Facilitation and masking of briefly presented gratings: Time-course and contrast dependence
Facilitation and masking of briefly presented gratings: Time-course and contrast dependence
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简单呈现的光栅的促进和掩蔽：时间过程和对比度依赖性
DOI：
10.1016/0042-6989(87)90086-1
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发表时间：
1987
期刊：
影响因子：
1.8
通讯作者：
J. Georgeson
中科院分区：
文献类型：
--
作者：
M. Georgeson;J. Georgeson
我们测量了在不同对比度的叠加掩蔽光栅存在的情况下，以及在一定的起始不同步范围内，短暂呈现的正弦光栅的两个可选的强迫选择对比度阈值。当掩模同时、同相和接近阈值时，发生促进(较低阈值)，但在50毫秒或更长的异步处，通过将测试光栅呈现为短暂的对比度反转而不是脉冲来取消。我们认为，易化需要相同神经通道内反应的时间总和，但我们的结果并不区分传感器模型和不确定性模型。掩蔽(阈值升高)发生在更广泛的异步范围内，并且不会因测试对比度反转而取消。掩蔽和促进可能取决于不同的过程和不同的时间进程。在时间总和范围之外的异步处出现掩蔽表明，静态、压缩换能器通常不考虑掩蔽。短暂掩蔽和长时间对比度适应在大小上非常相似，并且是对比度和相对空间频率的函数。掩蔽和适应可能有共同的起源，但恢复的速度不同。
We measured two-alternative forced-choice contrast thresholds for briefly presented sinusoidal gratings in the presence of superimposed masking gratings of various contrasts, and at a range of onset asynchronies. Facilitation (lower thresholds) occurred when the mask was simultaneous, in-phase, and near-threshold, but was abolished at asynchronies of 50 msec or more and by presenting the test grating as a brief contrast reversal instead of a pulse. We argue that facilitation requires temporal summation of responses within the same neural channels, but our results do not distinguish between transducer and uncertainty models. Masking (threshold elevation) occurred over a broader range of asynchronies, and was not abolished by test contrast reversal. Masking and facilitation probably depend on different processes with different time-courses. The occurrence of masking at asynchronies outside the range of temporal summation suggests that a static, compressive transducer does not, in general, account for masking. Brief masking and prolonged contrast adaptation are very similar in magnitude, and as a function of contrast and relative spatial frequency. Masking and adaptation may have a common origin, but differ in speed of recovery.
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
通过掩蔽测量视觉通道的时间特性。
DOI：
10.1364/josaa.2.001260
发表时间：
1985
期刊：
Journal of the Optical Society of America. A, Optics and image science
影响因子：
--
作者：
Lehky,SR
通讯作者：
Lehky,SR
影响因子：
--
作者：
LEGGE, GE;FOLEY, JM
通讯作者：
FOLEY, JM