Figure 2.

Special cases arising from participant responses that match on multiple dimensions (indicated in bold). C: color response; F: form response; N: number response. Top panel: The multidimensional response shifts the detection of a rule change, and thus the start of a new sequence, by one trial. Middle panel: The multidimensional response is scored as an efficient error, because the participant subsequently switches to the correct rule. Bottom panel: The multidimensional response shifts the opportunity to determine the new sorting rule by one trial, resulting in an efficient error later in the sequence.