1. COUNTERBALANCING

2. Today – Thu 2/19 Lecture on Counterbalancing
Methods checkup / Draw out your predictions
Who is submitting Methods?
Next class: Ethics approval, finalize materials

3. COUNTERBALANCING Applies to the within subjects variable
Different forms of counterbalancing will be used depending on how you are manipulating the within-subjects variable
Some groups may have to use more than one!

4. Three types of counterbalancing
Condition Order
Materials Order
Item Selection
Cognitive Psychology

5. 1. Condition Order: What’s the problem?
Music
No Music

6. Condition order: Solution (p.266-272)
Different participants undergo conditions in different order
Conditions are balanced with respect to time
Half of the participants get condition 1 then condition 2
Other half of the participants get condition 2 then condition 1
Music
No Music
30 participants
No Music
Music
30 participants

7. 2. Materials Order: What’s the problem?
Reading
Flashcards
30 participants
Story A
Story B
Flashcards
Reading
30 participants
Story B
Story A

8. Materials Order: What’s the problem?
Reading
Flashcards
30 participants
Story A
Story B
Flashcards
Reading
30 participants
Story A
Story B

9. Materials Order: Solution
Reading
Flashcards
15 participants
Story A
Story B
If you have two sets of materials:
You have to make sure that the materials are rotated so that:
the same materials are not always paired with the same condition
the same materials are not always paired with the same time
Flashcards
Reading
15 participants
Story A
Story B
15 participants
Reading
Flashcards
Story B
Story A
15 participants
Flashcards
Reading
Story B
Story A

10. Ballet Tango Salsa Hip hop Jazz Waltz Tap Swing Ballroom Modern
3. Item Selection
Ballet Tango Salsa Hip hop Jazz Waltz Tap Swing Ballroom Modern
Participants study half the items
At test, all items appear
Participants have to say which were studied
Within-subjects IV: some items on the test are “old”, some items are “new”
These are dances, from most to least common
Cognitive Psychology

11. Item Types What’s the problem?
Ballet Tango Salsa Hip hop Jazz Waltz Tap Swing Ballroom Modern
OLD
NEW
Cognitive Psychology

12. Item Types What’s the problem?
30 participants
30 participants
Ballet Tango Salsa Hip hop Jazz Waltz Tap Swing Ballroom Modern
OLD
NEW
NEW
OLD
Cognitive Psychology

13. Ballet Tango Salsa Hip hop Jazz Waltz Tap Swing Ballroom Modern
Item Types: Solution
30 participants
30 participants
Ballet Tango Salsa Hip hop Jazz Waltz Tap Swing Ballroom Modern
Cognitive Psychology