stimulus/grating Grating Properties to describe Grating stimuli. Modality The stimulus modality like acoustic, haptic, visual etc. string Type The type of grating used. Commonly either Sinewave or Squarewave gratings are used. string Duration The duration of the stimulus in seconds. floats TemporalOffset The temporal offset (with respect to the begin of the recorded trial) with which this stimulus was presented. floats Contrast The contrast of the grating stimulus. float Intensity The mean intensity of the grating stimulus. float GratingType The type of grating, i.e. 'sinewave' or 'squarewave'. string SpatialWavelength The spatial wavelength of the grating. float SpatialFrequency the spatial frequency of the grating. float SpatialExtent The spatial extend of the presented stimulus (width;height) e.g. (1024;768). 2-tuple Orientation The orientation of the grating in degrees. float DriftingVelocity In case of a constantly drifting grating, the velocity float Position 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. 2-tuple PositionReference top-left , center , bottom-right 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. string Function The function of the described stimulus. E.g. if the white noise constituted the carrier. string OutputChannel 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. string