Black Box IEEE 1284 Guia do Utilizador descarregar pdf (Página 76)

Page 76 of 98 The Black Box Toolkit

The upper trace (L3: E-Prime bitmap display) shows the image being displayed by the

paradigm as detected by the opto-detector attached to the remote PC’s screen. The lower

trace (L7: Left mouse button) shows the simulated mouse response that was generated by

the DSCAR in response to detecting the stimulus image. Note the time base shown in

milliseconds across the full extent of the plot. Actual illumination durations detected by the

opto-detector are shown in the spreadsheet. Here the line 3 duration is around 3

milliseconds. As we were using a CRT this is the duration the phosphor stayed illuminated

as the CRTs beam scanned down the screen every 10ms at a refresh rate of 100Hz.

Should we have used a TFT or data projector these would show the actual display

duration as there is no refresh produced by these devices.

If we scroll the spreadsheet across to show the details for the mouse on line 7 we can see

that the durations were very close to the intended button down duration of 150ms.

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Black Box IEEE 1284 Guia do Utilizador Página 76