This dataset contains multi-echo fMRI data from an odor and visual similarity experiment.

Each participant underwent anatomical T1-weighted imaging and three functional runs:
1. odor run 1
2. visual run 1
3. odor run 2

Functional images were acquired as multi-echo BOLD scans with four echoes per run. Therefore, each complete subject has 12 BOLD files: 3 runs × 4 echoes.

Validator note:
The BIDS validator reports an INCONSISTENT_PARAMETERS warning because the functional data were acquired using a multi-echo BOLD sequence. Each functional run contains four echoes, represented with the echo-1, echo-2, echo-3, and echo-4 entities in the filenames. The expected EchoTime values differ across echoes, while RepetitionTime and task structure are consistent across runs.

Defacing:
All T1w anatomical images in this dataset have been defaced using AFNI's
@afni_refacer_run in -mode_deface, which replaces the face and ears with zeros.
The anatomical images were regenerated from the original DICOMs using
dcm2niix v1.0.20260416 and verified to be byte-identical to the previously
released versions before defacing was applied; only the face/ear region
differs from the original acquisition.