Stroop task (easy translatable, great for student projects)

options
  background color grey

# table columns:
# 1) The word as shown on screen. You can change this to different languages
# 2) We use a number for colors, 1=red, 2=green, 3=blue, 4=white
# 3) 1=congruent (word meaning matches color). 2=incongruent (no match)
#
# NOTE: the textcolor (column 2) is the same as the required key

table stroop
  "RED"     1 1 ## red congruent
  "RED"     1 2 ## red incongruent
  "GREEN"   2 1 ## green congruent
  "GREEN"   2 2 ## green incongruent
  "BLUE"    3 1 ## blue
  "BLUE"    3 2 ## blue
  "YELLOW"  4 1 ## yellow
  "YELLOW"  4 2 ## yellow

fonts
  normal arial 20
  big arial 80

part what_should_be_pressed
    font normal
    if &textcolor == 1
      show text "You should have pressed the R key" 0 100
      show text "because the ink color of the word was RED" 0 150
    fi
    if &textcolor == 2
      show text "You should have pressed the G key" 0 100
      show text "because the ink colour of the word was GREEN" 0 150
    fi
    if &textcolor == 3
      show text "You should have pressed the B key" 0 100
      show text "because the ink colour of the word was BLUE" 0 150
    fi
    if &textcolor == 4
      show text "You should have pressed the Y key" 0 100
      show text "because the ink colour of the word was YELLOW" 0 150
    fi

task stroop
  keys r g b y  ## you can change this to different buttons depending on language
  delay 500
  show rectangle 0 0 10 30 ## part of fixation point
  show rectangle 0 0 30 10 ## part of fixation point
  delay 200
  clear 1 2
  # ------------------------------------------------------
  # if it is congruent, textcolor is same as textname
  if @3 == 1
    set &textcolor @2
  else
    # if it is incongruent, textcolor is different
    # choose a random textcolor other than @2 (its own color)
    set &&colorrange 1 2 3 4
    set &&colorrange remove position @2
    set &textcolor &&colorrange use random
  fi
  #
  font big
  if &textcolor == 1
    show text @1 0 0 red
  fi
  if &textcolor == 2
    show text @1 0 0 green
  fi
  if &textcolor == 3
    show text @1 0 0 blue
  fi
  if &textcolor == 4
    show text @1 0 0 yellow
  fi
  ## the 5000 is the maximum time
  readkey &textcolor 5000
  clear -1
  if STATUS == CORRECT
    show text "Correct"
    delay 500
    clear -1
  fi
  if STATUS == WRONG
    show text "Wrong key"
    part what_should_be_pressed
    delay 5000
    clear screen
  fi
  if STATUS == TIMEOUT
    show text "Too slow"
    part what_should_be_pressed
    delay 5000
    clear screen
  fi
  delay 500
  save BLOCKNUMBER RT STATUS @1 @2 @3 &textcolor

task instruction
  keys space
  font normal
  text align left
  show text "In this task, do the following." -300 -250
  show text "Respond with the keys R, G, B, or Y" -300 -200
  show text "to the ink (font) color of the words." -300 -150
  show text "Respond to words in a RED font with the R" -300 -100
  show text "Respond to words in a GREEN font with the G" -300 -50
  show text "Respond to words in a BLUE font with the B" -300 0
  show text "Respond to words in a YELLOW font with the Y" -300 50
  show text "Press SPACE to continue" -300 150 yellow
  readkey 1 99999
  clear screen
  show text "Thus:" -300 -250
  show text "If you see the word" -300 -200
  show text "RED" -300 -150 green
  show text "you press the key G" -300 -100
  show text "because the ink (font) color of the letters is GREEN." -300 -50
  show text "Even when the meaning of the word says something else," -300 0
  show text "you still need to respond to the color of the letters." -300 50
  show text "Press space bar to try yourself" -300 200 yellow
  readkey 1 99999

block instruction ## this is block number 1
  message "STROOP task, press the SPACE bar to start"
  task instruction 1

block training ## this is block number 2
  message "Now try this yourself."
  task stroop 8

block real ## this is block number 3
  message "Now that you are trained, real data collection begins"
  task stroop 80 ## 8 * 5
  message "Well done"
  feedback
    text -350 0  "Your speed in correct trials"
    set &StroopCon mean c2 ; select c1 == 3 && c6 == 1 && c3 == 1
    set &StroopInc mean c2 ; select c1 == 3 && c6 == 2 && c3 == 1
    set &StroopEffect expression &StroopInc - &StroopCon
    text -350 50  &StroopCon ; prefix "congruent:   " ; postfix " ms"
    text -350 100 &StroopInc ; prefix "incongruent: " ; postfix " ms"
    text -350 150 &StroopEffect ; prefix "Your Stroop effect is incongruent minus congruent: " ; postfix " ms"
    text -350 200 "Press space key to end"
  end