 "If you see any blue letter,"
    set %feedback3 "always press the letter M on the keyboard."
    part countDownToContinue # note that call also changes STATUS
  fi
  #
  #-- first part done
  #
  if $status1 = CORRECT # we only continue if response to cue was correct
    # -------------------------------------------------------------------------
    # In this case, trial continues with further wait and second letter
    # -------------------------------------------------------------------------
    show rectangle 0 0 5  30 white # fixpoint
    show rectangle 0 0 30 5 white  # fixpoint
    delay 3900
    clear -1 -2
    ## -- now show for the second letter and wait 1000 ms for response
    show text %letter2
    readkey @2 1000
    clear -1
    if STATUS = TIMEOUT
      set %feedback1 "You responded to the blue letter, but not to the white letter."
      part countDownToContinue
    fi
    if STATUS = WRONG
      set %feedback1 "You responded correctly to the blue letter, but not to the white one."
      part countDownToContinue
    fi
    set $rt2 RT
    set $status2 STATUS
  fi
  clear screen
  delay 1000 ## added some break
  #--so far, we had responses for part of the trials
  #  good to have complete status
  #  here 1 means correct, 0 means wrong
  if $status1 = 1 and $status2 = 1
    set $trialstatus 1
    set &correctInRowCounter increase # count up to 10 for practiseblock
  else
    set &correctInRowCounter 0
  fi
  save BLOCKNAME $trialstatus %letter1 %letter2 $rt1 $status1 $rt2 $status2 &correctInRowCounter
  if &practiseMode = 1 and &correctInRowCounter >= 10
    end tasklist # this ends practise block after 10 trials correct in a row
  fi

block training
  set &practiseMode 1
  message instructions1
  task axcpt 50 # runs up to 50

block realdata
  set &practiseMode 0
  message instructions2
  task axcpt 150