基于Psychopy实现ssvep闪烁刺激

from psychopy import visual, core
import numpy as np

win = visual.Window(size=(1280, 130), pos=(0, 543), color=(0, 0, 0))
pic_path = 'somepic.JPG'
timer = core.Clock()
timer.reset()
block = visual.ImageStim(win, pos=(-0.82, 0), size=(0.3, 1.8))
block.image = pic_path

frq = 1
now_time = 0
block.autoDraw = True
while now_time<10 :
    now_time = timer.getTime()
    # block.opacity = abs(np.sin(2 * np.pi * now_time* frq/2))
    block.opacity = np.sin(2 * np.pi * now_time * frq)
    # opacity 的值 为0~1 大于1取1，小于0取0
    # block.contrast = np.sin(2 * np.pi * now_time * frq)
    # block.draw()
    win.flip()
win.close()

此处使用了两种思路，一种是通过改变刺激的不透明度opacity，来实现“闪烁”的效果，另一种是使用改变对比度contrast，来实现闪烁的效果。

• 若使用psychopy直接画出色块，可用：

block1 = visual.Rect(win, pos=(-0.82, 0), size=(0.3, 1.8), fillColor='white')