Effects Of Different Learning Task And Variation Of Membership Gradient On Classification Results

In category using process after category learning process, there are certain criteria to determine the category of new stimulus. The purpose of this research is to find out the change of the criterion and its influential factors.Experiment method was used in this research, and there were227undergraduates and postgraduate students participated in the experiment program. E-prime software was used to take on the stimulus and record response data. Two experiments were conducted in present study. There were two kinds of prototype distortion tasks in experiment1,(A, B) and (A, not A) were contracted with each other. Experiment2was a2(learning task:(A, B) and (A, not A))×3(variational degrees of membership gradient:2,3and4)×2(changing direction of membership gradient:positive and negative) design. We examined the influence of these three factors on category judgment of new stimulus.From the results and the analysis, we concluded that:(1) In two kinds of prototype distortion tasks, there was priming effect if the judgment task was consistent with learning task;and the learning task inhibited judgment if they were different.(2) Participants did better in (A, not A) judgment task after (A, not A) learning than (A, B) judgment task after (A, B) learning.(3) Variational degrees of membership gradient had effects on the classification results, with the degree becoming larger, the deviation of participant growing.(4) The changing direction of membership gradient under different kind of learning task had different effects on participants’performance:in (A, B) task, the deviation of participant was larger in positive direction while it is lager in negative direction under (A, not A) task.