Complex sentence: Single-cell recording, Transcranial magnetic stimulation (TMS), electrical stimulation of the cortex, and Functional magnetic resonance imaging (fMRI) are some ofing topographic maps have been further studied or refined using fMRI.
Split into simpler sentences: Single-cell recording, Transcranial magnetic stimulation (TMS), electrical stimulation of the cortex, and Functional magnetic resonance imaging (fMRI) are some of the techniques used to study maps in the brain. Many of the existing topographic maps have been further studied or refined using fMRI.