A study on unified organization of visual features in object recognition and spatial vision

本研究的重点是视觉感知时空特征与物体识别和空间视觉的结合问题。采用心理物理实验和脑成像方法，研究了以下问题。1)轮廓感知生成中的时间整合利用两对去除扇区的磁盘的顺序呈现，研究了主观轮廓感知的时间整合特性。主观轮廓的时间积分时间比真实轮廓（边缘或直线轮廓）的时间积分时间长，表明局部信息的保留在主观轮廓的生成中起着重要作用。2)双目整合：我们提出了一种新的运动透明错觉，这种错觉是由反相位闪烁刺激的双眼呈现引起的。提出了视觉系统将运动图像分解为傅里叶分量，并提出了一阶运动系统（如方向敏感和差分敏感的运动能量检测系统）可以作为分解的中介。3)移动边缘与固定染色质边缘的相互作用我们提出了一种新的现象，即一个静止的彩色图案和一个移动的黑色轮廓或点图案在感知上统一组织。提出了视觉系统有效地利用运动特征的信息来定义重叠的彩色图像区域的形状。4)其他研究分别为“二维运动同化”、“近距离运动信号的求和与远距离运动信号的促进/抑制相互作用”、“霓虹灯颜色扩散产生中亮度与颜色线索的相互作用”、“脑磁图新方法”和“人脑皮层V1区对正弦光栅刺激的磁响应”。

The present study focused the binding problems of visual perceptual spatio-temporal features into object recognition and spatial vision. Using psychophysical experiments and brain imaging method, we investigated the following.1) Temporal integration in generation of contour perceptionUsing the sequential presentation of two pairs of disks with a sector removed, we investigated the temporal integration properties of subjective contour perception. It was found that the temporal integration time for subjective contour was longer than that for real contour (edge or line contour), suggesting that the retention of local information takes an important role in generation of subjective contour.2) Binocular integrationWe presented a new illusory perception of motion tranceparency caused by the binocular presentation of counter-phase flickering stimuli. It was suggested that the visual system decomposes the moving images into Fourier components, and that the decomposition may be mediated by the first order motion system such as the direction- and disparity-sensitive motion energy detection system.3) Interaction between moving edge and statinary chromatin edgeWe presented a new phenomina involed perceptually unified organization of a atationary chromatic pattern and a moving black outline or dot pattern. It was suggested that the visual system effectively uses information from moving features to define the shape of overlapping chromatic image regions.4) The others concearned 'The 2-D motion assimilation', 'Summation between nearby motion signals and facilitatory/inhibitory interaction between distant motion signals', 'Interaction between luminance and color cues in generation of neon color spreading', 'A new method for magnetoencephalography', and 'Magnetic responses of human cortical area V1 to sinusoidal grating stimuli.