Measurements of eye movements - Tobii

Tobii 1750 consists of a camera filming both eyes and a computer screen. This system calculates where a person is looking on the computer screen with the help of infra red light reflection from the pupil and cornea. The advantage with Tobii is that it measures both eyes and at the same time is not restricting the child’s movements. Just now we have two eye tracking systems from Tobii. These are used to measure the development of object representations and the ability to understand social interactions in normal children and children with autism. 
 

	Facts: Sampling frequency: 50 Hz Principle of measurement: infrared reflection Precision: 0.5 visual angles Resolution: 0.25 visual angles
Study of object representation, the ball rolls behind the occluder and comes out on the other side. When infants can predict where the ball comes out?	The picture shows how 12 months old children are observing the conversation.