gabor
element objects
A sinusoidal grating with a Gaussian envelope in a rectangular display area. Default is a grayscale grating that oscillates between pure black and white in a square area. Uses standard formulas for grating and envelope—see gabor_open.m if you want to check them.
▸ Object ends on its own?
"Ends on its own" means ends automatically at that point. If an element can end on its own, you don't need to set end conditions for it in property end (unless you want it to maybe end earlier).
No—runs until any condition you set in property end.
size
frequency
orientation
phase
meanIntensity
amplitude
contrast
sigma
color
All visual elements
position
depth
nn_eyes
rotation
flipHorz
flipVert
colorMask
alpha
intensity
contrastMult
convolution
shader
filterOrder
filterGrayscale
filterResolutionMult
filterGamma
channelResolution
backColor
addDisplay
All visual elements
position
All adjuster elements have
adjust
All response handler elements
translateResponse
scoreResponse
correctResponse
scoreResponseForStaircase
maxNumResponses
recordDefaultResponse
registerTrigger
autoResponse
autoResponseLatency
All elements
start
end
startBuffer
endBuffer
vary
staircase
All objects
report
info
size
Default: square with sides 5 deg
Sets display area for the Gabor. A number that is side length for a square, or a vector [width height] for a rectangle (deg).
frequency
Default: 2 cycles/deg
Spatial frequency (cycles/deg).
orientation
Default: vertical
Orientation angle of the grating, + = clockwise (deg). 0 = vertical bars. This sets rotation of the grating within its rectangular display area. For rotation of the whole display use property rotation.
phase
Default: 0
Phase of grating (cycles). 0 = sine grating left → right centered in its display area, 0.5 = negative sine grating, 0.25 = cosine grating, etc.
meanIntensity
amplitude
contrast
Defaults: meanIntensity = 0.5, amplitude = 0.5
meanIntensity is a number between 0–1 (black–maximum) setting the pixel intensity the grating oscillates about, also the intensity it decays toward at its edges due to the Gaussian envelope.
Also set one of:
amplitude is max intensity − mean intensity.
OR
contrast is Michelson contrast, amplitude / mean intensity. If you set contrast, mean intensity must be > 0.
It's possible to set a combination of these properties that causes the grating to clip at intensity 0 or 1. See record properties maxAmplitude and maxContrast below.
sigma
Default: 0.75 deg
Standard deviation for a symmetric Gaussian envelope (deg). <cd>inf<cd> = no envelope.
You can also use a vector <cd>[s_x s_y]<cd> for an asymmetric envelope. Here x is perpendicular to grating bars and y is parallel to them. Grating orientation can be set using orientation above.
color
Default: white
A 1×3 RGB vector with numbers between 0–1. This defines the color at pixel intensity = 1. Color at intensity = 0 is <cd>[0 0 0]<cd>. Color at all other intensities is linearly interpolated between the two.
Adjustable properties
You can vary or allow the subject to adjust the following properties of an object of this type when it's running. If you need to make other properties adjustable, you can edit the element type code—see Element Type Programming Manual.
Adjustable properties
Adjustable properties
position
nn_eyes
rotation
colorMask
alpha
intensity
contrastMult
drawCodeVars
(None)
(None)
PsychBench uses record properties to record information during experiments. You can't set record properties but you can see them in experiment results using input property report.
maxAmplitude
maxContrast
All response handler elements
response
responseScore
responseTime
responseLatency
d_responseTime
numResponses
All elements
startTime
endTime
duration
n_startFrame
n_endFrame
startLatencyBufferable
endLatencyBufferable
All elements
startTime
endTime
duration
n_startFrame
n_endFrame
startLatencyBufferable
endLatencyBufferable
trigger
triggerTime
d_triggerTime
numTriggers
syncTime
maxAmplitude
maxContrast
Values for input properties amplitude and contrast that would cause intensity to clip at 0 or 1 given the current value of meanIntensity.