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INFORMATION ABOUT THIS DATA

Data Set Name Preflight Rat 2 raw data
Data Set Description Neural spike data, timing and rat position data from Rat 2 during ground-based versions of Escher Staircase and Magic Carpet.

Each data set is identified by the day of recording (FD4, FD9, or Preflight) and by the Rat number. For example, “FD4Rat1” contains the data set for the Flight Day 4 recording of Rat 1.

Each data set is organized into a variable number of directories (TT0, TT1, etc.) Each directory contains the data recorded from one of the recording “tetrodes” in the rat's brain. The tetrode is a 4-channel electrode that records the activity of a small cluster of neurons. Each channel is labeled x, y, a, or b.

There are multiple files within each TT directory. Each file contains the data from one of the cells recorded from that electrode. The number of cells recorded on each electrode varied from 1 to > 10.

There are three types of sessions. (1) Data from the animal's run on the Escher Staircase (ES) track, (2) data from the animal's run on the Magic Carpet (MC) track, and (3) data from a baseline (BL) session in which the animal rested quietly in the Rodent Sleeping Pouch. There may be repetitions of each one of these session types.

File naming convention: These files are named with the Session type and the neuron number. For example, “ES.cell1” contains the data from Neuron #1 during the Escher Staircase experiment and “BL2.cell5” contains the data from Neuron #5 during the second baseline session.

File format: The first 14 lines contain a header that contains certain information. The only important line is that starting with the word “Fields.” This line contains the column headings for each of the 15 columns of data. Each field is identified below.

After the header, each line of the file contains the raw data corresponding to every spike produced by the neuron during the session. Thus, if the neuron fired 100 spikes during the session, there will be 100 lines of data following the header.

The type of data recorded (the fields listed in the header) are as follows:
id: The identifier for the spike
t_px: the peak of the spike recorded on channel x
t_py: the peak of the spike recorded on channel y
t_pa: the peak of the spike recorded on channel a
t_pb: the peak of the spike recorded on channel b
t_mx: the integrated area under the spike waveform recorded on channel x
t_my: the integrated area under the spike waveform recorded on channel y
t_ma: the integrated area under the spike waveform recorded on channel a
t_mb: the integrated area under the spike waveform recorded on channel b
t_maxwd: the width of the spike
t_maxht: the height of the spike on the largest channel
time: the time of occurence of the spike (in units of tens of microseconds)
pos_x: the x-coordinate of the rat's position when the spike fired
pos_y: the y-coordinate of the rat's position when the spike fired
Level of Processing Raw - Microsoft Excel Spreadsheet
Data Files [Available online]
Measurements
Neural spike data, rat position data
Data Collection Site(s) Investigator laboratory
Data Source Experiment
Measurement or Analysis Technique
Experiments
Missions
+ STS-90
Responsible NASA Official The NASA representative responsible for providing this information is:
Ames Research Center LSDA Level 3
Project Manager: Helen Stewart