Update 'README.md'

README.md

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 Single unit data isolated from linear multielectrode arrays while recording in awake fixating monkeys and gratings drifted on the screen
 
+
     Here are important definitions of the variables stored in each file:
     Onsets: stimulus onset times from photodiode
     offsets: stimulus offset times from photodiode
@@ -31,3 +32,16 @@ Single unit data isolated from linear multielectrode arrays while recording in a
     clust: cluster label from kilosort
     norm_autocorr: discretized data
     chan: channel label
+    
+    Methods: 
+    All procedures complied with the regulations by the Association for the Assessment and Accreditation of Laboratory     Animal Care (AAALAC), Vanderbilt University’s Institutional Animal Care and Use Committee (IACUC) and National     Institutes of Health (NIH) guidelines.
+    
+  
+    
+    Paradigm:
+    For each session, data were collected while animals performed visual tasks that rewarded passive fixation while drifting sine-wave gratings of varying contrast were presented to one or both eyes. The gratings had a spatial frequency of 1 cyc/deg and drifted at a temporal frequency of 4 Hz while the animal fixated within a 1-2 deg radius around the fixation cue (0.5 deg) at the center of the screen. Within each recording epoch, gratings maintained a constant orientation with orientation tilts in the range of -45°, 0°, 45°, 60°, 90°, 135°, 180°, and grating size varied from 2° to 8° . The interstimulus interval varied between a median duration of 1.3 s and 2.1 s across sessions, with an overall median duration of 1.7 s. The stimulus appeared from 250 to 500 ms after the fixation cross appeared on the screen. If the monkey fixated on the cross throughout the whole duration of a trial, it received a juice reward. 
+    
+    Single units were isolated using Kilosort (1).
+    
+    References:
+    1. Pachitariu M, Steinmetz N, Kadir S, Carandini M, and Harris KD. Kilosort: realtime spike-sorting for extracellular electrophysiology with hundreds of channels. bioRxiv 061481, 2016, 10.1101/061481.)