Abstract: To test the parafoveal preview effect and to examine the priority of the processing of Chinese reading on the condition of character based sentences or two-character based sentences, Two experiments were conducted using the eye-movement-contingent display change technique. 17 and other 12 junior high school students participated in. Their eye movements were recorded by an SR Eyelink-II head-mounted eye-tracker. A chin rest was provided to minimize head movements. The sampling rate was 500 Hz. Although viewing was binocular, eye movements were recorded from the right eye only. 92sentences were presented in 8viewing conditions(C,C+1R,C+2R,C+3R,C+4R,1L+C+4R,2L+C+4R, the whole line) to examine the character based sentences perceptual span of 17junior high school students in experiment1.And the other 92sentences composed with two-character word were presented in 6viewing conditions(W,W+1R,W+2R,1L+C+2R,2L+C+2R, the whole line) to examine the two-character word based sentences perceptual span of 12junior high school students in experiment2. After the participant had done a standard 9-point grid calibration (and validation), participants read the present experiment instructions. they were instructed to read the sentences for comprehension. At the start of each trial, a calibration dot appeared on the same position of the first character of the reading sentences, and participants were asked to look at it exactly. Then, were asked to press a button on a control pad. After the participant had pressed this button, the sentence appeared. After the participant finished reading the sentence, he/she pressed the button again, the sentence disappeared, and the drift correction dot appear again. Each participant read all 102sentences presented in this experiment. The results are as follows: (1)junior high school students’ perceptual span of Chinese character sentences was 1 character to the left of the fixated word and 2 character to its right, and the perceptual span of Chinese two-character words based sentences reading was 1 two-character word to the left of the fixated word and 1 two-character word to its right. (2)on two-character word based viewing condition, the perceptual span is larger than character based condition sentences. Conclusions: (1)The results indicate that the neighbors of the present fixating word affects the stages of lexical access, an interpretation consistent with E-Z model. (2)Our results favor of Chinese reading is word based processing. It is the new supporting of the idea that Chinese reading processing is word based but not character based.

Key words: perceptual span in reading, character, two-character word, junior high school student, eye movement

摘要： 采用眼动研究中经典的移动窗口技术范式探讨中学生字词阅读知觉广度。通过两个实验分别对17名初中二学生和12名初中二学生进行了汉语字、词阅读知觉广度的眼动研究。实验1结果表明，初中二年级学生字窗口条件下的阅读知觉广度为注视点左侧1个单字到右侧2个单字的范围；实验2结果表明，双字词窗口条件下的阅读知觉广度为注视点左侧1个双字词到右侧1个双字词的范围。本研究推论汉语阅读过程进行的是词单元加工，而不是单字。

关键词: 阅读知觉广度, 字, 双字词, 初中二年级学生, 眼动研究