Specified height of font since some users got an error message on windows machines

signal_detection.py

@@ -90,7 +90,8 @@ def setup(intensity,task):
         win = visual.Window(fullscr=True,
                             units='pix', color=[0.5,0.5,0.5])
         win.setMouseVisible(False)
-    message = visual.TextStim(win, pos=[0,100],text=text)
+    # on some windows machines it seems necessary to specify the height
+    message = visual.TextStim(win, pos=[0,100],text=text,height=16)
     message.draw()
     stim = visual.ImageStim(win, image=stimulus(0),
                             pos=(-15,0), size=(25,25))
@@ -381,5 +382,3 @@ def interactive_sdt():
           lam=widgets.FloatSlider(min=-3, max=7, step=0.1, value=1))
     def update(d_prime, lam):
         plot_sdt(d_prime, lam)
-        
-