saccade_VTI

Use the velocity threshold algorithm from Salvucci &amp; Goldberg (2000) to determine saccadic eye movements.
Returns a summary of the saccades found per trial, including start and end coordinates, timing, duration, mean velocity, and peak velocity.

Enables the automation of actions across the pipeline, including
initial steps of transforming binocular data and gap repair to event-based
processing such as fixations, saccades, and entry/duration in Areas of
Interest (AOIs). It also offers visualisation of eye movement and AOI
entries. These tools take relatively raw (trial, time, x, and y form) data
and can be used to return fixations, saccades, and AOI entries and time spent
in AOIs. As the tools rely on this basic data format, the functions can work
with data from any eye tracking device. Implements fixation and saccade
detection using methods proposed by Salvucci and Goldberg (2000)
<doi:10.1145/355017.355028>.

Tom Beesley

eyetools

Analyse Eye Data

Matthew Ivory

saccade_VTI function

<dl><dt>data</dt>
<dd>A dataframe with raw data (time, x, y, trial) for one participant</dd>
<dt>sample_rate</dt>
<dd>sample rate of the eye-tracker. If default of NULL, then it will be computed from the timestamp data and the number of samples</dd>
<dt>threshold</dt>
<dd>velocity threshold (degrees of VA / sec) to be used for identifying saccades</dd>
<dt>min_dur</dt>
<dd>minimum duration (ms) expected for saccades. This helps to avoid identification of very short saccades occurring at the boundary of velocity threshold</dd></dl>

Arguments

Velocity threshold identification of saccades — saccade_VTI

<dl>

<dt>data</dt>
<dd>A dataframe with raw data (time, x, y, trial) for one participant</dd>


<dt>sample_rate</dt>
<dd>sample rate of the eye-tracker. If default of NULL, then it will be computed from the timestamp data and the number of samples</dd>


<dt>threshold</dt>
<dd>velocity threshold (degrees of VA / sec) to be used for identifying saccades</dd>


<dt>min_dur</dt>
<dd>minimum duration (ms) expected for saccades. This helps to avoid identification of very short saccades occurring at the boundary of velocity threshold</dd>

</dl>

saccade_VTI: Velocity threshold identification of saccades

Description

Usage

Value

Arguments

Details

References

Examples