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Non-invasive brain stimulation techniques,including transcranial direct current stimula-tion (TDCS) and transcranial magnetic stimulation (TMS),are safe and non-invasive techniques,which can change the local excitability of the brain. The application of these techniques in the field of psychology,espe-cially decision making,has developed rapidly. These techniques provide the researchers a new perspective to study how people make decisions and to explore the neural mechanisms behind decision-making behaviors. This paper reviews the studies of non-invasive brain stimulation techniques in the field of different decision-making behaviors (risky choice,intertemporal choice and social decision-making) and the problems existing in the current studies,and puts forward some possible solutions.
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Objective To explore whether the ability of intertemporal choice is impaired in patients with mild cognitive impairment. Methods Twenty-seven patients with mild cognitive impairment and thirty-five healthy controls were recruited in this study. All subjects completed the " delay-discounting" task and the delayed discount rate (K value) was used to evaluate the patients' decision-making ability. Results (1) The delay discount rate(median=0. 0256,P25=0. 016,P75=0. 100) in mild cognitive impairment patients was higher than that of healthy cotrols(median =0. 006,P25=0. 0025,P75=0. 016). There was significant difference in K-value between the two groups ( Z=-2. 988,P<0. 01). ( 2) Spearman correlation analysis showed that the significant negatively correlation between K-value and digital span forward test (r=-0. 389, P=0. 045) in mild cognitive impairment group. Conclusion The ability of intertemporal choices is impaired in patients with mild cognitive impairment and negatively correlated with attention function.
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An important and unresolved question is how human brain regions process information and interact with each other in intertemporal choice related to gains and losses. Using psychophysiological interaction and dynamic causal modeling analyses, we investigated the functional interactions between regions involved in the decision-making process while participants performed temporal discounting tasks in both the gains and losses domains. We found two distinct intrinsic valuation systems underlying temporal discounting in the gains and losses domains: gains were specifically evaluated in the medial regions, including the medial prefrontal and orbitofrontal cortices, and losses were evaluated in the lateral dorsolateral prefrontal cortex. In addition, immediate reward or punishment was found to modulate the functional interactions between the dorsolateral prefrontal cortex and distinct regions in both the gains and losses domains: in the gains domain, the mesolimbic regions; in the losses domain, the medial prefrontal cortex, anterior cingulate cortex, and insula. These findings suggest that intertemporal choice of gains and losses might involve distinct valuation systems, and more importantly, separate neural interactions may implement the intertemporal choices of gains and losses. These findings may provide a new biological perspective for understanding the neural mechanisms underlying intertemporal choice of gains and losses.
Subject(s)
Adult , Female , Humans , Male , Young Adult , Brain , Diagnostic Imaging , Physiology , Brain Mapping , Delay Discounting , Physiology , Magnetic Resonance Imaging , Neural Pathways , Diagnostic Imaging , Physiology , Neuropsychological Tests , Psychophysics , RewardABSTRACT
Objective To investigate the impairment of intertemporal choices in adolescents with positive and negative schizophrenic symptoms.Methods 30 adolescent schizophrenia patients with positive symptoms (positive symptoms group),30 adolescent schizophrenia patients with negative symptoms (negative symptoms group)and 30 healthy controls were selected.All the subjects were investigated with intertemporalchoice Test.Results (1) Under now conditions ((37.22±30.92)％,(19.67±16.35)％,P＜0.05)),notnow conditions ((35.74±31.69)％,(19.33± 18.07)％,P＜0.05)) and overall condition ((36.48±30.44) ％,(19.50± 13.82)％,P＜0.05)),the ratio of later-large (LL) choice in negative symptoms group were significantly higher than those in the healthy controls.Under now conditions ((37.22±30.92) ％,(20.37±22.33) ％,P＜0.05)),not-now conditions ((35.74± 31.69) ％,(22.04±22.05) ％,P＜ 0.05)) and overall condition ((36.48±30.44) ％,(21.20±21.57) ％,P＜0.05)),the ratio of LL choice in negative symptoms group were significantly higher than those in positive symptoms group.There were no differences in the ratio of LL choice between positive symptoms group and healthy controls (P＞ 0.05).(2)Pearson correlation analysis showed that the Vocabulary Fluency Test of negative symptoms group was positively correlated with LL selection ratio under now conditions (r=0.411,P=0.024).Conclusion The ability of intertemporal choices in adolescents schizophrenia patients with negative symptoms is impaired remarkably,while this kind of ability is impaired unremarkable in adolescence with negative symptoms.The ability of intertemporal choices in adolescents schizophrenic patients with negative symptoms is correlated with cognitive executive function.
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Objective To explore whether the ability of intertemporal choice is impaired in schizophrenic patients and in their unaffected siblings.Methods Twenty-five schizophrenia patients,twenty-five unaffected siblings of patients and thirty healthy controls were recruited in the study."Delay-discounting" task and a battery of cognitive neuropsychological assessment were used to examine the intertemporal decision-making.Results (1) the value of k was ((0.005±0.009 in schizophrenia,0.011±0.014 in unaffected siblings and 0.024±0.029 in healthy controls,respectively.There was significant difference in k value among these three groups (F=9.487,P＜0.001).There were significant differences in k value between patients group and healthy controls,and between unaffected siblings and healthy controls (P＜0.05).There was no significant difference between schizophrenia and their unaffected siblings (P＜0.05).(2) Pearson correlation analysis not showed any relationship between neuropsychological test and the value of k.Conclusion The ability of intertemporal choices is impaired in schizophrenia and their unaffected siblings to a great degree.
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Objective To investigate whether there are changes in the ability of intertemporal choices in migraine sufferers. Method Thirty migraine sufferers and thirty healthy controls were investigated by Delay?discount Test. Results (1)The ratio of later?large (LL) choice in migraine suffers((18.15± 17.53)%) was significantly lower than that in the healthy controls((35.37±20.70)%),and the difference was statistically significant(t=3.31, P<0.05).Under the immediate option for now selection conditions and no immediate option for not?now selection conditions,the ratio of later?large (LL) choice in migraine suffers ((18.33±21.00)% ,(17.96±18.09)%) was also significantly lower than that in the healthy controls ((35.56±21.52)%,(35.19±22.05)%),and the difference was statistically significant(t=3.31, P<0.05;t=3.14, P<0.05).(2) Pearson correlation analysis showed that the Stroop Test of migraineurs was positively correlated with LL selection ratio under now conditions (r=0.49, P=0.006) and total LL selection (r=0.42, P=0.021) . Conclusion The ability of intertemporal choices in migraine sufferers has been impaired,which is correlated with executive function.
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Objective To explore whether the ability of intertemporal choice is impaired in schizophrenic patients and in their unaffected siblings.Methods Twenty-five schizophrenia patients,twenty-five unaffected siblings of patients and thirty healthy controls were recruited in the study."Delay-discounting" task and a battery of cognitive neuropsychological assessment were used to examine the intertemporal decision-making.Results (1) the value of k was ((0.005±0.009 in schizophrenia,0.011±0.014 in unaffected siblings and 0.024±0.029 in healthy controls,respectively.There was significant difference in k value among these three groups (F=9.487,P＜0.001).There were significant differences in k value between patients group and healthy controls,and between unaffected siblings and healthy controls (P＜0.05).There was no significant difference between schizophrenia and their unaffected siblings (P＜0.05).(2) Pearson correlation analysis not showed any relationship between neuropsychological test and the value of k.Conclusion The ability of intertemporal choices is impaired in schizophrenia and their unaffected siblings to a great degree.