PMID- 6733193
OWN - NLM
STAT- MEDLINE
DCOM- 19840813
LR  - 20191023
IS  - 0301-0511 (Print)
IS  - 0301-0511 (Linking)
VI  - 18
IP  - 2
DP  - 1984 Mar
TI  - Eye-movements in a two-dimensional plane: a method for calibration and analysis 
      using the vertical and horizontal EOG.
PG  - 149-60
AB  - A method for calibration, orthogonalization and standardization of eye movements 
      is described. The method is based on linear transformation of the horizontal and 
      vertical EOG. With this method it is possible to measure the locus of eye 
      fixation on a TV screen and its associated fixation time. Because of the used 
      time constant (TC) of 36 sec, subjects must look at the centre of the TV screen 
      or at random places on the screen during the interstimulus intervals (ISIs). For 
      the EOG registration pre-amplifiers with a long TC were used to cut off slow 
      changes in polarization caused by the electrode-electrolyte combination. In the 
      calibration procedure only four orthogonal stimulus points were used. In an 
      experiment to evaluate this method, subjects had to fixate letters on a TV screen 
      in 12 different pre-determined positions. The distance between the measured locus 
      of fixation and the coordinates of the stimulus was measured. The mean horizontal 
      errors ranged from 1.4-2.2 degrees of arc and the mean vertical errors from 
      2.4-3.8 degrees of arc across subjects. It was concluded that accuracy was within 
      acceptable limits, despite the fact that eye movement behaviour during the ISI 
      was free. It was shown that the method is insensitive to non-orthogonality of the 
      vertical and horizontal EOG. Calibration and transformation can be done by any 
      real time computer system. The method is suitable for measuring, e.g. the visual 
      orienting reaction (VOR), and it can also be applied in event related potential 
      (ERP) studies where ocular fixation is used.
FAU - Woestenburg, J C
AU  - Woestenburg JC
FAU - Verbaten, M N
AU  - Verbaten MN
FAU - Slangen, J L
AU  - Slangen JL
LA  - eng
PT  - Journal Article
PL  - Netherlands
TA  - Biol Psychol
JT  - Biological psychology
JID - 0375566
SB  - IM
MH  - Adult
MH  - Electrooculography/*methods
MH  - *Eye Movements
MH  - Female
MH  - Fixation, Ocular
MH  - Humans
MH  - Male
MH  - Mathematics
EDAT- 1984/03/01 00:00
MHDA- 1984/03/01 00:01
CRDT- 1984/03/01 00:00
PHST- 1984/03/01 00:00 [pubmed]
PHST- 1984/03/01 00:01 [medline]
PHST- 1984/03/01 00:00 [entrez]
AID - 0301-0511(84)90017-6 [pii]
AID - 10.1016/0301-0511(84)90017-6 [doi]
PST - ppublish
SO  - Biol Psychol. 1984 Mar;18(2):149-60. doi: 10.1016/0301-0511(84)90017-6.