The dataset is divided in two categories: rat and non-human primate (nhp). Each *.mat file represents a single subject. Data structures are identically organized for each subject and feature the following fields. **Structure fields.** - emgs: 1 x e cell array of strings. Muscle names for each implanted EMG. - emgsabr: 1 x e cell array of strings. Abbreviated muscle names for each implanted EMG. - nChan: a single scalar equal to c. Number of cortical array channels. - stimProfile: 1 x t single. Represents the current trace applied, synchronized to EMG data and sampled at sampFreqEMG. - stim_channel: j x 1 values. Which channel was stimulated at each individual stimulus. - evoked_emg: 1 x e cell array. Each entry is a numerical matrix associated to a single EMG. Each entry is j x t and represents the rectified voltage recorded from the muscle during a stimulation event. The trace is synchronized to stimProfile. - response: 1 x e cell array. Each entry is a numerical matrix associated to a single EMG. Each entry is j x 1 and represents a sampled cumulative response (during peak activity) for each evoked_emg. Thus, each trace is collapsed to a single outcome value. - isvalid : 1 x e cell array. Each entry is a numerical matrix associated to a single EMG. Each entry is j x 1 and determines whether the recorded response can be considered valid. A value of 1 means that we found no reason to exclude the response. A value of 0 means that baseline (pre-stimulus) activity exceeds accepted levels and indicates that spontaneous EMG activity was ongoing at the time of stimulus delivery. A value of -1 indicates that the response is an outlier, yet baseline activity is within range. We consider the "0" and "-1" categories practically possible and impossible to reject during online trials, respectively. - sorted_evoked : c x e cell array. Corresponds to "evoked_emg", where each EMG response has been sorted and assigned to the source stimulation site. - sorted_resp : c x e cell array. Corresponds to "response", where each EMG response has been sorted and assigned to the source stimulation site. - sorted_isvalid : c x e cell array. Corresponds to "isvalid", where each EMG response has been sorted and assigned to the source stimulation site. - sorted_respMean : c x e single array. Average of all valid responses, segregated per stimulating channel and per EMG. - sorted_respSD : c x e single array. Standard deviation of all valid responses, segregated per stimulating channel and per EMG. - sampFreqEMG : Sampling frequency of EMG voltage traces. - resp_region : within t samples, the area considered as peak EMG activity when collapsing outcome values from evoked_emg to response. - map : geometrical channel localization map in a 2-dimensional space. - ch2xy : c x 2 matrix with <x,y> relative coordinates for each stimulation channel. Units are intra-electrode spacing. **Legend.** c : number of channels in the implanted cortical array (variable between species) e : implanted EMG count (variable between subjects) j : individual stimuli count throughout the session. t : number of recorded samples for each stimulus. Sampling frequency is sampFreqEMG (variable between species).