過去的研究大多認為聲韻覺識和視覺處理是影響閱讀障礙的關鍵因素。然而，語音和視覺空間處理在閱讀障礙兒童大腦側化中的表現，以及其側化表現是否受功能擁擠（functional crowding）影響等議題仍未被充分探討。本研究透過檢測18名閱讀障礙的學齡兒童和20名年齡匹配的一般發展兒童（共38 名）在語音和視覺空間處理過程中的大腦側化表現去進一步探討功能性擁擠假說（Functional Crowding Hypothesis）。我們以韻律決策（Rhyme Decision; RD）和地標決策（Landmark Decision; LD）兩個功能性經顱多普勒（fTCD）任務來分別評估受試者的語音及視覺處理側化表現。結果表明，在 RD 任務中，兩組受試者都顯示為左側化，但兩組均無顯著差異。而在 LD 任務中，一般發展組表現為右側化，而閱讀障礙組則表現為左側化，且無顯著的組間差異。此外，我們發現，功能擁擠對一般發展兒童及閱讀障礙兒童有著不同的影響。我們認為在語音和視覺空間處理方面缺乏功能特化的閱讀障礎兒童在語音技能發展方面可能會面臨更多的挑戰。

Previous research has highlighted the importance of phonological awareness and visual processing in understanding dyslexia. However, the role of cerebral lateralization in phonological and visuospatial processing, especially in the context of functional crowding, remains understudied. This study investigated the Functional Crowding Hypothesis by examining the cerebral lateralization of phonological and visuospatial processing in 38 participants, including 18 school-age children with dyslexia and 20 age-matched typically developing children. The participants underwent Rhyme Decision (RD) and Landmark Decision (LD) tasks using functional transcranial Doppler (fTCD) to assess lateralization. Results indicate left lateralization in both groups during the RD task, with no significant differences. Notably, the TD group shows right lateralization, while the DD group exhibits left lateralization during the LD task, with no significant group differences. Furthermore, our findings suggest that the influence of the functional crowding condition may not be uniformly applicable across typically developing individuals and those with dyslexia. We provide support for the Functional Crowding Hypothesis, suggesting that children with dyslexia who lack functional specialization in phonological and visuospatial processing may face increased challenges in the development of phonological skills.

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