Sessions 57 60 comprised only test trials; thus there were six reinforced presentations of w, six of z, and 15 nonreinforced presentations of each transfer CS signalled by each occasion setter (15 A… w−, 15 A… z−, 15 B… w−, 15 B… z−, 6 w+−, 6 z+).
The reinforced presentations of w and z were included to ensure the animals did not stop responding altogether on the test trials; as the critical comparison was between responding on same and different trials, rather than with responding to the target alone, this difference in reinforcement experience did not affect interpretation of the results.
Signs often ask challenging questions, reinforcing presentations made in the Zoo's Discovery Center, or alert viewers to look for signs of animal habitation.
The light stayed lit for as long as the lever was associated with reinforcement, but was turned off during reinforcer presentation.
The rate of reinforcer presentation is also of importance and reminds one of the theoretical positions of the State Regulation hypothesis.
If the flap was not opened within 5 s after a reinforcer presentation, the water dipper was lowered and the cubicle light was turned off.
A constant-probability VI 75-s schedule based on the sequence of intervals described by Catania and Reynolds [21] was operative throughout all the trials, pausing only during reinforcer presentation (5 s) and the inter-trial intervals (10 s).
In the PREE, the loss of responding that occurs in extinction is slower when the conditioned stimulus (CS) has been paired with a reinforcer on some of its presentations (partially reinforced) instead of every presentation (continuously reinforced).
Following reinforcer presentations, the two squares switched sides at random, but were never displayed on the same side more than twice in a row.
Control of television presentation reinforced a meek challenge.
Other public health experts said that Dr. Levin's presentation reinforced their assessment that the long-term health consequences of the attacks were not likely to be severe for the general population.
