Maximum Depth

Maximum depth refers to how deep into the brain a probe can be implanted, determined by the probe's total length. This is distinct from recording span - a probe might extend 10mm deep but only have recording sites across the final 3mm.

Why it matters: Maximum depth determines which brain structures you can access. Deep brain recordings (hippocampus, thalamus, basal ganglia) require longer probes than cortical surface recordings.

Depth considerations:

• Shallow (0-2 mm): Cortical surface, superficial layers
• Medium (2-5 mm): Full cortical depth, rodent hippocampus
• Deep (5-10 mm): Deep brain structures, primate recordings
• Ultra-deep (10+ mm): Large animal deep brain structures

Practical factors: Longer probes are more rigid (to prevent buckling) and require more careful surgical technique. Consider the mechanical strength needed to reach your target without the probe bending or breaking.