A central claim of embodied theories of cognition is that sensory representations are
routinely activated and influence language processing even in the absence of relevant
sensory input (cf. Pulvermüller, 2005; Wassenburg & Zwaan, 2010). We tested the influence
of color representations during language processing in three visual world eye tracking
experiments. The method is particularly well suited to investigate this issue because the
availability of relevant visual input can be manipulated.
We made use of the phenomena that when participants hear a word that refers to a
visual object or printed word they quickly direct their eye gaze to objects or printed words
which are similar (e.g. semantically or visually) to the heard word. We used a look and listen
task which previously has been shown to be sensitive to such relationships between spoken
words and visual items. In Experiment 1, on experimental trials, participants listened to
sentences containing a critical target word associated with a prototypical color (e.g.
'...spinach...') as they inspected a visual display with four words printed in black font. One of
the four printed words was associated with the same prototypical color (e.g. green) as the
spoken target word (e.g. FROG). On experimental trials, the spoken target word did not have
a printed word counterpart (SPINACH was not present in the display). In filler trials (70% of
trials) the target was present in the display and attracted significantly more overt attention
than the unrelated distractors. In experimental trials color competitors were not looked at
more than the distractors. In Experiment 2 the printed words were replaced with line
drawings of the objects. In order to direct the attentional focus of our participants toward
color features we used a within-participants counter-balanced design and alternated color
and greyscale trials randomly throughout the experiment. Therefore, on one trial our
participants heard a word such as 'spinach' and saw a frog (colored in green) in the visual
display. On the next trial however they saw a banana (in greyscale) on hearing 'canary'
(bananas and canaries are typically yellow), etc. The presence (or absence) of color was
thus a salient property of the experiment. Participants looked more at color competitors than
unrelated distractors on hearing the target word in the color trials but not in the greyscale
trials, i.e. on hearing 'spinach' they looked at the green frog but not the greyscale frog.
Experiment 3 was identical to Experiment 2, except that the visual display was removed at
the sentence onset, after a longer preview. This experiment examined whether the continued
presence of color in the immediate visual environment was necessary for the observation of
color-mediated eye movements. Eye movements directed towards the now blank screen
were recorded as the sentence unfolded (cf. Spivey & Geng, 2001). In the filler trials,
participants looked significantly more at the locations where the targets, rather than the
distractors, had been previously presented as the target words acoustically unfolded. In the
experimental trials, the locations where the color competitors had previously been presented
did not attract increased attention (neither in color nor greyscale trials).
These data demonstrate that language-mediated eye movements are only influenced
by color relations between spoken words and visually displayed items if color is present in the immediate visual environment. We conclude that color representations are unlikely to be
routinely activated in language processing. Our findings provide strong constraints for
embodied theories of cognition which assume that sensory representations influence language processing even in the absence of relevant sensory input. These results fit best with the notion that the main role of sensory representations in language processing is a different one, namely to contextualize language in the immediate environment, connecting language to the here and now.