We wish to report the following error. In [1] on page 844, we omitted key plus and minus signs in the Methods section. The section should read as follows: ‘Reward expectancy regressors, coupled to the anticipation period, reflected the expected value (EV) of the arrow, being set to +0.5 for the up arrow condition (given the 50% chance of winning $1) and −0.25 for the down arrow condition (given the 50% chance of losing 50 cents). Prediction error regressors, coupled to the outcome, were determined by the difference between the outcome and the EV, i.e., +0.5 for a win following an up arrow, −0.5 for no win following an up arrow, +0.25 for a no loss following a down arrow, and −0.25 for a loss following a down arrow’.

We apologize for this error, and thank Jay Fournier for bringing it to our attention.


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  2. Reference
  • 1
    Chase HW, Nusslock R, Almeida JRC, Forbes EE, LaBarbara EJ, Phillips ML. Dissociable patterns of abnormal frontal cortical activation during anticipation of an uncertain reward or loss in bipolar versus major depression. Bipolar Disord 2013; 15: 839854.