Reference

Several techniques are used to study activity in the olfactory bulb (OB), as identified from the search results:

1. Electrobulbogram (EBG) Technique: A non-invasive method for recording functional signals in the human OB 1.
2. Optical Imaging Techniques: These visualize experience-induced changes in glomerular odor representations 3.
3. Evoked Potential and Unit Activity Recording: Used to study the effects of vagus nerve stimulation on the OB 4.
4. Optogenetics Combined with Single-Cell Recordings: Used to selectively activate sensory input channels within the OB 6.
5. Functional Magnetic Resonance Imaging (fMRI): Both T2-prepared BOLD fMRI and contrast-enhanced cerebral blood volume-weighted (CBVw) fMRI are used to assess neural activity in the OB 10, 13.
6. Dual-Color 2-Photon Ca2+ Imaging and Extracellular Probes: Used to record neuronal activity from populations of neurons in different parts of the OB 14.

These techniques provide a comprehensive approach to studying the complex activity within the olfactory bulb, contributing to our understanding of olfactory processing and related neurological functions.