Update 'README.md'

README.md

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 # SSVEP_Lrrk2
 
-Steady-state VEP data recorded in female Lrrk2-KO (n=15) or WT rats (n=14). Electrodes were screws located bilaterally over the visual cortex and stranded electrodes located in the layer 4 of the superior colliculus,recording local field potentials. The recordings were made in Spike 2, the data provided here has been exported to the .mat format which can be loaded into matlab.
+Steady-state VEP data recorded in female Lrrk2-KO (n=15) or WT rats (n=14). Electrodes were screws located bilaterally over the visual cortex and stranded electrodes located in the layer 4 of the superior colliculus, recording local field potentials through a tether. The animals were awake and behaving during the recording. The recordings were made in Spike2 v.7.20, the data provided here has been exported to the .mat format which can be loaded into matlab.
 
 (data is used for the paper: Knocking out the LRRK2 gene increases sensitivity to wavelength information in the rat, Østergaard)
 
@@ -9,6 +9,9 @@ Steady-state VEP data recorded in female Lrrk2-KO (n=15) or WT rats (n=14). Elec
 
 ## Structure of repository
 There three folders in the this repository two for data: Colour test and PFE360. The third: Matlab scripts contains a sample script for preprocessing preproc_frequency_spectra_pfe.m and a function accuplot_mini.m
+In general each data file contains the recordings from four animals: channels 1-4 -> first animal channels 5-8 -> second animal etc.
+ch1 = visual cortex right side, ch2 = superior colliculus right side, ch3 = superior colliculus left side, ch4 = visual cortex left side
+It is sampled at 1000 Hz with a high-pass filter at 1 Hz and a low-pass filter at 200 Hz.  
 
 - The colour test: five different wavelengths were applied to a 10 ms flash of light presented at a rate of 14 Hz. The wavelengths were: short-wave blue (SWB) here denoted UV (405 nm), blue (455-460 nm), green (525-530 nm), red (620-625 nm) and white 5050 SMD LEDs.