复杂图形表象产生的认知加工机制

The Cognitive Generation Mechanism of Complex Picture Visual Image

采用Kosslyn双任务分离的研究范式,通过两个实验考察了复杂图形表象产生的认知加工机制。实验1提出了当要求被试在产生动物的部分表象时,大脑左半球明显反应更快;而当要求被试产生客体整体特征的表象时,并没有出现大脑半球的优势效应。实验2采用控制任务进一步证实大脑两半球不同的优势效应,研究发现当同样的任务以知觉形式完成时,没有大脑半球的优势效应。实验结果表明,在复杂图形表象产生的过程中,当产生部分表象时,大脑左半球有显著优势;而当产生整体表象时,两半球起同样作用。此结果进一步拓展了Kosslyn提出的大脑半球专门化假说。

With the two-task dissociated paradigm that Kosslyn used,two behavior experiments were conducted to reveal the hemispheric lateralization of structures generating the details and the holistic properties of mental images.In the first experiment the left hemisphere was faster in discriminating at an imagery level whether animals had short or long tails.No hemispheric dominance was found when the imagery task required the discrimination of the holistic features of objects and a decision of whether their heights were greater than their widths,or vice versa.In the second experiment,which was a control task,no hemispheric dominance was found when the same tasks had to be performed perceptually.The present results suggest that multipart mental images are generated by the left hemisphere and skeletal images by both hemispheres.