Lumina fMRI Response Pads

Lumina Controller Features

Under the hood, the Lumina controller packs a lot of power, much more than is apparent at first glance. All the features described below can be set once using the XID Control Panel program and then stored in non-volatile memory inside the controller.

Timing

Lumina provides the following timing capabilities. All timers have a one (1) millisecond resolution.

Feature	What It Does
Reaction Time Timer	Measures the patient's reaction time. The timer is triggered by the computer.
Experiment Timer	An experiment-wide timer is provided. The computer can reset this timer and inquire at any moment about how much time has elapsed.
Trial Alarm	Some experiments require that a trial begins at fixed, precise intervals. Lumina provides a trial triggering capability. The computer sets the period, e.g. 700 milliseconds, and then simply waits for the trigger to arrive from Lumina. Of course, a trial can also be triggered by Lumina's fMRI scanner input.
Port Test Timer	Intended to measure any transmission delays that may be introduced by the operating system or USB-to-serial port converters.

Accessory Connector

Lumina sports an Accessory Connector that can be configured in many ways and entirely via software. It can function in one of two modes: Reflective or General Purpose.

When in Reflective Mode, the pins on the Accessory Connector reflect the status of the response pads' push buttons. The following options are offered:

Reflective Mode	When a Push Button is Pressed...
Continuous	...the corresponding pin on the Accessory Connector goes high and stays high until the push button is released.
Single Pulse Mode	...a single pulse is sent on the corresponding pin. The pulse's duration can be adjusted. This mode works well with products from Neuroscan and Brain Products GmbH.
Double Pulse Mode	...a pulse is sent on the corresponding pin; when the push button is released, a second pulse is sent.

Two additional features are available when in Reflective Mode:

A pin on the Accessory Connector provides an "OR" output. It goes high when any push button is pressed. This feature helps make Lumina compatible with systems from Cambridge Research Systems.
The logic of the output pins can be set to active high or active low.

When in General Purpose Mode, the Accessory Connector can be used for general purpose input/output (I/O) operations.

Any I/O lines can be used for either input or output.
Lines selected for input can be pulled high or pulled low.

Serial Port

Lumina's serial port operates at 9600, 19200, 38K, 56K, or 110K baud. Four different data communication protocols are currently supported:

Lumina / XID. This mode supports all the timing features described above.
Cedrus RB Series mode. This mode emulates the popular Cedrus RB Series response pads.
E-Prime / MEL mode.
ASCII / MEDx mode.

More information can be found on the Supported Applications page. Cedrus can also modify Lumina's firmware to support your own application. OEM inquiries are welcome.

Miscellaneous

An additional feature allows the user to lock the Mode and Switch push buttons on the back of the Lumina controller to prevent an accidental change.