Fixation identification in centroid versus start-point modes using eye-tracking data

Falkmer, Torbjörn (author): Jönköping University,Östergötlands Läns Landsting,Linköpings universitet,Hälsouniversitetet,Rehabiliteringsmedicin,Habiliteringen: Barn- och ungdomshabiliteringen, LSS Råd och stöd,HHJ, Avdelningen för rehabilitering,HHJ. Åldrande - livsvillkor och hälsa

Dahlman, Joakim (author): Linköpings universitet,Rehabiliteringsmedicin,Tekniska högskolan

Dukic, Tania (author): Swedish National Road and Transport, Research Institute, VTI, Gothenburg, Sweden

Bjällmark, Anna (author): KTH,Medicinsk teknik,School for Technique and Health, KTH, Stockholm, Sweden

Larsson, Matilda (author): KTH,Medicinsk teknik,School for Technique and Health, KTH, Stockholm, Sweden

(creator_code:org_t)

Sage Publications, 2008
2008
English.
In: Perceptual and Motor Skills. - : Sage Publications. - 0031-5125 .- 1558-688X. ; 106:3, s. 710-724

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Abstract Subject headings

Fixation-identification algorithms, needed for analyses of eye movements, may typically be separated into three categories, viz. (i) velocity-based algorithms, (ii) area-based algorithms, and (iii) dispersion-based algorithms. Dispersion-based algorithms are commonly used but this application introduces some difficulties, one being optimization. Basically, there are two modes to reach this goal of optimization, viz., the start-point mode and the centroid mode. The aim of the present study was to compare and evaluate these two dispersion-based algorithms. Manual inspections were made of 1,400 fixations in each mode. Odds ratios showed that by using the centroid mode for fixation detection, a valid fixation is 2.86 times more likely to be identified than by using the start-point mode. Moreover, the algorithm based on centroid mode dispersion showed a good interpretation speed, accuracy, robustness, and ease of implementation, as well as adequate parameter settings.

By the author/editor: Falkmer, Torbjör ...; Dahlman, Joakim; Dukic, Tania; Bjällmark, Anna; Larsson, Matilda

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Medical Engineer ...; and Medical Laborato ...

By the university: Royal Institute of Technology; Linköping University; Jönköping University

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