Intan

Intan Technologies acquisition systems are commonly used for electrophysiology. The system saves data in several files, with amplifier.dat and digitalin.dat being the primary files for analog and digital data, respectively.

File Formats

amplifier.dat

The amplifier.dat file contains the analog data from the amplifier channels. - Format: 2D array of int16 values. - Organization: Time-major (all channels at t=0, then all channels at t=1, etc.). - Conversion: The values be converted to microvolts using a bit resolution of 0.196 µV/bit. - Sampling Rate: Typically 30 kHz.

digitalin.dat

The digitalin.dat file contains digital input data. - Format: Binary file with one uint16 value per sampling tick. - Content: Each bit of the uint16 value represents a high (1) or low (0) state for a specific digital input channel.

Loading Data

Data can be loaded using JSON configuration objects. Below are examples for common loading scenarios.

Loading Analog Time Series

To load amplifier.dat as an analog time series:

{
    "filepath": "amplifier.dat",
    "data_type": "analog",
    "name": "voltage",
    "format": "int16",
    "header_size": 0,
    "channel_count": 32,
    "clock": "master",
    "use_memory_mapped": true
}

Loading Digital Interval Series

To load a specific digital input (e.g., channel 0) as a series of intervals:

{
    "filepath": "digitalin.dat",
    "data_type": "digital_interval",
    "name": "pico",
    "format": "uint16",
    "channel": 0,
    "transition": "rising",
    "clock": "master",
    "header_size": 0
}

Creating a TimeFrame from Digital Input

If a digital input represents a time reference (e.g., channel 1):

{
    "filepath": "digitalin.dat",
    "data_type": "time",
    "name": "time",
    "format": "uint16",
    "channel": 1,
    "transition": "rising"
}

Creating a TimeFrame from Total Samples

To create a TimeFrame based on the total number of samples in the file:

{
    "filepath": "digitalin.dat",
    "data_type": "time",
    "name": "master",
    "format": "uint16_length"
}