Flashcards in Case Study 4- Kitten Carousel Deck (21):
By who was this study down by?
In what year?
Hein and held
What was the background? 
1. There is a long debate between Natura Vs Nurture. And it still goes on.
2. Is visual perception learnt of inherited?
3. Many studies believe that for humans and animals to develop their own perception, they need to look at the role of stimuli and the movement around stimuli to develop their own perception.
4. It is also believed that ONE sense is not enough to develop perceptual skills.
What was the aim?
To investigate whether kittens had to see and move to develop skills. Hence depth perception.
What was the IV?
What was the DV ?
Each kitten had a distinctive role, leading to the IV.
1. Self directed movement.
active( allowed to walk around)
passive. ( where kitten was placed in a device and could not walk around).
2. Visual stimulation.
From these two levels, pairs were created and these pairs were called X and Y
DV- the the development of guided behavior.
What were the main three tests?
1. Visually guided paw placement
2. Avoidance of visual cliff
3. Blinking to an approaching object.
'Visually guided paw placement.'
1. Each kitten was held in a researchers hand by the body. Head and body where free to move.
2. Kitten was slowly brought forward and down towards the edge of table.
3. Expected reaction was: KITTEN WOULD EXTEND PAWS TO TOUCH SURFACE.
Procedure of 'Avoidance of visual cliff'
1. Apparatus had DEEP side with a pattern and SHALLOW side with a pattern underneath.
2. All this under glass
3. Expected result: kitten would walk on shallow side and avoid deep side.
Procedure of 'blinking to an approaching object'
1. All kittens were put in a device that was the same as the active kitten.
2. A large sheet of plexiglass was placed between them.
3. Hand would move QUICKLY towards kitten stopping Just before the glass.
4. Kitten was expected to blink
What were the three additional tests.
1. Pupillary reflex
2. Tactual placing response
3 visual pursuit of a moving object.
Procedure of 'pupillary reflex to light'
If light was shown into the eye of kitten, the pupil should shrink
Procedure of 'tactual placing response '
1. Like paw placement test
2. Kitten would want to touch horizontal surface rather than vertical
Procedure of 'pursuit of a moving object'
-if experimenters hand was moved about in front of kitten face, they should follow this movement with their head and eyes.
How many participants were there?
Where did they come from ?
Where they broken down?
10 pairs of kittens, hence in total 20 kittens.
Each pair came from a different litter
All aged between 8-12 weeks old.
Yes, into two groups. X ( 8 pairs) and Y (2 pairs)
At the beginning of kittens life, who were they brought up?
Begin with X group. 
Y group 
X group was reared in darkness until 8-12 weeks old. Were placed in carousel for 3 hours a day.
- had 3 hours of exposure to the pattern of carousel since 2-8 weeks old
- Than had 3 hours a day in the carousel
- kept in dark cages with no light, yet they were with their mother and litter.
What did kittens have to do everyday?
What was done after?
6 assessments every day of paw placement test.
Once they showed ability to paw place, they were tested with VISUAL CLIFF.
During these test, what did researchers do to group X
-kittens were being placed in continuous lit room for 48 hours.
-Each pair was tested again to see how they reacted.
What happened to Group Y
With ACTIVE kittens, they showed paw placement skills, it was tested with visual cliff. And then retested next day.
Passive kittens- did not get lit room, it just carried on with carousel as before, until a total length of 126 hours.
And than did paw placement and visual cliff test
What was proved when tested on visual cliff ?
WHAT happened after 48 hours?
- All active kittens (X and Y) showed normal behavior
-passive kittens did not.
After 48 hours, in normal living of light, all kittens were retested and passed showing no secondary effects of experiment.
In order to develop 'typical perceptual development, kittens need to be able to move around themselves with simultaneous Vidal feed back.
High control as it is a laboratory experiment, hence can be repeated for reliability.
E.g. Amount of time kittens were exposed to carousel light and task.
With these high controls, researchers can be more confident that IV is directly affecting DV