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Specifications

Specifications

Lumina 3G Controller Specifications

USB

The USB port can operate in one of two modes: Keyboard or Standard:

  • In Keyboard mode (also known as HID mode), your computer “sees” the controller as a keyboard, making it possible for any program to handle the controller’s output. Key press and scanner triggers can be sent to computer in different preset formats, selected from the front panel. No driver installation is necessary.
  • In Standard mode, your computer “sees” a device that is connected as a serial communications port. It is supported by several programs like SuperLab, E-Prime, Presentation, Inquisit, and others; C++ and Python libraries are also available.

Several protocols (data formats) are supported and can be selected from the front panel. Supported baud rates are 115200, 57600, 19200, and 9600.

Timing

  • Time from button press to having a signal out (on m-pod and USB ports): less than 500μs.
  • Time from scanner trigger input to having a signal out: less than 10 μs.
  • Typical USB driver delay when controller is in Keyboard mode: up to 12 milliseconds.
  • USB driver delay depends on the used USB driver and software. When used with SuperLab 6, our C++ and Python libraries, the delay is 2ms with 0ms jitter. Otherwise, it is 5 to 6 milliseconds.
  • Light sensor latency: less than 10 μs. This is the latency of the Lumina controller only; see below for the light sensor’s response time.

To get around delays inherent in USB drivers, the controller can send time-stamped information in both Keyboard and USB Serial modes. The timer can be reset via a light sensor or an external TTL signal. In USB Serial mode, the timer can also be reset via a command sent over USB.

Trigger Input

The controller provides two methods for accepting triggers from fMRI scanners:

  • Fiber optic, suitable for Siemens scanners. 
  • Electrical, suitable for GE and Phillips scanners. This input accepts both TTL and differential voltage signals. The connector sources current from 5V through a 1k resistor so the driver needs to sink 5mA.

Minimum pulse duration is 7μs and minimum gap between pulses is 400µs.

A version of the Lumina controller is available that offers optical isolation. This  guarantees that no unwanted electricity flows between the controller and your MRI scanner. When optically isolated, the input needs nominal 5mA and a minimum of 1mA. The input has a 100 Ohm resistor to limit the current to about 30mA if the source is not current limited. 

m-pod Connector

The controller is compatible with Cedrus’ range of m-pod devices. This allows the controller to send event markers to a recording device of your choice, e.g. EEG or eye tracker. The following signals can be marked:

  • Onset of key presses
  • Onset of scanner trigger
  • Onset of light sensor
  • Event markers sent via USB

Firmware

XID, or eXperimental Interface Device, is technology first used by Cedrus in 2001 on Lumina’s first generation controller and later adopted on all Cedrus hardware products. The current 3G Lumina controller’s firmware implements the XID 2.0 platform. The firmware is upgradeable.

Power Requirements

The Lumina controller ships with a medically rated, UL-60601 certified AC adapter. It accepts 100-240VAC, 50-60Hz input, and produces regulated 9VDC, 2.0A max. CE certified. 

Response Pads

The response pads are made from 100% plastic and fiber optics. 

  • The switches measure 18 x 18mm (0.70 x 0.70 in.) on all models.
  • The RH and LH models measure 172 x 124mm.
  • The 3B, THUMB, LINE, an DIAM models measure 110 x 82mm.

Here are the dimensions for the more popular PAIR model:


Copper Outpost

The optional Copper Outpost allows the Lumina controller to recognize two Lumina response pad sets instead of just one, allowing for a maximum of eight buttons.

The Copper Outpost can sit on a desk or be wall mounted. Its power is provided by the controller; no separate AC adapter is needed.

Cedrus Light Sensor

The light sensor is available in two colors: black and white. Notches are molded in on three sides to allow for easy positioning on the screen. The controller can be configured so that detection of light can reset the built-in timer.

  • Response time (dark to light):  0.05 milliseconds
  • Release time (light to dark):  4 milliseconds
  • Spectral sensitivity:  360-970 nm (visible light)

The response and release times are dependent on the amount of light.

The light sensor is small, measuring only 8mm (W) by 20mm (L) including the wire’s strain relief.

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