Chronos Adapter for BrainAmp [42940]

This article applies to:

E-Prime 3.0

Chronos

Detail

Experiment Author: Psychology Software Tools, Inc.

The Chronos Adapter for BrainAmp sample experiment illustrates how to use Task Events to send markers from the E-Prime experiment to the BrainAmp amplifier.

Abstract

The sample experiment presents a Visual Oddball Task: each trial presents the letter "O" or "X" and the participant's task is to distinguish between these letters. 80% of the trials present the letter "O" and 20% of the trials present the letter "X". The experiment sends the marker value 1 when the letter "O" is shown and the value 32768 when the letter "X" is shown.

The Chronos Adapter for BrainAmp provides access to 16 digital outputs (from Chronos to the BrainAmp amplifier) as shown below:

This sample experiment illustrates the digital output functionality. When Chronos sends a marker on its first digital output, the BioAmp amplifier receives it on Trigger In 1 (pin 14). When Chronos sends a marker on its sixteenth digital output, the BioAmp amplifier receives it on Trigger 2 In 16 (pin 9). To determine which BrainAmp receiver digital input receives a trigger value sent from Chronos, do the following:

1. Represent the integer marker being sent as a binary number (see INFO: Choosing a marker value to send from E-Prime to an external device [42529] for more information on integer and binary numbers).
2. Map the binary number to Chronos's digital outputs to determine which outputs are set high (set to 1).
3. Examine which BrainAmp amplifier digital inputs map to the Chronos digital outputs that are set high.

For example, the sample sends the integer value 1 when the stimulus = the letter "O":

1. Integer value 1 equals the binary number 0000 0001 (Least Significant Bit is the right-most bit).
2. 0000 0001 sets the first Chronos digital output high; all other digital outputs are low.
3. As shown in the table above, the first Chronos Digital Outputs maps to BioAmp receiver Trigger In 1.

The sample sends the integer value 32768 when the stimulus = the letter "X":

1. Integer value 32768 equals the binary number 1000 0000 0000 0000.
2. 1000 0000 0000 0000 sets the sixteenth Chronos digital output high; all other digital outputs are low.
3. The sixteenth Chronos Digital Output maps to BioAmp amplifier Trigger2 In 16.

NOTE: The sample experiment attached to this article and the information above assume that the Digital Port Settings in the BrainVision Recorder software are set to the same Type, e.g. they are all set to "Stimulus", and use Active High Logic. Using a combination of Type values and/or using Active Low logic impacts the marker values that are received and displayed in Recorder. If you have questions about how to configure the Digital Port Settings in Brain Products' software or how these settings impact the marker values received, then please contact Brain Products technical support at https://www.brainproducts.com/support-resources/#contact-support.

NOTE: Extract all the files in the attached .zip file to the same folder. The sample experiment displays images that must be located in the same folder as the experiment.

See Also:

E-Prime Extensions for Brain Products  - simplifies the experiment development, integration, and participant experience when integrating with Brain Product's EEG systems

Chronos Custom Adapters for other Brain Products amplifiers:

• Chronos Adapter for Brain Products actiCHamp [42199]
• Chronos Adapter for TriggerBox [43178]