An indiscriminable contingency is a contingency in which the learner can discriminate whether the next response will produce reinforcement. true false

Explanation:

i think its toxic gasses but i could be wrong

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.