Drifting Grating Stimulus¶

Description¶

A drifting grating stimulus

Signature¶

stimulus/drifting_grating

Required Parameters¶

spatial_frequency¶

Example:	`0`

Spatial frequency (cycles per degree)

speed¶

Example:	`1`

Drift speed (degrees per second)

grating_type¶

Options:	`sinusoid`, `square`, `triangle`, `sawtooth`

Grating type

mask¶

Options:	`rectangle`, `ellipse`, `gaussian`

Mask type

x_size¶

Example:	`5.0`

Horizontal size (degrees)

y_size¶

Example:	`5.0`

Vertical size (degrees)

Optional Parameters¶

direction¶

Default:	`0.0`

Direction of drift (degrees)

starting_phase¶

Default:	`0.0`

Starting phase (degrees)

grating_sample_rate¶

Default:	`32`

Number of samples to generate when computing grating values

inverted¶

Default:	`NO`

If YES, sawtooth gratings will start high instead of low

std_dev¶

Default:	`1.0`

Standard deviation of Gaussian mask

mean¶

Default:	`0.0`

Mean of Gaussian mask

x_position¶

Default:	`0.0`

Horizontal center position (degrees)

y_position¶

Default:	`0.0`

Vertical center position (degrees)

rotation¶

Default:	`0.0`

Rotation (degrees)

alpha_multiplier¶

Default:	`1.0`

Controls the transparency of the stimulus. 1.0 is fully opaque, while 0.0 is fully tranparent.

deferred¶

Options:	`no`, `yes`, `explicit`
Default:	`no`

Controls when the stimulus is loaded. If no, the stimulus is loaded at experiment load time. If yes, the stimulus is loaded the first time it is queued. If explicit, the stimulus must be loaded explictly with Load Stimulus.

autoplay¶

Default:	`NO`

If YES, the stimulus will start playing automatically (as if by an implicit Play Dynamic Stimulus action) after it has been queued and Update Stimulus Display has been invoked. It will also stop playing automatically (as if by an implicit Stop Dynamic Stimulus action) after it has been dequeued and Update Stimulus Display is invoked.