Stimulus

Available stimulus

• Full-field grating
• Patch grating
• Flashing spot
• Natural scenes and movies

pylgn.stimulus.create_flashing_spot(contrast=1, patch_diameter=array(1.) * deg, delay=array(0.) * ms, duration=array(0.) * ms)

Create flashing spot

Parameters:

• contrast (float) – Contrast value
• patch_diameter (float/quantity scalar) – Patch size
• delay (float/quantity scalar) – onset time
• duration (float/quantity scalar) – duration of flashing spot

Returns:

out – Evaluate function

Return type:

callable

pylgn.stimulus.create_flashing_spot_ft(contrast=1, patch_diameter=array(1.) * deg, delay=array(0.) * ms, duration=array(0.) * ms)

Create Fourier transformed flashing spot

Parameters:

• contrast (float) – Contrast value
• patch_diameter (float/quantity scalar) – Patch size
• delay (float/quantity scalar) – onset time
• duration (float/quantity scalar) – duration of flashing spot

Returns:

out – Evaluate function

Return type:

callable

pylgn.stimulus.create_fullfield_grating(angular_freq=array(0.) * Hz, wavenumber=array(0.) * 1/deg, orient=array(0.) * deg, contrast=1)

Create full-field grating

Parameters:

• angular_freq (float) – Angular frequency (positive number)
• wavenumber (float/quantity scalar) – Wavenumber (positive number)
• orient (float/quantity scalar) – Orientation
• contrast (float) – Contrast value

Returns:

out – Evaluate function

Return type:

callable

Notes

Both angular_freq and wavenumber are positive numbers. Use orientation to specify desired direction.

pylgn.stimulus.create_fullfield_grating_ft(angular_freq=array(0.) * Hz, wavenumber=array(0.) * 1/deg, orient=array(0.) * deg, contrast=1)

Create Fourier transformed full-field grating

Parameters:

• angular_freq (float) – Angular frequency (positive number)
• wavenumber (float/quantity scalar) – Wavenumber (positive number)
• orient (float/quantity scalar) – Orientation
• contrast (float) – Contrast value

Returns:

out – Evaluate function

Return type:

callable

Notes

Both angular_freq and wavenumber are positive numbers. Use orientation to specify desired direction. The combination of angular_freq, wavenumber, and orient should give w, kx, and ky that exist in function arguments in evaluate function.

pylgn.stimulus.create_natural_image(filenames, delay=array(0.) * ms, duration=array(0.) * ms)

Creates natural image stimulus

Parameters:

• filenames (list/string) – path to image(s)
• delay (quantity scalar) – Onset time
• duration (quantity scalar)

Returns:

out – Evaluate function

Return type:

callable

pylgn.stimulus.create_natural_movie(filename)

Creates natural movie stimulus

Parameters:filename (string) – path to gif Returns:out – Evaluate function Return type:callable

pylgn.stimulus.create_patch_grating(angular_freq=array(0.) * Hz, wavenumber=array(0.) * 1/deg, orient=array(0.) * deg, contrast=1, patch_diameter=array(1.) * deg)

Create patch grating

Parameters:

• angular_freq (float) – Angular frequency (positive number)
• wavenumber (float/quantity scalar) – Wavenumber (positive number)
• orient (float/quantity scalar) – Orientation
• contrast (float) – Contrast value
• patch_diameter (float/quantity scalar) – Patch size

Returns:

out – Evaluate function

Return type:

callable

Notes

Both angular_freq and wavenumber are positive numbers. Use orientation to specify desired direction.

pylgn.stimulus.create_patch_grating_ft(angular_freq=array(0.) * Hz, wavenumber=array(0.) * 1/deg, orient=array(0.) * deg, contrast=1, patch_diameter=array(1.) * deg)

Create Fourier transformed patch grating

Parameters:

• angular_freq (float) – Angular frequency (positive number)
• wavenumber (float/quantity scalar) – Wavenumber (positive number)
• orient (float/quantity scalar) – Orientation
• contrast (float) – Contrast value
• patch_diameter (float/quantity scalar) – Patch size

Returns:

out – Evaluate function

Return type:

callable

Notes

Both angular_freq and wavenumber are positive numbers. Use orientation to specify desired direction. The combination of angular_freq, wavenumber, and orient should give w, kx, and ky that exist in function arguments in evaluate function.