Department of Psychological, Health and Territory Sciences, "G.d'Annunzio" University of Chieti and Pescara, Italy.
Department of Psychological, Health and Territory Sciences, "G.d'Annunzio" University of Chieti and Pescara, Italy.
Conscious Cogn. 2020 May;81:102928. doi: 10.1016/j.concog.2020.102928. Epub 2020 Apr 10.
In two successive experiments using the divided visual field paradigm with vertical or horizontal division, two ambiguous figures, the Rubin's vase-face or the Necker cube, were projected to the right and left or to the upper and lower visual hemifields of 108 healthy volunteers. Stimulation time was 120 s. The main hypotheses were (a) that different percepts of the same ambiguous figure may be simultaneously experienced in the two hemifields and (b) that the type (vertical vs. horizontal) of visual field division influences the reversal frequency and the temporal interdependence of the percepts. Results from the first experiment showed that the temporal interdependence of reversals was very low for both ambiguous figures, suggesting that during part of the stimulation time the subjects could experience different percepts of the same figure (e.g. a vase in the right and face profiles in the left visual hemifields). The second experiment showed that this perceptual dissociation occurred on average during one third of the stimulation time. In both experiments the type of visual field division did not influence either frequency or temporal interdependence of the reversals. When one single ambiguous figure was presented in the centre of the screen, the number of reversals was approximately the sum of the reversals observed with two figures presented simultaneously each in one hemifield.
在使用垂直或水平分割的分视范式的两项连续实验中，108 名健康志愿者的右视野和左视野或上视野和下视野分别被投射了两个模棱两可的图形，鲁宾的花瓶-人脸或内克尔立方体。刺激时间为 120 秒。主要假设是：(a) 相同的模棱两可图形的不同感知可能同时出现在两个半视野中；(b) 视觉场分割的类型（垂直与水平）影响感知的反转频率和时间相关性。第一个实验的结果表明，对于两个模棱两可的图形，反转的时间相关性都非常低，这表明在部分刺激时间内，被试可以体验到相同图形的不同感知（例如，在右视野中看到花瓶，而在左视野中看到人脸轮廓）。第二个实验表明，这种感知分离在平均三分之一的刺激时间内发生。在这两个实验中，视觉场分割的类型都没有影响反转的频率或时间相关性。当一个单一的模棱两可的图形被呈现在屏幕的中央时，反转的次数大约是同时呈现两个图形时观察到的反转次数的总和。
