For one who is interested in computational neuroscience and brain computer interface, in university curriculum (e.g. BCCN Berlin), it requires a course in statistical signal processing / signal detection theory.
In order to study these, is it strongly necessary to firstly read signals and systems (e.g. Oppenheim Signals and Systems, and, Discrete-Time Digital Signal Processing, in total 2000 pages though..), or it is just ok to directly start with
e.g. Kay, Fundamentals of Statistical Signal Processing
since in some university course pages, it seems the prerequisite does not include signals and systems.