Overt verbal responses in the scanner
We used a cued recall task,which is commonly applied in judgement
of learning studies, instead of a recognition memory task that is more
common in fMRI studies, because the former avoids the confounding
of fully endogenous retrieval and familiarity and therefore provides a
more straightforward operationalization of the cognitive retrieval process
assumed to underlie metacognitive monitoring of learning. To
avoid differences in response modality in the two tasks, participants
were requested to vocalize the probability of recalling the word in the
monitoring task as well. The verbal responses during scanning were recorded
for off-line analysis with a fibre optic microphone (FOM 1190
OPTIMIC™) using the GoldWave v5.05 software. The resulting audio
files (4410 Hz sampling, 38 dB, 16 bit stereo) were processed in mono
format with the Scanner Noise Cancellation Tool (Cusack et al., 2005).
The cleaned audiofiles were subsequently used for evaluating the responses
and establishing response reaction times.
Fig. 1.