How people read concept maps in the context of a semantically meaningful task?

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