The double-duty lexical decision task required subjects to respond to visually presented real, standard words (SW) with their right index finger and to imperative words (animals, AN) with the left index finger, while withholding them to all non-words. The non-words were of two types: pseudowords (PW) that were orthographically and phonologically legal letter strings with no meaning, such as “poman,” and non-pronounceable non-words (NW), comprised of consonants such as “dscrt.” Participants were instructed to respond as quickly as possible, without losing accuracy. Two different stimulus lists were created and were administered in a counterbalanced manner across beverage conditions and subjects. 110 stimuli for each condition were randomly presented with the Presentation software package (Neurobehavioral Systems) in white letters on the black background for 300 ms preceded and followed by a fixation string (xxxx) with a total trial length of 2.5 s. Short breaks were given every ∼4 min. All stimuli categories were matched for the word length on average, AN: 6.2 ± 1.7 letters; SW: 6.3 ± 1.6; PW: 6.2 ± 1.7; NW: 6.0 ± 1.3. The number of syllables
