![]() These results contradict the assertion that the latter outcome occurs because red houselight is a stronger appetitive excitor than tone at the start of the experiment (the “head start” hypothesis). ![]() These results indicate that red houselight becomes a conditioned inhibitor more quickly than tone in appetitive situations, just as red houselight becomes a conditioned excitor more quickly in those situations. Moreover, in a transfer test, red houselight inhibited responding to the other keylight, B, but tone did not. When X was a tone, discrimination between A and AX was much poorer. ![]() When X was red houselight, the birds pecked A at a much lower rate in the presence of X. The birds pecked the A and B stimuli at a high rate. For some groups, the putative inhibitor was a tone, whereas for others it was illumination of a red houselight. Once in after taking the video clip into after effects, load the clip onto the composition or the timeline and under the effects tab you look for keying and then Keylight 2.0 and the Keylight box will show in the top left-hand corner then click on the eyedrop tool and select the green screen and that would take out whatever that is green. ![]() However, when one of these keylights was accompanied by another stimulus, food did not follow (AX−). In a conditioned inhibition paradigm (A+, B+, AX−_, pigeons received either of two keylight stimuli reliably followed by food (A+, B+).
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