The Application of the Constant Method in Determining Critical Flicker Frequency (CFF)
The Application of the Constant Method in Determining Critical Flicker Frequency (CFF)
复制标题
常数法在确定临界闪烁频率(CFF)中的应用
DOI：
10.1080/00221309.1954.9920221
复制
发表时间：
1954
影响因子：
2.5
通讯作者：
H. Misiak
中科院分区：
文献类型：
--
作者：
H. Ricciuti;H. Misiak
在几乎所有关于临界闪烁频率（CFF）的研究中，均使用显着差异法或极限法来获得单独的 CFF 测量值。利用该方法，受试者报告频率逐渐增加的闪烁光何时刚刚显得稳定，和/或频率逐渐降低的稳定光何时首先开始闪烁。做出许多这样的判断，将这些过渡频率或“临界”频率的平均值作为个人的 CFF。这种方法的广泛使用很大程度上取决于这样一个事实：直到最近，旋转盘几乎专门用于视觉闪烁融合的研究。这种类型的设备不容易允许快速、准确地改变频率，因此使用需要呈现各种恒定频率的离散刺激的方法变得极其困难。随着最近电子设备的发展允许快速、准确地改变光刺激的频率，探索使用其他方法来确定 CFF 成为可能。作者在进行 CFF 测定时遇到了“公正显着差异”(jnd) 方法的几个固有缺点：(a) jnd 方法通常要求受试者在相对较长的曝光时间（大约 8-15 秒）内观察变化的光刺激，因此会出现一些问题。准确地报告“闪烁”的现象体验转变为“无闪烁”或“稳定光”的过渡点，反之亦然，是一项困难且关键的感知判断，需要高度持续和充分调动的注意力。在长时间的光照下，主体很难保持如此高水平、持续的注意力。在确定受试者的 CFF 时，这一困难尤其严重，其能力* 编辑部于 1952 年 8 月 18 日收到。 1“临界闪烁频率”、“闪烁融合”、“融合阈值”等术语被用来指间歇性光刺激的频率，在该频率下，会发生从闪烁感知到稳定光感知的转变，反之亦然。
In almost all studies of critical flicker frequency,’or CFF, the method of just noticeable differences, or the method of limits, has been used to obtain individual CFF measures. With this method, the subject reports when a flickering light of gradually increasing frequency just appears steady, and/or when a steady light of gradually decreasing frequency first begins to flicker. A number of such judgments are made, with the average of these transitional, or “critical” frequencies being taken as the individual’s CFF. The widespread use of this method was determined largely by the fact that until very recently, rotating discs were used almost exclusively in studies of visual flicker-fusion. Apparatus of this type did not readily allow quick, accurate changes in frequency, and consequently the use of methods requiring the presentation of discrete stimuli of various constant frequencies was rendered extremely difficult. With the recent development of electronic apparatus permitting rapid and accurate changes in the frequency of a light stimulus, it became possible to explore the use of other methods for determining CFF. Several inherent shortcomings of the just noticeable difference, or jnd, method were encountered by the authors in working with CFF determinations:(a) The jnd method ordinarily requires that the subject observe the changing light stimulus for relatively long exposures (approximately 8-15 seconds), as a result of which several problems arise. Accurately reporting the transition point where the phenomenal experience of “flicker” changes to that of “no flicker” or “steady light,” and vice versa, is a difficult and critical perceptual judgment requiring a high degree of sustained and wellmobilized attention. It is difficult for the subject to maintain such high level, sustained attention during long light exposures. This difficulty is a particularly serious one in determining the CFF of subjects whose capacity* Received in the Editorial Office on August 18, 1952. 1The terms “critical flicker frequency,”“flicker-fusion,”“threshold of fusion,” etc, have been used to refer to the frequency of an intermittent light stimulus at which there occurs a transition from the perception of flicker to the perception of steady light, or vice versa.