stimulus/grating Grating Properties to describe Grating stimuli. Modality string The stimulus modality like acoustic, haptic, visual etc. Type string The type of grating used. Commonly either Sinewave or Squarewave gratings are used. Duration float s The duration of the stimulus in seconds. TemporalOffset float s The temporal offset (with respect to the begin of the recorded trial) with which this stimulus was presented. Contrast float The contrast of the grating stimulus. Intensity float The mean intensity of the grating stimulus. GratingType string The type of grating, i.e. 'sinewave' or 'squarewave'. SpatialWavelength float The spatial wavelength of the grating. SpatialFrequency float the spatial frequency of the grating. SpatialExtent 2-tuple The spatial extend of the presented stimulus (width;height) e.g. (1024;768). Orientation float The orientation of the grating in degrees. DriftingVelocity float In case of a constantly drifting grating, the velocity Position 2-tuple The position of the stimulus on e.g the screen. Specified as a 2-tuple (x;y). By default this position refers to the top-left corner of the object or its bounding box. PositionReference top-left string center string bottom-right string By default stimulus positions are specified by the coordinates of the top-left corner (or of the bounding box). Use this property for other definitions. Function string The function of the described stimulus. E.g. if the white noise constituted the carrier. OutputChannel string The physical output device (e.g. an analog output channel, a monitor screen, the same loudspeaker, etc.). This information can be used to explicitly express that several stimuli (that share the same OutputChannel) are jointly presented.