Thumbtack Multielectrode Arrays have multiple recording sites in a configuration up to 32 electrode channels. They are designed to record electroencephalogram (EEG) signals from all layers of the cortex in parallel in vivo, and used in chronic applications in medium to large subjects, such as primates.
Thumbtack Multielectrode Arrays come with either a conical or sharpened tip to minimize trauma upon penetration. The recording sites are placed on the side of a symmetric epoxy cone with a choice of 4, 8, 16, 24 or 32 electrode channels with a maximum diameter of 500μm.
These Platinum/Iridium recording sites are available in 15, 20, 25 and 40μm diameter options. The smallest diameter of 15μm allows effective single-unit recording, and complemented with low impedance such probes have a better signal-to-noise ratio (SNR). Larger diameter probes are more suitable for field potential recordings.