A free, easy-to-use, computer-based simple and four-choice reaction time programme: the Deary-Liewald reaction time task

Reaction time tasks are used widely in basic and applied psychology. There is a need for an easy-to-use, freely available programme that can run simple and choice reaction time tasks with no special software. We report the development of, and make available, the Deary-Liewald reaction time task. It is initially tested here on 150 participants, aged from 18 to 80, alongside another widely used reaction time device and tests of fluid and crystallised intelligence and processing speed. The new task’s parameters perform as expected with respect to age and intelligence differences. The new task’s parameters are reliable, and have very high correlations with the existing task. We also provide instructions for downloading and using the new reaction time programme, and we encourage other researchers to use it.     

A microprocessor reaction time laboratory

The hardware and software required to implement a multiple-subject microprocessor-based laboratory are described. A basic stimulus-probe reaction time paradigm encompasses a wide range of cognitive psychology experiments and requires little or no sophistication to use.     

PC-PVT: A platform for psychomotor vigilance task testing,analysis, and prediction

Using a personal computer (PC) for simple visual reaction time testing is advantageous because of the relatively low hardware cost, user familiarity, and the relative ease of software development for specific neurobehavioral testing protocols. However, general-purpose computers are not designed with the millisecond-level accuracy of operation required for such applications. Software that does not control for the various sources of delay may return reaction time values that are substantially different from the true reaction times. We have developed and characterized a freely available system for PC-based simple visual reaction time testing that is analogous to the widely used psychomotor vigilance task (PVT). In addition, we have integrated individualized prediction algorithms for near-real-time neurobehavioral performance prediction. We characterized the precision and accuracy with which the system as a whole measures reaction times on a wide range of computer hardware configurations, comparing its performance with that of the “gold standard” PVT-192 device. We showed that the system is capable of measuring reaction times with an average delay of less than 10 ms, a margin of error that is comparable to that of the gold standard. The most critical aspect of hardware selection is the type of mouse used for response detection, with gaming mice showing a significant advantage over standard ones. The software is free to download from http://bhsai.org/downloads/pc-pvt/.     

Experimental RunTime System: Software for developing and running reaction time experiments on IBM-compatible PCs

The Experimental RunTime System (ERTS) is a recent addition to the small collection of commercial software packages available for writing and running reaction time experiments on IBM-compatible PCs. Experiments are written using any text editor and a relatively small set of ERTS commands. Millisecond timing is provided by a software timer with no additional hardware requirements. All displays are in high-resolution VGA graphics. The Creative Labs Soundblaster card is supported in 16-bit mode, but is not required for simple tone generation. Voice-key support is available via the Soundblaster card. Keyboard, mouse, and external keys may be used as reaction keys, and the mouse or a joystick may be used as a tracking device. The stimulus-centered design and powerful display control commands of ERTS make it appropriate for developing a wide range of trial-based experiments.     

Control of CRT intensity via Apple II software

An inexpensive, easy-to-build device for the Apple II microprocessor is described. The modification permits software control of four levels of relative screen intensity (contrast) settings for any video monitor. The relationship of the technology to choice reaction time and perception research is briefly indicated. Principles governing operation of the modification are also discussed. Finally, a set of step-by-step instructions for building the device is provided.     

Metronome LKM: An open source virtual keyboard driver to measure experiment software latencies

Experiment software is often used to measure reaction times gathered with keyboards or other input devices. In previous studies, the accuracy and precision of time stamps has been assessed through several means: (a) generating accurate square wave signals from an external device connected to the parallel port of the computer running the experiment software, (b) triggering the typematic repeat feature of some keyboards to get an evenly separated series of keypress events, or (c) using a solenoid handled by a microcontroller to press the input device (keyboard, mouse button, touch screen) that will be used in the experimental setup. Despite the advantages of these approaches in some contexts, none of them can isolate the measurement error caused by the experiment software itself. Metronome LKM provides a virtual keyboard to assess an experiment’s software. Using this open source driver, researchers can generate keypress events using high-resolution timers and compare the time stamps collected by the experiment software with those gathered by Metronome LKM (with nanosecond resolution). Our software is highly configurable (in terms of keys pressed, intervals, SysRq activation) and runs on 2.6–4.8 Linux kernels.     

Fitting the ratcliff diffusion model to experimental data

Many experiments in psychology yield both reaction time and accuracy data. However, no off-the-shelf methods yet exist for the statistical analysis of such data. One particularly successful model has been the diffusion process, but using it is difficult in practice because of numerical, statistical, and software problems. We present a general method for performing diffusion model analyses on experimental data. By implementing design matrices, a wide range of across-condition restrictions can be imposed on model parameters, in a flexible way. It becomes possible to fit models with parameters regressed onto predictors. Moreover, data analytical tools are discussed that can be used to handle various types of outliers and contaminants. We briefly present an easy-touse software tool that helps perform diffusion model analyses.     

A tachistoscopic software system for use in remote timesharing applications

A program is described that permits the use of an Imlac PDS-1 display computer, in conjunction with a host timeshare system, as a software-controlled tachistoscope. Alphanumeric and graphic message strings are received from the host computer over a telephone line, and are then displayed for specified periods of time in sequence. The display computer records the S’s responses and reaction time and reports this information back to the host computer for recording and analysis. The system is designed so that the burden of software development for the realization of a specific experimental plan is shifted to the large-capacity host machine, and it can utilize all of the features of standard FORTRAN as implemented on the host computer system.     

Diffusion model analysis with MATLAB: A DMAT primer

The Ratcliff diffusion model has proved to be a useful tool in reaction time analysis. However, its use has been limited by the practical difficulty of estimating the parameters. We present a software tool, the Diffusion Model Analysis Toolbox (DMAT), intended to make the Ratcliff diffusion model for reaction time and accuracy data more accessible to experimental psychologists. The tool takes the form of a MATLAB toolbox and can be freely downloaded from ppw.kuleuven.be/okp/dmatoolbox. Using the program does not require a background in mathematics, nor any advanced programming experience (but familiarity with MATLAB is useful). We demonstrate the basic use of DMAT with two examples.     

Runword: An IBM-PC software package for the collection and acoustic analysis of speeded naming responses

Researchers generally collect two dependent measures from most types of speeded responses: reaction time and error proportion. Recently, experimenters have tested lexical theories using alternative empirical measures, such as response force in decision tasks and response duration in naming tasks. We offer a set of software tools that expands the battery of dependent measures normally available to naming experimenters to include various duration and intensity measures of digitized voice recordings. This article explains the functionality, programming logic, and theoretical motivation behind each measure, as well as the software to support digitized naming experiments. The software runs in DOS on IBM-PC-compatible hardware with SoundBlaster 16-bit sound cards, and it takes advantage of the decreasing costs of hard-drive space and digital sound cards.     

Tachistoscopic timing on the TRS-80

A hardware/software system is described that enables the TRS-80 Model I microcomputer to be used as a tachistoscope. The system synchronizes stimulus presentation with the 16.7-msec scanning rate of the cathode-ray tube. Hardware and software configurations for reaction timing and stimulus presentation are presented and discussed.     

大学生文化倾向性与姓名知觉反应时的关系

摘要 本文采用问卷调查和字词辨别反应时任务的方法,考察了大学生对个体姓名信息反应时与文化倾向性之间的关系。结果表明：（1）自陈式《垂直、水平个人-集体主义问卷》的集体主义维度上具有较低的区分效度,有待改善;（2）在视觉通路中,个体对自我的姓名、姓、名的加工时均具有一定的优先性,并发现个体对自我姓名的知觉模式为整体知觉;（3）姓名信息所蕴含的文化信息与文化倾向问卷中所测量的信息具有一定的相关,支持并验证了文化倾向问卷的内容效度;同时研究发现姓、名作为自我结构的标识物比姓名更佳。     

Experimental control programs for the UNIX operating system

The software described runs on Version 7 UNIX, although most run on earlier versions. Using the curses package requires two program libraries from the Fourth Berkeley Distribution (CURSES and TERMLIB). Using any of the functions requires knowledge of programming, preferably in C (Kernighan & Richie, 1978), but the sample experimental control program is usable by nonprogrammers. Because no special hardware is assumed, the resolution of timed presentations and reaction time recordings may not be accurate enough for some purposes. Functions for stimulus presentation have a resolution of 1 sec, and those for timing responses are accurate to about 17 msec.     

The Walter Reed palm-held psychomotor vigilance test

This field-portable reaction time test and analysis software run on devices using the Palm operating system. It is designed to emulate a test and commercial device widely used in sleep deprivation, shift work, fatigue, and stimulant drug research but provides additional capabilities. Experimental comparisons with the standard commercial device in a 40-hour total sleep deprivation study show it to be comparably sensitive to selected experimental variables. A Pocket PC-compatible version is under developement.     

MouseTracker: Software for studying real-time mental processing using a computer mouse-tracking method

In the present article, we present a software package, MouseTracker, that allows researchers to use a computer mouse-tracking method for assessing real-time processing in psychological tasks. By recording the streaming x-, y-coordinates of the computer mouse while participants move the mouse into one of multiple response alternatives, motor dynamics of the hand can reveal the time course of mental processes. MouseTracker provides researchers with fine-grained information about the real-time evolution of participant responses by sampling 60–75 times/sec the online competition between multiple response alternatives. MouseTracker allows researchers to develop and run experiments and subsequently analyze mouse trajectories in a user-interactive, graphics-based environment. Experiments may incorporate images, letter strings, and sounds. Mouse trajectories can be processed, averaged, visualized, and explored, and measures of spatial attraction/curvature, complexity, velocity, and acceleration can be computed. We describe the software and the method, and we provide details on mouse trajectory analysis. We validate the software by demonstrating the accuracy and reliability of its trajectory and reaction time data. The latest version of MouseTracker is freely available at http://mousetracker.jbfreeman.net.     

gSRT-Soft: A generic software application and some methodological guidelines to investigate implicit learning through visual-motor sequential tasks

Serial reaction time tasks and, more generally, the visual-motor sequential paradigms are increasingly popular tools in a variety of research domains, from studies on implicit learning in laboratory contexts to the assessment of residual learning capabilities of patients in clinical settings. A consequence of this success, however, is the increased variability in paradigms and the difficulty inherent in respecting the methodological principles that two decades of experimental investigations have made more and more stringent. The purpose of the present article is to address those problems. We present a user-friendly application that simplifies running classical experiments, but is flexible enough to permit a broad range of nonstandard manipulations for more specific objectives. Basic methodological guidelines are also provided, as are suggestions for using the software to explore unconventional directions of research. The most recent version of gSRT-Soft may be obtained for free by contacting the authors.     

Timing accuracy under Microsoft Windows revealed through external chronometry

Recent studies by Myors (1998, 1999) have concluded that the Microsoft Windows operating system is unable to support sufficient timing precision and resolution for use in psychological research. In the present study, we reexamined the timing accuracy of Windows 95/98, using (1) external chronometry, (2) methods to maximize the system priority of timing software, and (3) timing functions with a theoretical resolution of 1 msec or better. The suitability of various peripheral response devices and the relative timing accuracy of computers with microprocessors with different speeds were also explored. The results indicate that if software is properly controlled, submillisecond timing resolution is achievable under Windows with both old and new computers alike. Of the computer input devices tested, the standard parallel port was revealed as the most precise, and the serial mouse also exhibited sufficient timing precision for use in single-interval reaction time experiments.     

Biomarkers, health, lifestyle, and demographic variables as correlates of reaction time performance in early, middle, and late adulthood

We aimed to identify demographic, health, and biomarker correlates of reaction time performance and to determine whether biomarkers explained age differences in reaction time performance. The sample comprised three representative cohorts aged 20-24, 40-44, and 60-64 years, including a total of 7,485 participants. Reaction time measures of intraindividual variability and latency were used. The measure of intraindividual variability used was independent of mean reaction time. Older adults were more variable than younger adults in choice reaction time performance but not simple reaction time performance. The most important correlates of reaction time performance after gender and education were biological markers such as forced expiratory volume at one second, grip strength, and vision. Few measures of physical or mental health or lifestyle were associated with poorer performance on reaction time measures. Biomarkers explained the majority of age-related variance in simple reaction time and a large proportion of variance in choice reaction time. We conclude that for the ages studied, biomarkers are more important than health factors for explaining age differences in reaction time performance.     

Real-time generation of random-element motion displays

Random-element motion patterns for visual research, in which a set of the elements are shifted uniformly on successive exposures, can be generated in real time on a CRT display, using a relatively low-cost, commercially available display processor (Sigma QVEC). The software achieves economy of time by not rewriting large amounts of the display file for each exposure. Instead it changes only the “chaining addresses” that determine the order in which strips of the display are arranged. Further features of the hardware and software are described.