- #SERIAL PORT ERROR PSYSCOPE SERIAL#
- #SERIAL PORT ERROR PSYSCOPE PORTABLE#
- #SERIAL PORT ERROR PSYSCOPE SOFTWARE#
The host computer periodically queries input devices for state changes. On the other hand, USB protocols unlike the PP are based on periodic polling. PCMCIA - PP adapters, however, proved extremely unreliable in the time domain ( ) and therefore may not be a viable alternative.
#SERIAL PORT ERROR PSYSCOPE PORTABLE#
Therefore, the current solution for those people requiring a portable experimental setup is either the use of Personal Computer Memory Card International Association (PCMCIA) adapters or a move to USB technology. Indeed, experiments run outside usual lab settings (such as hospitals, schools, subject’s home, etc.) may require a portable setup. However, a new generation of portable computers offers quite enough power to run most kinds of experiments and in some cases they might even be the platform of choice.
Until some years ago, laptops were not a suitable experimental platform due to an inherent lack of performance. Moreover, laptops no longer include a PP. However, different boards from different manufacturers may have different timing performance ( ) and one must pay particular attention when building a new experimental setup. Most recent motherboards do not even include the PP and one must resort to Peripheral Component Interconnect (PCI) or PCI express external boards.
#SERIAL PORT ERROR PSYSCOPE SERIAL#
Nowadays it has been replaced by other ports such as the Universal Serial Bus (USB). The PP was originally developed to control printers. Nevertheless, the PP is an end of life technology. This port has proven to be a reliable and easy to use solution in psychological and neurophysiological settings (Stewart, 2006 Voss, Leonhart, & Stahl, 2007). These basic I/O tasks are generally handled via the Parallel Port (PP). These triggers are then used by slave systems for synchronization, starting acquisitions or the generation of further commands. Synchronous recordings are typically achieved by relying on a master computer controlling the experimental work-flow and by sending triggers to other computers or external equipment. However, it is always advisable to check, on a case-by-case basis, the timing accuracy of experimental scripts and machines (Plant, Hammond, & Turner, 2004).
#SERIAL PORT ERROR PSYSCOPE SOFTWARE#
In fact, these software environments promise millisecond precision in these operations and are productively used in thousands of labs around the world. Indeed, they often incorporate low level routines and set the highest priority to them. Thus, the advantage of using ECM software is that they are designed for this specific purpose. Previous studies suggest that new generation operating systems are not optimized for timing accuracy (Chambers & Brown, 2003 MacInnes & Taylor, 2001). In recent years, both commercial and open-source software have been proposed for Experimental Control and Management (ECM) such as E-Prime, Presentation, PsyScope, or the PsychToolbox for MatLab, among others.
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