数码管式客观闪光融合频率测试仪研制与应用性初步实验分析  

Design and Pilot Experimental Applicability Analysis of Objective Digitron Critical Fusion Frequency Test Apparatus

作　　者：李晓京[1] 胡文东[1] 耿艳[1] 侯小华[1] 马进[1] 

机构地区：[1]航空航天医学教育部重点实验室,西安710032

出　　处：《医疗卫生装备》2010年第6期1-4,共4页Chinese Medical Equipment Journal

基　　金：国家自然科学基金委与民航总局联合资助项目(60879007)

摘　　要：目的:闪光融合频率测试常被作为视觉功能、脑功能、疲劳状态等生理心理学评估的辅助手段。研制一种客观式数码管CFF测试仪,将反应时、正误率等客观性指标引入结果分析与判定,使CFF成为一种可靠的应用性评价指标。方法:下位机采用ATMEL公司的AT89C52单片机为核心,编程分别控制数码管各组成LED段引脚的输出脉冲频率,按设计模式呈现不同的刺激数字,使用专用键盘记录受测者的按键值、答案正误、反应时等心理学指标,可通过USB接口将相关数据发送到PC端应用并以Excel电子表格形式记录下来以供分析。选择13名男性健康青年完成与传统CFF测试仪的对照实验并进行统计分析。结果:仪器综合了闪光临界融合频率和视觉选择反应两项测试指标,采用七段数码管呈现视觉刺激,可提供25～50Hz频率范围内的多种测试模式及较为全面和客观的心理学评价指标。结论:经实验证明,客观性CFF测试能够有效地消除学习效应及主观随意性,提供的心理学统计指标可以用于检验测试的信度及效度,为CFF测试由实验性应用向评判性应用提供了新思路。目前该仪器已在飞行疲劳的检测与预防相关研究中得到应用。Objective To develop a set of Objective Digitron CFF Test Apparatus （ODCTA） with psychological indices such as Reaction Time （RT）,Error Rate （ER） being utilized to help analyzing and evaluating the test result so that CFF test could be applied as a reliable criteria in practice.Methods AT89C52 MCU,made by Atmel Ltd,was selected as the core of the terminal unit.Program was developed to control the output pulse frequency of each LED pin section of a digitron.Consequently,different stimuli digits would appear according to psychological schema requirement.Meanwhile,values of RT,button pressed and correctness were recorded as well as transmitted to PC via USB port to be written into EXCEL format file for further analyzing and processing.13 male youths were selected to participate in the experiment which was designed to identify the applicability of the ODCTA in comparison with the traditional CFF test apparatus.Results The ODCTA,integrated with the indices of both CFF and vision choice reaction tests,provided vision digit stimuli via a 7 sections digitron.It could run with many test patterns as well as a frequency span of 25 -50 Hz,and brought out comprehensive and objective psychological assessment indices.Conclusion It is identified that ODCTA can eliminate the learning effect and subjective randomness efficiently.Statistics indices of the test data can be used to verify the reliability and validity of the test.The study puts forward a new idea for convert experimental application of CFF test to evaluation application.

关 键 词：单片机 数码管 闪光融合频率 视觉反应时 

分 类 号：TH776[机械工程—仪器科学与技术]