Functional neuroimaging and patient studies demonstrated significant involvement of ventral area V4α, located in the anterior ventral pathway, in color vision. A low number of case studies reported lesions in close vicinity to this region leading to symptoms of hemiachromatopsia indicating hemifield-specific processing of color information. With the present study, we present the first group study investigating hemiachromatopsia after injury to anterior ventral brain areas. In lateral stimulus presentations with several color perception tasks, we observed symptoms of hemiachromatopsia, which were specific to patients with unilateral lesions to the ventral pathway. Particularly, we identified unilateral lesions to area V4α as an important contribution to color perception deficits under demanding viewing conditions. Our results suggest that color information processed along the anterior ventral path is hemifield-specific and that selective deficits in color perception cannot be fully compensated by the intact contralesional visual stream.

功能神经影像学和患者研究表明，位于前腹侧通路的腹侧区域 V4α 显着参与色觉。少数案例研究报告了该区域附近的病变导致半色盲症状，表明颜色信息的半场特定处理。在本研究中，我们提出了第一组研究前腹侧脑区损伤后的半色盲症。在具有几种颜色感知任务的横向刺激演示中，我们观察到半色盲的症状，这是特定于腹侧通路单侧病变的患者。特别是，我们将 V4α 区的单侧病变确定为在苛刻的观看条件下对色觉缺陷的重要贡献。