Computation of relative numerosity of circular dot textures.
Computation of relative numerosity of circular dot textures.
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DOI：
10.1167/13.2.17
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发表时间：
2013-02-12
影响因子：
1.8
通讯作者：
Morgan M
中科院分区：
文献类型：
--
作者：
Raphael S;Dillenburger B;Morgan M
为了找出是否有单独的视觉机制的大小，密度和数量计算的纹理，我们调查了人类观察者的能力，以区分近似圆形纹理之间的数量差异，并决定是否差异是由于圆的大小或点密度的变化。标准纹理总是包含64个随机对比极性的不规则间隔的模糊点。通过在图案尺寸不变的情况下改变点密度或在密度不变的情况下改变图案尺寸，从测试图案中添加或减去点。观察者必须决定大小或密度是否发生了变化，以及变化是增加还是减少（混合任务条件）。在一个单独的条件下，他们报告了数量的差异（数量条件）。当数量的变化与大小的变化相关联时，比与密度的变化相关联时，数量的变化被更准确地报道，反对数量的单一机制。观察者倾向于报告更大的模式更密集，反之亦然。这些数据与观察者从尺寸和密度信号计算数值的机制一致，并在将信号转换为z值后通过信号检测理论MAX规则决定尺寸或密度是否发生变化。由于阈值并没有显着低于在混合任务条件下的数量条件，我们得出结论，直接数量机制，如果它存在，必须比响应的大小和密度的变化的机制更嘈杂。
To find out whether there are separate visual mechanisms for size, density, and numerosity computation in textures, we investigated the ability of human observers both to discriminate differences in numerosity between approximately circular textures and to decide whether the differences were due to a change in circle size or dot density. The standard texture always contained 64 irregularly spaced fuzzy dots of random contrast polarity. Dots were added or subtracted from the test pattern either by changing the dot density with the pattern size constant or the pattern size with density constant. Observers had to decide whether size or density had changed and whether the change was an increase or a decrease (mixed task condition). In a separate condition, they reported differences in numerosity (numerosity condition). Numerosity changes were more accurately reported when they were correlated with changes in size than with changes in density, arguing against a single mechanism for numerosity. Observers showed a bias toward reporting larger patterns as denser and vice versa. The data were consistent with a mechanism in which observers compute numerosity from size and density signals and decide whether size or density had changed by the signal detection theory MAX rule after transforming signals into z-values. Because thresholds were not significantly lower in the numerosity condition than in the mixed task condition, we conclude that the direct numerosity mechanism, if it exists, must be noisier than the mechanisms that respond to changes in size and density.
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影响因子：
1.8
作者：
Ross, John;Burr, David C.
通讯作者：
Burr, David C.
影响因子：
1.8
作者：
Morgan, MJ;Watamaniuk, SNJ;McKee, SP
通讯作者：
McKee, SP
DOI：
10.1073/pnas.1113195108
发表时间：
2011-12-06
影响因子：
11.1
作者：
Dakin, Steven C.;Tibber, Marc S.;Morgan, Michael J.
通讯作者：
Morgan, Michael J.
影响因子：
1.8
作者：
Morgan, Michael J.
通讯作者：
Morgan, Michael J.
DOI：
10.1037/0096-1523.21.1.149
发表时间：
1995-02-01
影响因子：
2.1
作者：
DURGIN, FH
通讯作者：
DURGIN, FH