After all on the same day (Massed

After completing the auction, participants started cue-approach training.

They were asked to press a button on the keyboard as quickly as possible when
they heard an infrequent neutral tone (Figure 1B). The general cue-approach
training procedure is described in detail in Schonberg et al. 3. The tone appeared on average 750
ms after the food stimulus appeared on the screen and this Go signal delay
(GSD) was adjusted using a staircase procedure to ensure that the participants
would only achieve roughly 75% Go success, i.e. pressing the button after the tone
sounds, but before the food stimulus disappears from the screen a fixed one
second after the onset of a food stimulus. In all studies 12 out of a total of
48 trained items were consistently associated with a tone (Go items) during the
training phase, which spanned two consecutive days. Items were either trained all
on the same day (Massed items) or had half their training presentations on day
1 and the rest of the training presentations on day 2 (Spaced items). All items
were presented a total of 12 times each during training. The three studies presented
here differ on the days on which Massed items are trained (Table 2). These
studies were designed to test potential primacy and recency effects as well as
lag effects on choice during probe following spaced cue-approach training.

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