Spatial phase dependence and the role of motion detection in monocular and dichoptic forward masking
Spatial phase dependence and the role of motion detection in monocular and dichoptic forward masking
复制标题
空间相位依赖性以及运动检测在单目和双目前向掩蔽中的作用
DOI：
10.1016/0042-6989(88)90036-3
复制
发表时间：
1988
期刊：
影响因子：
1.8
通讯作者：
M. Georgeson
中科院分区：
文献类型：
--
作者：
M. Georgeson
在相同空间频率(通常为1c/deg)的前向掩蔽条件下，用QUEST程序测量了短暂闪光光栅的对比度阈值。低对比度遮罩在短起始时间(0到50毫秒)时降低阈值，而高对比度遮罩在更宽的时间范围内(0到100-140毫秒)提高阈值。这两种效应都依赖于空间位相关系，但方式不同。在0-±90°相位的阈值降低可能是由方向选择机制的时空滤波引起的。这一结论得到了运动检测器模型的计算机模拟的支持。运动分析的方向选择阶段可能完全是单眼的，因为90度时的易化被分视呈现所取消。阈值升高在短时间(20-50毫秒)时与相位有关，在±90度时最小，但在较长时间(70-140毫秒)时不随时间变化。同相掩蔽(0度)在单眼和双眼情况下表现出大致相同的强度，但双眼阈值的升高在任何SOA中都不显示出阶段依赖性。阈值升高在较长的SOA值和分视呈现时，可能反映了一种纯抑制的双眼掩蔽效应，对空间相位没有选择性，其基础可能与对比度适应相同。简而言之，单目和双目掩蔽数据显然反映了这种相独立抑制和相选择性促进的混合。
Contrast thresholds for briefly flashed gratings were measured by the QUEST procedure, under conditions of forward masking by gratings of the same spatial frequency (usually 1 c/deg). Low-contrast masks reduced threshold at short onset asynchronies (0 to 50 msec), while higher contrasts raised threshold over a broader temporal range (0 to 100–140 msec). Both effects depended on the spatial phase relation, but in different ways. Threshold reduction at0–±90degphases probably arises from spatio-temporal filtering by direction-selective mechanisms. This conclusion was supported by computer simulation of a motion detector model. The direction-selective stage of motion analysis may be entirely monocular, since facilitation at 90 deg was abolished by dichoptic presentation. Threshold elevation was phase-dependent at short SOA's (20–50 msec), with a minimum at±90 deg, but was not phase-dependent at longer SOA's (70–140 msec). In-phase masking (0 deg) was about equally strong monocularly and dichoptically, but dichoptic threshold elevation showed no phase-dependence at any SOA. Threshold elevation at longer SOA's, and with dichoptic presentation, may reflect a purely suppressive binocular masking effect, unselective for spatial phase, and its basis may be the same as contrast adaptation. At short SOA's, monocular and binocular masking data apparently reflect a mixture of this phase-independent suppression and phase-selective facilitation.
DOI：
10.1364/josaa.2.001508
发表时间：
1985-01-01
影响因子：
1.9
作者：
PELLI, DG
通讯作者：
PELLI, DG
影响因子：
--
作者：
LEGGE, GE;FOLEY, JM
通讯作者：
FOLEY, JM