本研究的目的以雙重任務實驗設計，並在Hick定律的概念下以增加刺激源的反應選擇量，操弄0-bit與1-bit訊息處理量對反應時間或平衡表現之影響。實驗參與者為18名兒童（9.38 ± 0.27歲），實驗參與者隨機進行簡單反應時間（0-bit訊息處理量）、選擇反應時間（1-bit訊息處理量）、單純站立平衡、站立平衡下的簡單反應時間、站立平衡下的選擇反應時間等總計五項任務之測試。Biodex950-300平衡測量儀、友聲電子聲光反應器則分別用來來記錄平衡表現與反應時間。平衡表現與反應時間測量參數以重複量數單因子變異數分析、2（平衡）× 2（訊息處理量）重複量數二因子變異數分析和HSD法事後比較進行統計考驗（α = .05）。結果發現平衡表現在1-bit訊息處理量總穩定指數低於0-bit訊息處理量，而1-bit訊息處理量總搖晃指數低於單純平衡表現；不論是單一任務情境或是雙重任務情境，簡單反應時間皆快於選擇反應時間。研究顯示可使用反應時間探查技術來推測次要任務所需的注意，但未發現增加訊息處理量會影響兒童平衡表現。

　　The purpose of this study was to investigate the effect of reaction time (RT) or balance performance as the number of stimulus response choices increases, the amount of information processing of 0-bit and 1-bit conditions based on Hick’s law, using the dual-task design. Eighteen children (age: 9.38 ± 0.27 years old) were recruited as the participants for this study, and asked to assess RT and balance performance separately and simultaneously as following five conditions: simple RT (0-bit decision), choice RT (1-bit decision), single balance control, balance control with simple RT, and balance control with choice RT. Biodex 950-300 balance system and You-Shang response timer were used to record and analyze the postural stability and information processing speed (RT) respectively for the participants. Repeated measures one-way ANOVA with HSD post-hoc test and 2 (balance) × 2 (amount of information processing) repeated measures two-way ANOVA were used to test the parameters of balance performance and RT (α = .05). The results showed the overall stability index in 1-bit decision was lower than in 0-bit decision, and the mean deflection in 1-bit decision was lower than in single balance performance. Simple RTs were faster than choice RTs both in single task condition and dual task condition. It indicated that the chronometric approach of RT could use to infer the attention requirement of the secondary task. However, this study did not find that the balance performance be interfered for children by the increasing of the amount of information processing.