Which schedule of reinforcement presents the reinforcer at the end of a predetermined interval, contingent on the number of responses emitted during the interval being greater than a gradually increasing criterion based on the individual's performance in previous intervals?

Differential Reinforcement Ratio of High Rates

Explanation:

Differential Reinforcement Ratio of High Rates is a schedule of reinforcement when reinforcement is provided at the end of a predetermined interval, contingent on the number of responses emitted during the interval being greater than a gradually increasing criterion based on the individual's performance in previous intervals, it is contingent upon emitting at least a certain number of responses in a certain period of time. When reinforcement is higher than a predetermined criterion, it produces a higher rate of return.

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.