By Stephan Ulmer (auth.), Stephan Ulmer, Olav Jansen (eds.)
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Extra info for fMRI: Basics and Clinical Applications
This was done by counting the fraction of neurophysiological recording sites where the activity obeyed the same relations as found in the BOLD signal (noise > natural and gratings > natural). This comparison was performed separately for each LFP frequency band and MUA. For details see (Kayser et al. 2004) C. Kayser and N. K. Logothetis 25 0 3 0 0 Mua range (500-3'000 Hz) 50 100 LFP frequency band [Hz] Site by site comparison Percentage recording sites 100 Noise > Natural 50 Gratings > Natural 0 0 100 200 Physiology frequency range firing rates, contrasting the above result from visual cortex.
J Neurosci 23:3972–3980 Legatt AD, Arezzo J, Vaughan HG Jr (1980) Averaged multiple unit activity as an estimate of phasic changes in local neuronal activity: effects of volume-conducted potentials. J Neurosci Methods 2:203–217 Logothetis NK (2002) The neural basis of the blood-oxygen-leveldependent functional magnetic resonance imaging signal. Philos Trans R Soc Lond B Biol Sci 357:1003–1037 Logothetis NK, Wandell BA (2004) Interpreting the BOLD signal. Annu Rev Physiol 66:735–769 Logothetis NK, Kayser C, Oeltermann A (2007) In vivo measurement of cortical impedance spectrum in monkeys: implications for signal propagation.
However, in full agreement with the above, visual modulation was well evident at the level of field potentials recorded in auditory cortex, again demonstrating a closer correspondence of the BOLD signal with field potentials than with firing rates (Kayser et al. 2008). 6 Conclusions The hemodynamic responses characterized by functional imaging better reflect the aggregate synaptic activity and local processing that is characterized by the LFPs, rather than providing information about the typical firing rates in the same region.