Development and experimental evaluation of psychophysical models of uncertainty and multidimensionality

本研究的目的是建立一个包含刺激不确定性和多维感觉尺度的心理物理学模型，并在心理物理学实验中检验刺激不确定性和多维性的影响。我们将感觉幅度的方差表示为刺激不确定性的函数，并在多维空间中建模感觉分布和判断标准。由于技术上的困难，该模型尚未完成，在实验中，我们操纵了目标音频率和空间位置的不确定性，并考察了两个维度之间的相互作用对强度分辨率的影响。结果表明，在任何一个维度上的不确定性都会降低强度分辨率，并且频率提示的效果取决于位置的不确定性（Futakuchi等人，印刷中;在视觉搜索实验中，我们还研究了空间位置和亮度对方向敏感性的相互作用。结果表明，方向灵敏度取决于位置的不确定性，亮度和对比度的背景（森，Kataoka，和草野，提交; Ohtani和森，提交）。

The purpose of this research project was to develop psychophysical models incorporating stimulus uncertainty and multi-dimensional sensory scales, and to examine the effects of stimulus uncertainty and multi-dimensionality in psychophysical experiments.In the model development, stimulus uncertainty and multi-dimensionality was incorporated into a Thurstonian model. We expressed variance of sensory magnitude as a function of stimulus uncertainty, and modeled sensory distributions and judgment criteria in multidimensional space. Due to technical difficulties, the model has not been completed yet.In the experiments, we manipulated uncertainty in frequency and spatial location of target tones, and examined the interaction between the two dimensions on intensity resolution. The results showed that uncertainty in either dimension lowered intensity resolution, and that the effects of frequency cueing depended on location uncertainty (Futakuchi et al., in press ; Futakuchi ＆ Mori, submitted ; Mori ＆ Futakuchi, 1999).We also examined the interaction of spatial location and luminance on orientation sensitivity in visual search experiments. The results showed that orientation sensitivity depended on location uncertainty, luminance, and contrast against the background (Mori, Kataoka, ＆ Kusano, submitted ; Ohtani ＆ Mori, submitted).