Figure 1.

Performance loss of invasive neural recording electrodes as quantified by various methods, including (A) amplitude of largest recorded units on silicon microelectrode arrays (Utah arrays; reproduced with permission from [19], Copyright 2011); (B) yield and interface impedance of tungsten microwire arrays (reproduced with permission from [20], Copyright 2012); (C) signal-to-noise ratio (SNR) of units recorded on silicon laminar probes (Michigan arrays, reproduced with permission from [21], Copyright 2004), and (D) number of viable channels defined as electrodes on silicon microelectrode arrays (Utah arrays) capable of recording action potentials (reproduced with permission from [22], Copyright 2013).