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. Author manuscript; available in PMC: 2018 May 1.
Published in final edited form as: Neurobiol Aging. 2017 Feb 7;53:122–137. doi: 10.1016/j.neurobiolaging.2017.01.023

Table 2.

Odor pairs used in discrimination problems

Experiment Chemical class Odorants Carbon chain difference
1 Aliphatic alcohols C3 versus C8/1-propanol versus 1-octanol Δ5
C6 versus C9/1-hexanol versus 1-nonanol Δ3
C4 versus C5/1-butanol versus 1-pentanol Δ1
2 (cohort A) Aliphatic alcohols C3 versus C8/1-propanol versus 1-octanol Δ5
C6 versus C9/1-hexanol versus 1-nonanol Δ3
C4 versus C5/1-butanol versus 1-pentanol Δ1
2 (cohort B) Aliphatic alcohols C3 versus C8/1-propanol versus 1-octanol Δ5
C6 versus C9/1-hexanol versus 1-nonanol Δ3
C4 versus C5/1-butanol versus 1-pentanol Δ1
Aliphatic aldehydes C4 versus C9/1-butanal versus 1-nonanal Δ5
C8 versus C11/1-octanal versus 1-undecanal Δ3
C5 versus C6/1-pentanal versus 1-hexanal Δ1
Aliphatic carboxylic acids C3 versus C8/propanoic versus octanoic Δ5
C6 versus C9/hexanoic versus nonanoic Δ3
C4 versus C5/butanoic versus pentanoic Δ1
Structurally unrelated Citral versus 2-heptanone n/a
Methyl salicylate versus guaiacol n/a
2-octanone versus benzaldehyde n/a