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Signal averaging to obtain ERPs is necessary becausea) sensory, motor and cognitive processes generate small signals compared to the raw EEGb) sensory, motor and cognitive processes generate large signals compared to the raw EEGc) we do not know the time course of the neural events and underlying sensory, motor or cognitive functionsd) the raw EEG alone is not informative about brain processesI think the answer is a but I’m not completely sure.Signal averaging to obtain an event related potential (ERP) requires that you know ___a) the neurochemical processes involvedb) where in the brain the signal is coming fromc) when the event of interest took placed) which neurons are generating the signal