LR10 Lab Rat Interface Module
The Lab Rat HAL is the nexus for all interactions with the Lab Rat interface module. The Lab Rat is only available in Synapse Lite software. The LR10 HAL is an independent object in the Processing Tree. However, the acquisition processing and I/O functionality are internally dependent on Corpus software and emulated RZ2 hardware.
|LR10 Block Diagram, showing the analog amplifier enabled|
Controls for analog and digital amplifiers, synthetic neural data generation for experiment testing, and multi I/O communications are modified within the Lab Rat object. Here, subcomponents can be enabled or disabled, and their settings can be adjusted prior to experimental run time. The four tabs of the LR10 are: Analog Amp, Digital Headstage, Fake Brain, and Other I/O.
The Analog Amp page controls the 16-channel analog neural input on the Lab Rat interface module. From this page, the user can: enable/disable the amplifier, control how many channels of input to read, and adjust the sampling rate and filter settings of the amplifier. When the amplifier is enabled, the amplifier ID will appear as a Gizmo output at the top of the HAL and can be connected to other gizmos for further signal processing, with your selected channel count and amp ID.
|LR10 Analog Amp Options|
Enable the Digital Headstage when using an Intan-based digital headstage.
|LR10 Digital Headstage Options|
'Auto' low pass filter settings for different sub amp sampling rates
The Fake Brain is a synthetic data generator. This is a useful tool for designing experiments with well-behaved signals. The Fake Brain acts like an amplifier, and streams generated signals from the Lab Rat into Corpus. This means that you can connect Gizmo inputs to the Fake Brain output. Please take care to double-check that you are not handling and saving synthetic data during real experiments.
|LR10 Fake Brain Options|
See the FB128 section of the System 3 Manual for more information on the Fake Brain modes.
Other I/O Tab
|LR10 Other I/O Tab|
Lab Rat digital and analog I/O are passed to the emulated RZ2 processor in Corpus. This allows common support of these inputs and outputs across TDT system configurations. Software configuration of the multi I/O parameters is controlled in the RZ HAL. The Jump to... section takes users to the appropriate RZ HAL page for I/O configuration. For more information, please overview See RZ Options..
|LR10 Runtime Interface|
When Digital I/O Monitor is enabled on the Other I/O Tab, the state of all 16 bits is shown on the runtime interface in binary format.
If Show Value is selected for the ADCs option on the Other I/O Tab, the current voltage on the ADC inputs will be shown at runtime.
If Run-Time Control Mode is enabled in the Fake Brain Tab, you can change the fake signal type dynamically.
If the Imp Check option is enabled for the analog and/or digital headstage, use the interface button to switch the LR10 into impedance checking mode. The current impedance values of the connected electrode will update on the user interface. During the impedance check, the signals returned from the amplifier will be the value of the impedance, in MOhm. If the impedance of an electrode is above 500 kOhm, the monitor will return a value of "High Imp."
The impedance check uses a sine wave signal. The frequency depends on the sampling rate of the sub-amplifier.
| Analog Amp
Sampling Rate | Impedance Check
Frequency | | 750 Hz | 35 Hz | | 1.5 kHz | 70 Hz | | 3 kHz | 140 Hz | | 6 kHz | 280 Hz | | 12 kHz | 560 Hz | | 25 kHz | 1120 Hz | |! Digital Amp
Sampling Rate | Impedance Check
Frequency | |------------------------------:|---------------:| | 750 Hz | 24 Hz | | 1.5 kHz | 48 Hz | | 3 kHz | 95 Hz | | 6 kHz | 191 Hz | | 12 kHz | 381 Hz | | 25 kHz | 763 Hz |
The pinouts are looking into the connector.
DB26 Neural Input - Shared Reference Mode
DB26 Neural Input - Differential Mode
There are 8 (+) channels and 8 (-) channels per DB26 connector.
Consult tech note 0896 before attempting to make any custom connections. Use the PZ5 instructions.