In the version of this article initially published, errors occurred in the text and Fig. 2 legend. In the paragraph beginning “Advances in materials science are essential attempts…” the platinum–silicone composites should have been described as “300 µm electrode diameter, 35 nm thickness, 1.4 Ocm2 impedance, 57 µC/cm2 CICs.” In the paragraph beginning “Microand nanofabrication techniques …” the array of 360 recording sites for fast addressing should have been described as having sampling rates of ~277 Hz. In the paragraph beginning “Another area of progress …” single- or few-layer sheets of graphene should have been described as having impedances of 1.6 Ocm2 and 91 Ocm2, respectively, while structures defined by colloidal sphere lithography and traditional photolithography should have been described as having impedances of 1.63 Ocm2 and 0.14 Oµm2, respectively. In the paragraph beginning “Incorporating lenses and imaging …” the phrase “at high sampling rates (16 Hz) and fine resolution (~15 µm)” should have cited ref. 74. In the Fig. 2 legend, panel f should read “Flexible array of 360 gold electrodes (300 × 300 µm2, spaced by 500 µm) supported by a backplane of active matrix electronics on a thin (25 µm) polyimide substrate for micro-electrocorticography (10 × 9 mm2) from the auditory cortex at a density of 400 electrodes cm–2.” The references for panels g and h were swapped; they should read “g, ref. 34, Springer Nature; h, ref. 29, AAAS.” The errors have been corrected in the PDF and HTML versions of this article.
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