According to carl rogers is an attitude of provisional acceptance toward another person. this attitude nurtures growth in others.

This is what is called the conditional positive regard. It is the opposite of the unconditional positive regard and it means acknowledgment under certain condition. It can be both positive and negative. Positive when nurtures growth and negative when for example child comes out as homosexual and his parents start encouraging him to seek medical help unless the their child wants them to stop providing positive regard.

what is the other part to the question

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.