E-Prime 1.2 Stimulus Device Response Timing Values


The following is a table of average and standard deviation results for the timing test paradigms used by PST to determine device latency. The experiment presented a square stimulus in the middle of the screen for 100 trials. The refresh detector connected to The Black Box Toolkit accepted the stimulus which in turned fired a stimulus event 100ms later to trigger electronic components connected to the devices to mimic a human response. In addition to the 100ms delay value from when the stimulus was presented a 5ms value was subtracted from the received RT value because the experiment station was running at 100hz and the stimulus was presented in the middle of the screen. For example, if the RT value was 225.45, the actual RT would be 225.45 - 100 - 5 = 120.45.


The experiment used E-Prime 1.2.1.800 in Spring of 2006. The Black Box Toolkit was used to collect and fire the response simulation values. The response box used was a PST Serial Response Box Model 200a. It was used connected via the UART COM port as well as using a Aten UC232A USB to Serial cable. Information about the paradigm used as well as specifics on the devices used or altered to simulate the responses and machines used to collect the data available upon request and intended to be posted to this timing site in future revisions. The same tests were run with an HP ZD7000 laptop running E-Prime 1.2 that collected the stimulus with a refresh detector attached to the SRBOX as well as simulating the response 100ms later. Unlike the subtraction for 1/2 the screen refresh, the latency values inherent via the SRBOX have not be subtracted from the E-Prime Timing Station tables which result in an approximate 2ms increase in the average values.


Since the original release of E-Prime in 2001, overall machine speed increases and enhancements have occurred in keyboard and mouse hardware technology to improve the average and stdev values of mouse and keyboard devices. The values reinforce that a device average and stddev values can vary between machine and operating system. In addition as outlined in "How choice of mouse may affect response timing in psychological studies" (Plant R.R.; Hammond N.; Whitehouse T, May 2003), the timing characteristics of exact model devices (e.g. as extreme as purchasing two Microsoft USB Intellimouse from the same vendor) can also have varying timing characteristics.


Dell Dimension 8400 (3.0 GHZ) Timing Station: HP ZD7000 laptop with The Black Box Toolkit

Operating System

Response Device Expected

Data

Total

Windows XP

Keyboard (PS/2 Gateway)

Average

23.48

StdDev

2.80

Keyboard (USB Belkin)

Average

39.84

StdDev

8.30

Keyboard (USB Dell)

Average

13.98

StdDev

0.74

Mouse (PS/2 Microsoft Ball)

Average

23.40

StdDev

2.95

Mouse (USB Interex)

Average

14.01

StdDev

0.70

Mouse (USB Microsoft Intellimouse Infrared)

Average

17.60

StdDev

2.52

Parallel Port

Average

0.16

StdDev

0.37

SRBOX (Serial Model 200a)

Average

1.84

StdDev

0.61

SRBOX (USB2Serial Model 200a)

Average

1.99

StdDev

0.66


Dell Dimension 8200 (2.4 GHZ) Timing Station: HP ZD7000 laptop with The Black Box Toolkit

Operating System

Response Device Expected

Data

Total

Windows XP

Keyboard (PS/2 Gateway)

Average

31.74

StdDev

3.26

Keyboard (USB Belkin)

Average

46.20

StdDev

8.56

Keyboard (USB Dell)

Average

19.42

StdDev

3.67

Mouse (PS/2 Microsoft Ball)

Average

35.68

StdDev

4.06

Mouse (USB Interex)

Average

28.00

StdDev

5.23

Mouse (USB Microsoft Intellimouse Infrared)

Average

31.30

StdDev

5.95

Parallel Port

Average

0.09

StdDev

0.29

SRBOX (Serial Model 200a)

Average

1.73

StdDev

0.68

SRBOX (USB2Serial Model 200a)

Average

1.85

StdDev

0.66


NOTE: The tables above used a HP ZD7000 with The BlackBox Toolkit as the Timing Station.

The tables below used a HP ZD7000 laptop using E-Prime as the Timing Station.


Dell Dimension 8400 (3.0 GHZ) Timing Station: HP ZD7000 Laptop running E-Prime 1.2.1.800

Operating System

Response Device Expected

Data

Total

Windows ME

Keyboard (PS/2 Gateway)

Average

25.91

StdDev

2.88

Keyboard (USB Dell)

Average

13.62

StdDev

0.76

Mouse (USB Microsoft Intellimouse Infrared)

Average

19.55

StdDev

2.40

Parallel Port

Average

2.16

StdDev

0.70

SRBOX (Serial Model 200a)

Average

2.47

StdDev

0.80

Windows XP

Keyboard (PS/2 Gateway)

Average

25.65

StdDev

3.03

Keyboard (USB Belkin)

Average

39.84

StdDev

8.30

Keyboard (USB Dell)

Average

13.98

StdDev

0.72

Mouse (PS/2 Microsoft Ball)

Average

23.40

StdDev

2.95

Mouse (USB Interex)

Average

14.01

StdDev

0.70

Mouse (USB Microsoft Intellimouse Infrared)

Average

19.77

StdDev

2.52

Parallel Port

Average

2.18

StdDev

0.92

SRBOX (Serial Model 200a)

Average

3.71

StdDev

1.01

SRBOX (USB2Serial Model 200a)

Average

1.99

StdDev

0.66

USB Mouse Interex

Average

17.70

StdDev

2.40


Dell Dimension 8200 (2.4 GHZ) Timing Station: HP ZD7000 Laptop running E-Prime 1.2.1.800

Operating System

Response Device Expected

Data

Total

Windows ME

Keyboard (PS/2 Gateway)

Average

25.42

StdDev

2.89

Keyboard (USB Dell)

Average

12.87

StdDev

0.71

Mouse (USB Microsoft Intellimouse Infrared)

Average

19.40

StdDev

2.32

Parallel Port

Average

2.22

StdDev

0.70

SRBOX (Serial Model 200a)

Average

2.60

StdDev

0.82

Windows XP

Keyboard (PS/2 Gateway)

Average

32.90

StdDev

3.79

Keyboard (USB Belkin)

Average

46.20

StdDev

8.56

Keyboard (USB Dell)

Average

22.28

StdDev

3.52

Mouse (PS/2 Microsoft Ball)

Average

35.68

StdDev

4.06

Mouse (USB Interex)

Average

28.00

StdDev

5.23

Mouse (USB Microsoft Intellimouse Infrared)

Average

32.67

StdDev

5.22

Parallel Port

Average

2.07

StdDev

0.93

SRBOX (Serial Model 200a)

Average

3.73

StdDev

1.10

SRBOX (USB2Serial Model 200a)

Average

1.85

StdDev

0.66


Micron PIII-866 Timing Station: HP ZD7000 Laptop running E-Prime 1.2.1.800

Operating System

Response Device Expected

Data

Total

Windows 2000

Keyboard (PS/2 Gateway)

Average

37.50

StdDev

4.36

Keyboard (USB Dell)

Average

25.37

StdDev

4.22

Mouse (PS/2 Microsoft Ball)

Average

48.85

StdDev

17.56

Mouse (USB Microsoft Intellimouse Infrared)

Average

35.53

StdDev

13.29

Parallel Port

Average

2.21

StdDev

0.70

SRBOX (Serial Model 200a)

Average

4.02

StdDev

0.83

Windows ME

Keyboard (PS/2 Gateway)

Average

26.09

StdDev

2.54

Keyboard (USB Dell)

Average

13.99

StdDev

2.55

Mouse (USB Microsoft Intellimouse Infrared)

Average

21.63

StdDev

2.24

Parallel Port

Average

2.32

StdDev

0.70

SRBOX (Serial Model 200a)

Average

2.59

StdDev

0.89

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