Real-time data collection in Linux: A case study

Finney, Steven A.

doi:10.3758/bf03195362

Cited by 38 publications

(29 citation statements)

References 18 publications

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“…Timing accuracy in multitasking operating systems has received much attention in the psychological research methods literature, and accurate timing is not a problem for Linux-operated computers (Finney, 2001). But even when the Linux system is capable of accurate timing, external devices such as screens, keyboards, and computer mice might affect timing because of their own timing inaccuracies.…”

Section: P Smentioning

confidence: 99%

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PsyToolkit: A software package for programming psychological experiments using Linux

Stoet

2010

Behavior Research Methods

764

463

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Section: P Smentioning

confidence: 99%

“…In order to prevent the computer from running the "while" loop faster than necessary, the "nap" command must be included (Finney, 2001).…”

Section: Stoetmentioning

confidence: 99%

PsyToolkit: A software package for programming psychological experiments using Linux

Stoet

2010

Behavior Research Methods

764

463

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“…For every clip, subjects fixated a central cross, pressed a key to start, at which point the eyetracker was triggered, the cross blinked for 1206 ms, and the clip started. Stimuli were presented on a Linux computer, under SCHED_FIFO scheduling to ensure accurate timing (Finney, 2001). Frame displays were hardware-locked to the vertical retrace of the monitor.…”

Section: Human Eye Movement Experimentsmentioning

confidence: 99%

Quantitative modelling of perceptual salience at human eye position

Itti

2006

Visual Cognition

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We investigate the extent to which a simple model of bottom-up attention and salience may be embedded within a broader computational framework, and compared with human eye movement data. We focus on quantifying whether increased simulation realism significantly affects quantitative measures of how well the model may predict where in video clips humans direct their gaze. We hence compare three variants of the model, tested with 15 video clips of natural scenes shown to three observers. We measure model-predicted salience at the locations gazed to by the observers, compared to random locations. The first variant simply processes the raw video clips. The second adds a gaze-contingent foveation filter. The third further attempts to realistically simulate dynamic human vision by embedding the video frames within a larger background, and shifting them to eye position. Our main finding is that increasing simulation realism significantly improves the predictive ability of the model. Better emulating the details of how a visual stimulus is captured by a constantly rotating retina during active vision has a significant positive impact onto quantitative comparisons between model and human behaviour.

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“…An accurate timer is also required. Finney (2001;see also MacInnes & Taylor, 2001;Stewart, 2006) describes how to ensure that a Linux program meets this standard.…”

Section: Resultsmentioning

confidence: 99%

Millisecond accuracy video display using OpenGL under Linux

Stewart

2006

Behavior Research Methods

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To measure people’s reaction times to the nearest millisecond, it is necessary to know exactly when\ud a stimulus is displayed. This article describes how to display stimuli with millisecond accuracy on a\ud normal CRT monitor, using a PC running Linux. A simple C program is presented to illustrate how this\ud may be done within X Windows using the OpenGL rendering system. A test of this system is reported\ud that demonstrates that stimuli may be consistently displayed with millisecond accuracy. An algorithm\ud is presented that allows the exact time of stimulus presentation to be deduced, even if there are relatively\ud large errors in measuring the display time

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Real-time data collection in Linux: A case study

Cited by 38 publications

References 18 publications

PsyToolkit: A software package for programming psychological experiments using Linux

PsyToolkit: A software package for programming psychological experiments using Linux

Quantitative modelling of perceptual salience at human eye position

Millisecond accuracy video display using OpenGL under Linux

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