staircase_angular

staircase_angular#

staircase_angular stimulus example

You can find an interactive version of this example here

stimupy.stimuli.waves.staircase_angular(visual_size=None, ppd=None, shape=None, frequency=None, n_segments=None, segment_width=None, period='ignore', rotation=0.0, phase_shift=0, intensity_segments=(0.0, 1.0), target_indices=(), intensity_target=0.5, origin='center', round_phase_width=True)#

Angular staircase, with some segment(s) as target(s)

Parameters:

  • visual_size (Sequence[Number, Number], Number, or None (default)) – visual size [height, width] of image, in degrees

  • ppd (Sequence[Number, Number], Number, or None (default)) – pixels per degree [vertical, horizontal]

  • shape (Sequence[Number, Number], Number, or None (default)) – shape [height, width] of image, in pixels

  • frequency (Number, or None (default)) – spatial frequency of grating, in cycles per image

  • n_segments (int, or None (default)) – number of segments in the grating

  • segment_width (Number, or None (default)) – width of a single segment, in degrees visual angle

  • period ("even", "odd", "either" or "ignore" (default)) – ensure whether the grating has “even” number of phases, “odd” number of phases, either or whether not to round the number of phases (“ignore”)

  • rotation (float, optional) – rotation (in degrees), counterclockwise, by default 0.0 (horizontal)

  • phase_shift (float) – phase shift of grating in degrees

  • intensity_segments (Sequence[float, ...]) – if len(intensity_segments)==2, intensity range of staircase (default 0.0, 1.0); if len(intensity_segments)>2, intensity value for each segment. Can specify as many intensity_segments as n_segments. If fewer intensity_segments are passed than n_segments, cycles through intensities.

  • target_indices (int, or Sequence[int, ...]) – indices segments where targets will be placed

  • intensity_target (float, or Sequence[float, ...], optional) – intensity value for each target, by default 0.5. Can specify as many intensities as number of target_indices; If fewer intensities are passed than target_indices, cycles through intensities

  • origin ("corner", "mean" or "center") – if “corner”: set origin to upper left corner (default) if “mean”: set origin to hypothetical image center if “center”: set origin to real center (closest existing value to mean)

  • round_phase_width (Bool) – if True, round width of segments given resolution

Returns:

dict with the stimulus (key: “img”), mask with integer index for each target (key: “target_mask”), and additional keys containing stimulus parameters

Return type:

dict[str, Any]

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