Ballesteros S, Millar S, Reales J M
Departamento de Psicología Básica II, Ciudad Universitaria S/N, Universidad Nacional de Educaión a Distancia, Madrid, Spain.
Percept Psychophys. 1998 Apr;60(3):389-404. doi: 10.3758/bf03206862.
Four experiments tested the hypothesis that bilateral symmetry is an incidental encoding property in vision, but can also be elicited as an incidental effect in touch, provided that sufficient spatial reference information is available initially for haptic inputs to be organized spatially. Experiment 1 showed that symmetry facilitated processing in vision, even though the task required judgments of stimulus closure rather than the detection of symmetry. The same task and stimuli failed to show symmetry effects in tactual scanning by one finger (Experiment 2). Experiment 3 found facilitating effects for vertically symmetric open stimuli, although not for closed patterns, in two-forefinger exploration when the forefingers had previously been aligned to the body midaxis to provide body-centered spatial reference. The one-finger exploration condition again failed to show symmetry effects. Experiment 4 replicated the facilitating effects of symmetry for open symmetric shapes in tactual exploration by the two (previously aligned) forefingers. Closed shapes again showed no effect. Spatial-reference information, finger movements, and stimulus factors in shape perception by touch are discussed.
双侧对称性在视觉中是一种附带的编码属性，但在触觉中也可作为一种附带效应被引发，前提是最初有足够的空间参考信息，以便触觉输入能够在空间上进行组织。实验1表明，对称性促进了视觉处理，尽管任务要求对刺激的闭合性进行判断，而不是检测对称性。相同的任务和刺激在单指触觉扫描中未显示出对称性效应（实验2）。实验3发现，在前额先前已与身体中轴线对齐以提供以身体为中心的空间参考的双指探索中，垂直对称的开放刺激有促进作用，但闭合图案则没有。单指探索条件再次未显示出对称性效应。实验4重复了在双指（先前对齐）触觉探索中对称性对开放对称形状的促进作用。闭合形状再次未显示出效果。文中讨论了触觉形状感知中的空间参考信息、手指运动和刺激因素。
