|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
¿ Features ¿ Pricing |
The PST Serial Response Box features a 0 millisecond debounce period. This is something that simply cannot be achieved from a standard keyboard!
PST has engineered the PST Serial Response Box so that the response is time stamped and then the signal is verified for accuracy.
A standard keyboard
verifies the accuracy of the signal before the response is time stamped. The
problem of variable debounce periods found on keyboards is solved with the
PST
Serial Response Box!
Best of all,
the PST Serial Response Box connects directly to the PC via the serial
port! No additional hardware is required.
¿
Refresh Detector System
The PST Serial Response Box
includes a Refresh Detector System which is used to determine how many times a second the computer
screen is redrawn or refreshed.
¿
Keys
The
PST Serial Response Box
features 5 keys. Single key presses, key presses and releases as well as
n-key rollover responses (e.g., collect information about key responses
which overlap in time) are supported. The number of keys can be
increased to 8 for use with E-Prime via the integrated expansion port
(see the
Custom
Expansion Kit). The keys can be labeled in accordance with
your experiment. Place a label inside the keycaps of the PST Serial
Response Box's 5 keys. PST ships 5 sheets of labels with every PST
Serial Response Box ordered.
¿ Lamps
The PST Serial Response Box features 5 lamps. A sample of 5 colored lamp covers are also included with the PST Serial Response Box. The lamp covers are easily interchangeable.
¿
Voice Key
The PST Serial Response Box also features an integrated voice key. The voice
key allows you to collect vocal latencies with confidence. This is not to be
confused with the ability to record actual vocal responses. To record vocal
responses we suggest the use of an external recorder. The voice key features
both a hardware volume control and sensitivity control via E-Prime.
¿ IBM compatible PC (386SX-16, 486 or Pentium) using MS-DOS v5.0 or greater
¿ 1 Serial port (9600/19.2K baud transfer rate - jumper selectable)
¿ E-Prime v1.x or higher
¿ 1 MB RAM
1 PST Serial Response Box with textured scratch resistant metal case
5 Lamps
5 Sample lamp covers (Red, White, Blue, Green and Yellow)
5 Keys with over 150 customized key labels
1 Voice key with programmable trip level and microphone
1 RS-232 cable with DB-25 connectors
1 DB-9 to DB-25 adapter
1 12V DC power supply (800mA)
1 40-pin IDH expansion cable with header (to expand the number of keys and lamps via the expansion port)
Refresh detector circuitry (for use with PST Refresh Detector)
Custom Expansion Kit
The Custom Expansion Kit allows you the flexibility to create your very own response collection device!
The PST Serial Response Box Custom Expansion Kit enables you to make a custom key and lamp configuration and interface it to the PST Serial Response Box. With the Custom Expansion Kit you can design your own layout of up to 8 switches for use with E-Prime, and then connect this layout via the expansion cable to the Serial Response Box circuitry. Any set of switches and lamps can be connected via the expansion cable, but the Custom Expansion Kit combines everything you would need into a single purchase! The Custom Expansion Kit combines the benefits of the Serial Response Box timing circuitry with your own switch and lamp layout.
The Custom Expansion Kit for the PST Serial Response Box is available from Psychology Software Tools. The kit consists of the following items*:
¿ Eight drill-mount switches
¿ Eight switch caps
¿ Five lamps
¿ Five lamp lenses
¿ One prototyping board
¿ One Interface cable
¿ Drill bits for switches and lamps
¿ Mounting hardware and case (10" x 8.03" x 2.70")
¿ Instructions for building your own response collection device with the Custom Expansion Kit and the PST Serial Response Box.
* E-Prime is only able to expand up to 8 keys. E-Prime is restricted to only 5 lamps.
As an alternative to vocal latency or a key press to collect your subject's response, you may utilize our Foot Pedal. Collect your subject's foot response through a Foot Pedal that connects to the PST Serial Response Box through the integrated expansion port.
The PST Refresh Detector System is used to determine how many times a second the computer screen is redrawn or refreshed. A typical computer screen is refreshed (redrawn) between 60 and 90 times a second. The refresh rate is a function of the brand of the monitor, the type of computer video card driving the monitor, and the graphics or text mode that the computer is using. Refresh rates are normally reported in the video card and monitor documentation in hertz (Hz), which provides the time in milliseconds for one complete refresh of the screen (e.g., a refresh rate of 60 Hz equates to 16.67 msec per refresh). Precise timing information of screen refresh is crucial to experiments that use very short duration stimulus display times. The Refresh Detector is a phototransistor that mounts to your computer screen using suction cups and a mounting bracket and connects to a special port on the back of the PST Serial Response Box. When placed over a brightly lit section of the monitor screen, the phototransistor pulses each time the screen is refreshed. These pulses are amplified and linked into the key number 7 circuitry. The circuitry produces a 3.5 millisecond TTL pulse each time the phototransistor pulses. As with the voice key, the Refresh Detector looks like a 3.5 millisecond key press. This feature allows for the precise timing of screen vertical refresh (or redraw time).
Why do I need it?
The PST Refresh Detector System was designed for use in conjunction with the PST Serial Response Box and E-Prime. It is used to determine how many times per second the computer screen is redrawn or refreshed.
The PST Refresh Detector System is quite useful for experiments with very brief display durations (i.e. under 100 milliseconds). It is critical that you take your hardware (as it relates to your experimental design and stimulus presentation) into consideration. The PST Refresh Detector System allows the researcher to find out the precise timing of their screen’s refresh rate (or redraw time).
Precise timing information of screen refresh is crucial to experiments that use very short display times. For example: if you wanted to run an experiment in which the subject is presented with a word on the computer screen for less than 30 milliseconds, it would be very important to know if your monitor could refresh a screen that quickly. That is, you must determine if your computer hardware is capable of presenting the word and then erasing or masking the word (two screen updates) within 30 milliseconds.
¿ The PST Refresh Detector System is a phototransistor that mounts to your computer screen using suction cups and a mounting bracket. It connects to a special port on the back of the PST Serial Response Box.
¿ When placed over a brightly lit section of the monitor screen, the phototransistor pulses each time the screen is refreshed. A typical computer screen is refreshed (redrawn) between 60 and 90 times every second.
¿ The monitor’s refresh rate is a function of the brand of the monitor, the type of video card driving the monitor, the mode (graphics or text) and the current video resolution the computer is using.
¿ Refresh rates are normally reported in the video card and monitor documentation in hertz (Hz), (e.g., a refresh rate of 60 Hz equates to 16.67 msec per refresh).
¿ The Refresh Detector System also includes a set of o-scope leads which allow you to examine the wave form generated by the phototransistor directly with external hardware (i.e. oscilloscope).
Testing of the Refresh Detector system should be done in a low ambient light conditions. Bright background light can interfere with the Refresh Detector and cause erroneous readings.
SRBOX Sample For E-Prime (127KB self extracting zip file)
An E-Studio experiment testing SRBOX functionality and illustrating use of the SRBOX with E-Prime.SRBOX Configuration for DOS (459KB self extracting zip file)
Standard DOS application to configure and test the SRBOX for use with MEL Professional v2.x experiments.
Please contact PST contact PST with the following information to obtain a formal quote.
Name of Institution
End User
Shipping Address
Fax Number
Phone Number
Name of Product & Quantity
| Description | Price (US Dollars) |
|---|---|
| Deluxe Serial Response Box includes the Refresh Detector System |
$450.00 |
| Custom Expansion Kit |
$150.00 |
| Foot Pedal |
$39.00 |
All prices are provided in US funds. Prices do not include the cost of shipping and handling and are subject to change without notice.
