本研究有三個子研究，採功能皆析的方法，試圖找出影響智能障礙少年吸吮手指的原因，再進行適當的介入處理。研究一、以類似功能分析(analogue functional analysis)來偵測該學童吸手固著行為是否具有逃避要求、引起他人注意、或是自我感官刺激的功能。研究二、以功能分析操弄四種遮蔽情境，來皆析造成此固著行為的感官功能。研究三、皆別以該學童最喜歡與最不喜歡的偏受物來取代搶著行為的感官後果。研究顯示：感官增強對該學童固著行為具有影響作用，其特定的感官功能可能是觸覺刺邀所造成的。不管使用最喜歡或最不喜歡的偏愛都能有效地替代固著行為，並減少行為。

　　　　　The current study included three experiments that functionally analyzed one student’s stereotyped finger ducking. An analogue functional analysis was used in Experiment 1 to detect the function of the student’s stereotype which might serve to escape from task demands, obtain attention from others, or produce sensory self-stimulation. An analysis of sensory modalities was conducted in Experiment 2 to further analyze the possible sensory consequences causing the student’s stereotype. The most preferred object and the least preferred object were used in Experiment 3 to compete with specific sensory consequences maintaining the student’s finger sucking. Results of the present study demonstrated sensory reinforcement was a determinant of stereotype in this student. The specific function of this student’s stereotype might be maintained by tactile stimulation. Either the most preferred object or the least preferred object many reduce this student’s stereotyped behavior.