Kandel S, Orliaguet J P, Boë L J
Laboratoire de Psychologie Expérimentale, CNRS, Université Pierre Mendès-France, BP 47X, 38040 Grenoble, France.
Perception. 2000;29(8):953-64. doi: 10.1068/p2864.
We investigated how visual processes exploit specific anticipatory movements observed in handwriting gestures. Previous research has shown that the kinematic information contained in the downstroke of an l is exploited to predict the identity of the forthcoming letter. Here, we determined the moment at which prediction takes place. Two between-letter effects were examined: changes in size (ll vs le) and changes in rotation direction (le vs ln). Results show that with only 75% of the l downstroke trajectory (or 60% of the downstroke time) subjects are already capable of predicting the identity of the letter following the l, that is well before the end of the downstroke. Analysis also reveals that identification takes place after the presentation of the movement acceleration phase. The visual perception of motor anticipation seems to involve the detection of motor events.
我们研究了视觉过程如何利用在书写手势中观察到的特定预期动作。先前的研究表明，字母“l”下行笔画中包含的运动学信息被用于预测即将出现的字母的身份。在此，我们确定了进行预测的时刻。研究了两种字母间效应：大小变化（“ll”与“le”）和旋转方向变化（“le”与“ln”）。结果表明，仅凭借字母“l”下行笔画轨迹的75%（或下行笔画时间的60%），受试者就已经能够预测跟随字母“l”之后的字母的身份，即在下行笔画结束之前很久。分析还表明，识别发生在运动加速阶段呈现之后。对运动预期的视觉感知似乎涉及对运动事件的检测。
