how people read concept maps in the context of a semantically meaningful task?
DESCRIPTION
Introduction. Processing Verbal Information in Concept Maps. How people read concept maps in the context of a semantically meaningful task?. Eye tracking. How do we see?. Fixations – visual gaze on a single location; 200-350 ms Saccades – fast movement of the eye - PowerPoint PPT PresentationTRANSCRIPT
Introduction
Processing Verbal Information in Concept Maps
How people read concept maps in the context of a semantically meaningful task?
Eye tracking
How do we see?
Fixations – visual gaze on a single location; 200-350 ms
Saccades – fast movement of the eye
Constant state of vibration at a rate of 30-70 Hz
Eye tracking
How does it work?
Infrared light source to illuminate the eye
Sensor to capture a reflection of the user’s eye
Calculating the gaze
Eye tracking
Tobii T120
Data rate 120Hz
Accuracy 0.5 degrees
Drift 0.1 degrees
Head movement box 30 X 22 cm at 70 cm
Blink tracking recovery max 8 ms
Eye tracking
Tobii Data Measure
Pupil size Cognitive Load
Fixations/Observations Cognitive processing/Attention
Gaze Pattern (sequence) Self-regulation
Eye tracking
Data output
Timestamp - in milliseconds
GazePointXRight - horizontal screen position of gaze
Event – automatic and logged mouse clicks and keys
Data1 – Data field for the event
Example of Input
Area of Interest - AOI
Eye trackingReplay
Eye tracking
Data output/AOI
Fixation length - in milliseconds
Fixations – number in AOI
Total time – in AOI in milliseconds
Time to first fixation – in milliseconds
Eye tracking
Visualizations
Eye tracking
Visualizations
Eye trackingVisualizations
Eye tracking
Logged data
Experimental Design
Concept Maps
Task
Strings
Transition Matrix
Map A
Look “next”
Connected
Go to node with arrowheads
Go to node with reverse arrowheads
Distance
Size of node
Concept Map “Model”
Concept Map “Model”
Assume:
Every sequence starts at N
Track each sequence until Terminal Event
Keep track of whether it was a First Visit or a Return Visit
Concept Map “Model”
Assume:
Every sequence starts at N
Track each sequence until Terminal Event
Keep track of whether it was a First Visit or a Return Visit
Concept Map “Model”
Forward Fixation NLF
Backwards Fixation NCB
Incomplete FF NL
Incomplete BF NC
Immediate Retrospection (Node) NXN
IR (Link) NYN
IR (Incomplete FF) NLN
IR (Incomplete BF) NCN
Delayed IRF NLFN or NLFN
Delayed IRB NCBN or NCBCN