All lights were extinguished.
Also, through choice of appropriate monomers, the dark polymerization studies were performed such that the polymerization rate was approximately the same at the point the light was extinguished for all these monomers.
Sweden had been "a light in the darkness this autumn", said the Left party leader, Jonas Sjöstedt, "but today the light was extinguished".
It's true the light was extinguished for generations in Spain.
If the animal did not respond correctly (e.g., nose-poking into a non-illuminated hole), or failed to nose-poke within the allowed time (omission error), or responded prematurely (i.e., nose-poke into the holes during the ITI: i.e., before the onset of the stimulus), the house light was extinguished for 5 s ('Time Out', TO).
During that 20 sec, the cue-light (conditioned stimulus [CS]) above the active lever was illuminated, the house light was extinguished, and both levers were retracted.
When a lever-press occurred, the lever(s) were withdrawn, the central light was extinguished, and the light located above the lever that had been depressed was illuminated.
After responding once to the illuminated TI key, the key light was extinguished and the first key position of the three-term sequential response was turned on.
Incorrect, omitted and premature responses were punished with a 5 s time out, during which the house light was extinguished and no new trials could be initiated.
A response prior to stimulus onset (premature) or failure to respond in a limited hold period after stimuli presentation (omission) were punished by a 5-s timeout period during which the house light was extinguished and no reward was delivered.
After a response to the incorrect stimulus, both stimuli disappeared from the screen, the house light was extinguished for a 5-s timeout period and a mildly aversive, loud noise (108 dB) was presented for 0.3 s.
