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. 2013 Aug 5;8(8):e70706. doi: 10.1371/journal.pone.0070706

Figure 1. Power spectra of fMRI auditory stimulus.

Figure 1

Acoustic power spectra measured from the distal tips of the left and right ear sound tubes at the 0dB interaural level difference (ILD) setting. The total sound pressure level (SPL) in each ear at 0dB ILD was 86dB. Measurements were made with an omnidirectional condenser microphone (M50, Earthworks, USA) and sampled using a recorder (FR2, Fostex, Japan). These spectra are close estimates of the sound stimuli heard by both ears. The spectral and temporal properties of the sounds heard by both ears were very similar.