APPENDIX AVI212 Manual de usuario descargar pdf (Pagina 201)

Event Detection

194

Blink Detection

However, the saccade we have found could still be an artifact as a result

of a start or end of a blink. If so, we discard the saccade event and assign

the artificial saccade to a blink. To determine, if this is the case we

evaluate the pupil diameter during the saccade period. If the speed of the

pupil diameter change exceeds an internal threshold value, the saccade

is assumed artificial and part of the blink.

Fixation Detection

Finally, we create a fixation event between the newly and the previously

created blink or saccade.

Parameters

The parameters can be changed in the Adjust Event Detection dialog.

Min. duration: minimum saccade duration in [ms]. If the Auto option is

clicked, the minimum duration varies and is automatically set dependent

on the peak threshold.

Peak threshold: peak velocity threshold in [º/s]

Min. fixation duration: minimum fixation duration in [ms]. All fixations

below the threshold are rejected. The default value is 50 ms.

188

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 257 258

Sin comentarios

APPENDIX AVI212 Manual de usuario Pagina 201