• Chi-Cheng Yang, Kit-Man Yuen, Sheng-Jean Huang, Sheng-Huang Hsiao, Yi-Hsin Tsai, and Wei-Chi Lin.
• a Division of Clinical Psychology, Master of Behavioral Sciences, College of Medicine , Chang-Gung University , Taoyuan , Taiwan.
• J Clin Exp Neuropsychol. 2014 Jan 1;36(4):399-409.

Primary ObjectivePostconcussion symptoms (PCS) are common following mild traumatic brain injury (mTBI). A psychological misperception, the "good-old-days" bias, has been indicated as one of the influencing factors on symptom reporting after injury. To date, this response bias has only been examined in a small number of cross-sectional studies. This study thus prospectively evaluated the "good-old-days" bias in patients with mTBI.Research DesignA prospective follow-up study.Method And ProceduresFifty-three patients with mTBI were recruited in this study. The PCS was evaluated by the modified Checklist of Postconcussion Symptoms (mCPCS) at 1 month post injury. Twenty-five patients were evaluated again at 3 months after injuries. In addition, 53 healthy participants were also evaluated for the PCS, and 23 of them underwent a second evaluation at 2 months after the first one.Main Outcomes And ResultsPatients with mTBI showed significantly higher PCS reporting at 1 month post injury than healthy participants did, but not at 3 months post injury. Consistent with the "good-old-days" bias, patients remarkably underestimated their preinjury PCS at 1 month post injury. Interestingly, our results further revealed that this response bias diminished more at 3 months than at 1 month after mTBI.ConclusionsThis study thus might be the first one to prospectively reveal the progression of the "good-old-days" bias in patients with mTBI.

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