Extract saccades using an algorithm proposed by Nyström and Holmqvist (2010) doi:10.3758/BRM.42.1.188 .
Source:R/method_nh.R
method_nh.Rd
Extract saccades using an algorithm proposed by Nyström and Holmqvist (2010) doi:10.3758/BRM.42.1.188 .
Arguments
- x
Gaze x coordinate, _arbitrary units_ as threshold velocity is computed in units of standard deviation.
- y
Gaze y coordinate, _arbitrary units_ as threshold velocity is computed in units of standard deviation.
- vel
Velocity
data.frame
with columnsx
,y
,amp
.- acc
Acceleration
data.frame
with columnsx
,y
,amp
.- sample_rate
Sample rate in Hz.
- trial
Trial id, so that trial borders are respected when computing velocity and saccades.
- options
Named list with method options. See details for further information.
Details
Method options, please refer to Nyström and Holmqvist (2010) for details on parameters and the rationale for default values.
nh_sg_filter_order
Order of Savitzky-Golay filter. Defaults to2
.nh_max_velocity
Maximal physiologically plausible velocity in °/s. Defaults to1000
.nh_max_acceleration
Maximal physiologically plausible acceleration in °/s². Defaults to100000
.nh_initial_velocity_threshold
Initial velocity threshold in °/s. Defaults to100
.