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        從經(jīng)濟(jì)領(lǐng)域到社會(huì)領(lǐng)域:決策中的不確定性

        2024-06-18 00:00:00薛靖華朱睿達(dá)劉超
        心理科學(xué) 2024年2期

        摘 要 不確定性指?jìng)€(gè)體根據(jù)已有信息進(jìn)行預(yù)測(cè)的精確程度。文章梳理了來(lái)源于經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域的不確定性研究,發(fā)現(xiàn)不確定性普遍引發(fā)個(gè)體的消極情緒。通過(guò)剖析兩個(gè)領(lǐng)域的不確定性對(duì)心理和行為的影響路徑,發(fā)現(xiàn)經(jīng)濟(jì)決策中的不確定性首先引發(fā)注意和記憶的認(rèn)知資源變化,促進(jìn)個(gè)體采取靈活的學(xué)習(xí)策略,隨后影響對(duì)獎(jiǎng)懲的評(píng)估。社會(huì)決策中的不確定性首先影響針對(duì)他人的預(yù)測(cè)推斷,進(jìn)而影響人際互動(dòng)策略,隨后影響對(duì)互動(dòng)結(jié)果的社會(huì)學(xué)習(xí)。最后針對(duì)過(guò)往研究存在的不足,提出未來(lái)值得研究的方向。

        關(guān)鍵詞 不確定性 經(jīng)濟(jì)領(lǐng)域 社會(huì)領(lǐng)域 風(fēng)險(xiǎn)厭惡 模糊厭惡 神經(jīng)機(jī)制

        1 引言

        受到所掌握的信息和環(huán)境因素的限制,不確定性廣泛存在于各種決策之中(Griffin amp; Grote, 2020;Shou et al., 2022)。不確定性指?jìng)€(gè)體根據(jù)已有信息進(jìn)行預(yù)測(cè)的精確程度(FeldmanHall amp; Shenhav,2019),包含風(fēng)險(xiǎn)不確定與模糊不確定(Crone amp;van Duijvenvoorde, 2021; Knight, 1921)。風(fēng)險(xiǎn)不確定(risk)指已知概率的不確定性,不同結(jié)果發(fā)生的概率可以明確量化。模糊不確定(ambiguity)指?jìng)€(gè)體無(wú)法得知不同結(jié)果發(fā)生的概率,或者缺乏足夠的概率信息。模糊不確定比風(fēng)險(xiǎn)不確定具有更強(qiáng)的不可預(yù)測(cè)性,被認(rèn)為是一種更深程度的不確定(Furnhamamp; Marks, 2013)。

        面對(duì)不確定性時(shí),主觀期望效用理論(subjectiveexpected utility model)假設(shè)決策者對(duì)不同事件發(fā)生的概率會(huì)賦予主觀的判斷。個(gè)體利用主觀概率分布和效用函數(shù),計(jì)算并選擇具有最大期望效用的選項(xiàng)(Savage, 1972)。最大最小化期望效用模型(maxmin expected utility model)在此基礎(chǔ)上進(jìn)行擴(kuò)展,認(rèn)為個(gè)體存在多個(gè)可能的主觀概率分布(Gilboaamp; Schmeidler, 1989)。該模型有效地量化并區(qū)分個(gè)體的風(fēng)險(xiǎn)和模糊態(tài)度,得以反映個(gè)體尋求或規(guī)避風(fēng)險(xiǎn)和模糊的一般行為傾向(Levy et al., 2010)。

        經(jīng)濟(jì)和社會(huì)領(lǐng)域的不確定性實(shí)際是人類需要面對(duì)和解決的兩大類生存問(wèn)題。面對(duì)經(jīng)濟(jì)領(lǐng)域的不確定性,人需要學(xué)會(huì)與環(huán)境相處,了解客觀規(guī)律。面對(duì)社會(huì)領(lǐng)域的不確定性,人需要學(xué)會(huì)和同類相處,完成大規(guī)模合作。經(jīng)濟(jì)決策中的不確定性主要指與金錢收益或損失有關(guān)的概率信息(Ellsberg,1961; Monosov, 2020),考察個(gè)體在包含金錢收益和損失的不確定情境中是如何權(quán)衡得失,并做出選擇的(Blankenstein et al., 2018; Crone amp; vanDuijvenvoorde, 2021)。社會(huì)決策中的不確定性源于個(gè)體和他人之間相互作用的不確定性。具體而言,社會(huì)不確定性(social uncertainty)指?jìng)€(gè)人對(duì)于自身未來(lái)狀態(tài)和行為的不確定性取決于個(gè)體對(duì)他人狀態(tài)和行為的不確定性程度(FeldmanHall amp; Shenhav,2019; Kappes et al., 2019)。我們身處龐大的社交網(wǎng)絡(luò)中,往往需要考慮與他人相關(guān)的風(fēng)險(xiǎn),而對(duì)他人能力或價(jià)值的估計(jì)某種程度上是一種復(fù)雜的概率判斷(Knight, 1921)。“社會(huì)腦”假說(shuō)提出,當(dāng)個(gè)體發(fā)展為群體時(shí),社會(huì)環(huán)境變得愈發(fā)復(fù)雜,人們進(jìn)化出特定于社會(huì)情境的方式處理信息(Lockwoodet al., 2020),并且強(qiáng)調(diào)了社會(huì)因素對(duì)大腦發(fā)展和功能塑造的重要性(Atzil et al., 2018)。隨著經(jīng)濟(jì)領(lǐng)域到社會(huì)領(lǐng)域的不確定性研究發(fā)展,有必要探討人們面對(duì)兩類不確定性時(shí),存在哪些相同或特異的心理與神經(jīng)機(jī)制。

        本文將剖析經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域不確定性影響的異同。首先總結(jié)兩個(gè)領(lǐng)域的不確定性對(duì)情緒變化的影響共性,然后區(qū)分兩個(gè)領(lǐng)域的不確定性對(duì)個(gè)體心理和行為的影響路徑差異,并闡述相關(guān)的神經(jīng)機(jī)制。最后結(jié)合目前的研究現(xiàn)狀,提出未來(lái)可行的研究思路。

        2 經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域中不確定性的影響共性

        不論面對(duì)潛在的金錢損失或與他人互動(dòng),不確定性均會(huì)引發(fā)個(gè)體的消極情緒反應(yīng)(Chen et al.,2018; Tsang, 2020)。對(duì)不確定性的特定信念進(jìn)一步調(diào)節(jié)消極情緒的變化,當(dāng)個(gè)體相信不確定狀態(tài)不可避免時(shí)會(huì)感到焦慮,而相信不確定狀態(tài)可以避免時(shí),焦慮就會(huì)伴隨憤怒(Anderson et al., 2016)。并且,通過(guò)干預(yù)改善個(gè)體對(duì)不確定性的消極信念能有效改善其憤怒表達(dá)(Laposa amp; Fracalanza, 2019)。此外,個(gè)體普遍對(duì)不確定性感到厭惡,希望迫切減少不確定性(Golman et al., 2021; Wu et al., 2021)。Golman等人提出,對(duì)不確定性的厭惡可以由信息缺口的理論模型解釋。信息缺口(information gap)指?jìng)€(gè)體意識(shí)到存在特定的不確定性問(wèn)題。風(fēng)險(xiǎn)決策下的信息缺口源于對(duì)最終結(jié)果的不確定性,思考結(jié)果的不確定性會(huì)引發(fā)不適感。模糊決策下的信息缺口還包括了對(duì)不同結(jié)果概率的不確定性,思考缺失的概率信息令人厭惡和想要逃避(Golman et al., 2021)。

        2.1 經(jīng)濟(jì)領(lǐng)域中的不確定性與情緒變化

        面對(duì)經(jīng)濟(jì)決策中的不確定性及其潛在的負(fù)面后果, 前腦島(anteriorinsula,AI) 會(huì)參與不確定性厭惡的加工,對(duì)事情的不確定性強(qiáng)度以及負(fù)面預(yù)期進(jìn)行表征(Wu et al., 2021)。不確定性還會(huì)引發(fā)與情緒相關(guān)的生理喚醒。在概率模糊時(shí),區(qū)分潛在結(jié)果的價(jià)值變得更加困難,因此身體會(huì)產(chǎn)生放大的喚醒反應(yīng),以增強(qiáng)對(duì)潛在結(jié)果的價(jià)值表征(FeldmanHall et al., 2016)。而外側(cè)前額葉的損傷破壞了生理喚醒和賭博選擇之間的關(guān)系,這會(huì)使得個(gè)體更傾向于尋求風(fēng)險(xiǎn)和模糊(FeldmanHall et al.,2019)。

        針對(duì)風(fēng)險(xiǎn)厭惡的神經(jīng)網(wǎng)絡(luò)研究發(fā)現(xiàn),低風(fēng)險(xiǎn)厭惡的老年人表征計(jì)劃和問(wèn)題解決的腦區(qū)(如背外側(cè)前額葉)之間連接性更強(qiáng),而高風(fēng)險(xiǎn)厭惡的老年人表征獎(jiǎng)懲體驗(yàn) (如眶額葉)和傷害避免(如腦島)的腦區(qū)之間連接性更強(qiáng)(Han et al., 2012)。同樣地,關(guān)于背側(cè)前扣帶皮層(dorsal anterior cingulate cortex,dACC)調(diào)節(jié)模糊決策下適應(yīng)性行為的研究發(fā)現(xiàn),左側(cè)dACC 和右側(cè)前腦島之間更強(qiáng)的功能連接性與高模糊厭惡相關(guān),而左側(cè)dACC 和右側(cè)背外側(cè)前額葉之間更強(qiáng)的功能連通性與低模糊厭惡相關(guān)(Jung etal., 2014)。

        2.2 社會(huì)領(lǐng)域中的不確定性與情緒變化

        社會(huì)決策中的不確定性源于潛在負(fù)面的人際互動(dòng),比如被同伴欺騙或遭遇沖突同樣會(huì)引發(fā)個(gè)體的不確定性厭惡,并伴隨AI 的激活。當(dāng)互動(dòng)對(duì)象是人類時(shí),AI 的激活比當(dāng)互動(dòng)對(duì)象是計(jì)算機(jī)時(shí)更強(qiáng)(Bellucci et al., 2017)。由于AI 表征對(duì)潛在負(fù)面結(jié)果的本能警惕(Xiong et al., 2020),這意味著當(dāng)不確定性源于社會(huì)互動(dòng)對(duì)象時(shí),個(gè)體可能包含更復(fù)雜的情感因素,引發(fā)更強(qiáng)烈的負(fù)面情緒。相關(guān)實(shí)證研究也發(fā)現(xiàn),相比于隨機(jī)事件帶來(lái)的風(fēng)險(xiǎn),個(gè)體更反感與社會(huì)同伴相關(guān)的風(fēng)險(xiǎn)(Fetchenhauer amp; Dunning,2012)。并且相比于經(jīng)濟(jì)情境中的負(fù)面結(jié)果(損失金錢),社會(huì)情境中的負(fù)面結(jié)果(人際關(guān)系破壞)會(huì)引發(fā)個(gè)體更強(qiáng)的消極情緒(FeldmanHall amp;Shenhav, 2019)。

        3 經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域中不確定性的影響路徑

        不確定性普遍引發(fā)個(gè)體的消極情緒,由此產(chǎn)生減少不確定性的強(qiáng)烈動(dòng)機(jī)。這與認(rèn)知閉合理論觀點(diǎn)相符,即人們?cè)谡J(rèn)知過(guò)程中具有對(duì)確定性和封閉性的基本需求,渴望捕捉信息并形成明確的判斷(Kruglanski amp; Webster, 1996)。然而, 社會(huì)領(lǐng)域的不確定性相比經(jīng)濟(jì)領(lǐng)域具有一定的獨(dú)特性(Martinez-Saito amp; Gorina, 2022), 這表現(xiàn)在兩個(gè)方面。首先在來(lái)源上,經(jīng)濟(jì)領(lǐng)域的不確定性主要源于結(jié)果的不確定性(收益或損失)。而社會(huì)領(lǐng)域的不確定性源于社會(huì)互動(dòng)的各個(gè)環(huán)節(jié)(FeldmanHall amp;Shenhav, 2019):初始階段包括對(duì)他人的初步預(yù)測(cè)和推斷(他人是否值得信任、是否有能力)。初始評(píng)估的不確定性會(huì)影響人際互動(dòng)的不確定性(合作或欺騙),從而導(dǎo)致社會(huì)互動(dòng)結(jié)果的不確定性(獲得回報(bào)或遭遇背叛)。因而,社會(huì)不確定性來(lái)源更多、更廣泛。其次在程度上,社會(huì)情境中的不確定性的程度往往比非社會(huì)情境更高,高度不確定性被認(rèn)為是區(qū)分社會(huì)和非社會(huì)環(huán)境的一個(gè)顯著特征(Mitchell, 2009)。本文將進(jìn)一步剖析經(jīng)濟(jì)和社會(huì)兩大領(lǐng)域中,不確定性對(duì)個(gè)體心理和行為變化的影響路徑。

        3.1 經(jīng)濟(jì)領(lǐng)域不確定性的影響路徑

        3.1.1 經(jīng)濟(jì)領(lǐng)域的不確定性與注意記憶

        面對(duì)潛在的損失或收益,與注意和記憶相關(guān)的認(rèn)知資源會(huì)發(fā)生變化,為應(yīng)對(duì)不確定性提供認(rèn)知上的準(zhǔn)備。不確定性影響個(gè)體選擇時(shí)的注視過(guò)程(Stoji?et al., 2020)。一方面,不確定性使人們對(duì)新信息保持高度警惕(Randles et al., 2018)。當(dāng)面對(duì)不確定的獎(jiǎng)勵(lì)時(shí),人們會(huì)擴(kuò)大自己的注意力廣度,關(guān)注環(huán)境中更多的線索(Walker et al., 2019)。從神經(jīng)活動(dòng)的角度看,額下回后部與模糊決策加工有關(guān)(Huettelet al., 2006),并負(fù)責(zé)對(duì)任務(wù)切換中相關(guān)信息的注意(Brass amp; von Cramon, 2004)。另一方面,不確定性下的物體可能得到優(yōu)先注意,使得個(gè)體產(chǎn)生更豐富或更精細(xì)的感覺(jué)表征,并對(duì)該物體的記憶增強(qiáng)。當(dāng)獎(jiǎng)勵(lì)的變化程度高,并與某一特定物體相聯(lián)系時(shí),個(gè)體對(duì)該物體的識(shí)別記憶更準(zhǔn)確(Rouhani et al.,2018)。從底層神經(jīng)的角度看,不確定性可能會(huì)增加突觸學(xué)習(xí)和儲(chǔ)存信息的能力(Monosov, 2020)。綜上,不確定性使得個(gè)體對(duì)學(xué)習(xí)和記憶編碼的需求變得更大,使其調(diào)動(dòng)更多的認(rèn)知資源去應(yīng)對(duì)不確定性。

        3.1.2 經(jīng)濟(jì)領(lǐng)域的不確定性與學(xué)習(xí)策略

        注意相關(guān)的認(rèn)知資源導(dǎo)向不確定性更深層次的信息加工,包括采取靈活的學(xué)習(xí)機(jī)制和行為策略。在涉及獎(jiǎng)懲的經(jīng)濟(jì)決策中,風(fēng)險(xiǎn)是學(xué)習(xí)的一個(gè)主要的調(diào)節(jié)因素。當(dāng)不確定水平低并且回報(bào)是明確可得時(shí),個(gè)體將以獎(jiǎng)勵(lì)驅(qū)動(dòng)的方式行動(dòng),遵循經(jīng)典的強(qiáng)化學(xué)習(xí)機(jī)制。而在高度不確定性的情況下,個(gè)體需要學(xué)習(xí)事件的結(jié)構(gòu)以減少不確定性(Martinez-Saitoamp; Gorina, 2022)。進(jìn)一步,不確定性還會(huì)引發(fā)個(gè)體的探索和利用策略。利用(exploitation)是指?jìng)€(gè)體把注意更多放在已知的回報(bào)和確定的結(jié)果上。而探索(exploration)意味著個(gè)體更多地關(guān)注具有高度不確定性的選擇(Beesley et al., 2015)。經(jīng)濟(jì)決策的目標(biāo)往往是最大化自身回報(bào),相比社會(huì)互動(dòng)中的不確定性,個(gè)體需要對(duì)獎(jiǎng)懲的概率和收益大小進(jìn)行更為精細(xì)的信息加工,并在此基礎(chǔ)上權(quán)衡探索和利用策略的比重。相關(guān)神經(jīng)機(jī)制研究也表明,相比社會(huì)決策,右側(cè)頂內(nèi)溝更多地參與經(jīng)濟(jì)決策中(如彩票情境)不確定性的加工(Fairley et al., 2022),這個(gè)區(qū)域通常被認(rèn)為表征計(jì)算和概率加工(Huettel et al.,2006; Krain et al., 2006)。而概率和價(jià)值的執(zhí)行判斷則與背外側(cè)前額葉和后頂葉皮層有關(guān)(Huettel et al.,2005)。

        3.1.3 經(jīng)濟(jì)領(lǐng)域的不確定性與獎(jiǎng)懲評(píng)估

        獎(jiǎng)懲評(píng)估是不確定性決策中的重要過(guò)程,并且受到情境因素的調(diào)節(jié)。在老虎機(jī)游戲中(經(jīng)濟(jì)領(lǐng)域),被試相比損失更看重獎(jiǎng)勵(lì),導(dǎo)致過(guò)度投資。相反,在信任游戲中(社會(huì)領(lǐng)域),被試相比回報(bào)更看重?fù)p失(Lamba et al., 2020),這意味著對(duì)兩類決策的積極與消極反饋的評(píng)估存在不對(duì)稱性。進(jìn)一步,個(gè)體對(duì)結(jié)果的歸因方式也有差異。如果對(duì)方背叛信任或違反規(guī)范,個(gè)體傾向于認(rèn)為這是自己對(duì)他人行為的判斷出現(xiàn)錯(cuò)誤,而如果同樣的負(fù)面結(jié)果出現(xiàn)在機(jī)器上,個(gè)體傾向于認(rèn)為是運(yùn)氣不好(Trautmann et al.,2008),這意味著人們可能在不確定的經(jīng)濟(jì)決策中傾向于外部歸因,而在社會(huì)決策中傾向于內(nèi)部歸因。經(jīng)濟(jì)決策中的獎(jiǎng)賞評(píng)估與腹側(cè)紋狀體、腹內(nèi)側(cè)前額葉和眶額皮層有關(guān)(Bartra et al., 2013; Blankensteinet al., 2017; Tom et al., 2007)。并且,風(fēng)險(xiǎn)決策加工更多涉及與獎(jiǎng)賞和沖突檢測(cè)相關(guān)的區(qū)域(Wu et al.,2021),如紋狀體系統(tǒng)(Hsu et al., 2005)、前扣帶回(Poudel et al., 2020)和頂葉皮層(Bach amp; Dolan,2012; Huettel et al., 2006)。

        3.2 社會(huì)領(lǐng)域不確定性的影響路徑

        3.2.1 社會(huì)領(lǐng)域的不確定性與預(yù)測(cè)推斷

        與經(jīng)濟(jì)決策不同的是,當(dāng)不確定性源于他人時(shí),人們首先要利用過(guò)去的知識(shí)和情境線索迅速縮小對(duì)他人的預(yù)測(cè)。比如,通過(guò)評(píng)估他人的外在特征和所處的環(huán)境形成初始的印象(是否友善、是否有能力)(FeldmanHall amp; Shenhav, 2019)。在初始評(píng)估階段,不確定性促使人們形成對(duì)他人的快速、自動(dòng)的初始分類,針對(duì)他人最初的印象與隨后獲得的信息相結(jié)合,從而將其歸類到不同的社會(huì)群體中(Fiske amp;Neuberg, 1990)。不確定性認(rèn)同理論表明,對(duì)他人進(jìn)行社會(huì)分類可以有效地減少不確定性,進(jìn)而影響與他人互動(dòng)的方式(Hogg, 2021)。

        此外,人們還可以通過(guò)推斷他人的意圖和動(dòng)機(jī)來(lái)減少不確定性。他人行為背后的動(dòng)機(jī)不僅是隱藏的,并且往往是動(dòng)態(tài)變化的。研究發(fā)現(xiàn),當(dāng)助人者面臨更高程度的幫助成本不確定性時(shí),受益者推斷其助人行為背后的善意意圖會(huì)增加(Xiong et al.,2020),這一推斷過(guò)程激活了負(fù)責(zé)心理理論加工的背內(nèi)側(cè)前額葉(Cole et al., 2019)。社會(huì)情境中的不確定性和不可預(yù)測(cè)性更為突出(Martinez-Saito amp;Gorina, 2022),心理理論有助于個(gè)體更好地理解對(duì)方?jīng)Q策背后的意圖。

        3.2.2 社會(huì)領(lǐng)域的不確定性與人際互動(dòng)

        社會(huì)領(lǐng)域的不確定性進(jìn)一步影響人際互動(dòng)策略。比如,結(jié)果不確定性會(huì)減少親社會(huì)行為,而影響不確定性會(huì)增加親社會(huì)行為(Kappes et al.,2018)。對(duì)于結(jié)果不確定,人們往往低估自身的決策給他人帶來(lái)的負(fù)面結(jié)果,從而有可能表現(xiàn)得更自私(Haisley amp; Weber, 2010)。而對(duì)于影響不確定性,人們會(huì)考慮自身行為是否會(huì)對(duì)他人造成潛在的有害影響,從而謹(jǐn)慎行事。此外,人們傾向于使用認(rèn)知捷徑和啟發(fā)式的信息處理策略來(lái)應(yīng)對(duì)不確定的社會(huì)情境。比如,合作收益結(jié)果的不確定性將導(dǎo)致個(gè)體使用“社會(huì)啟發(fā)式”(socialheuristics)策略,并普遍增加了合作行為(vanden Berg et al., 2021)。

        然而,社會(huì)決策中的不確定性需要區(qū)分社會(huì)偏好和風(fēng)險(xiǎn)偏好的作用。研究發(fā)現(xiàn),社會(huì)偏好(幫助意愿)和風(fēng)險(xiǎn)偏好(承擔(dān)風(fēng)險(xiǎn)意愿)對(duì)風(fēng)險(xiǎn)助人行為的影響是獨(dú)立且可分離的。哌甲酯改變的多巴胺濃度影響了幫助決策,并通過(guò)選擇性地改變風(fēng)險(xiǎn)偏好而非社會(huì)偏好來(lái)增加風(fēng)險(xiǎn)助人行為,揭示了個(gè)體在處理風(fēng)險(xiǎn)和社會(huì)后果時(shí)的神經(jīng)生物學(xué)差異(Grosset al., 2021)。

        有趣的是,經(jīng)濟(jì)領(lǐng)域的不確定性態(tài)度會(huì)影響社會(huì)互動(dòng)下的不確定性應(yīng)對(duì)方式。個(gè)體的合作或信任的程度與其模糊態(tài)度有關(guān),而與風(fēng)險(xiǎn)態(tài)度無(wú)關(guān)。對(duì)于越包容模糊性的個(gè)體而言,他們?cè)诟叨炔淮_定性的社會(huì)互動(dòng)中會(huì)對(duì)他人有著更積極的預(yù)期,表現(xiàn)出更強(qiáng)的合作意愿和親社會(huì)行為(Vives amp;FeldmanHall, 2018)。

        3.2.3 社會(huì)領(lǐng)域的不確定性與社會(huì)學(xué)習(xí)

        為了應(yīng)對(duì)不確定性,對(duì)人際互動(dòng)結(jié)果進(jìn)行評(píng)估與學(xué)習(xí)是必不可少的,經(jīng)濟(jì)決策需要個(gè)體從涉及自身的獎(jiǎng)勵(lì)或懲罰中進(jìn)行學(xué)習(xí),而社會(huì)決策需要個(gè)體從涉及他人的社會(huì)反饋中進(jìn)行學(xué)習(xí)。獲得人際互動(dòng)的反饋后,個(gè)體可以不斷地整合新的反饋信息和已有的先驗(yàn)信息,形成對(duì)他人態(tài)度和行為更準(zhǔn)確的預(yù)期。這個(gè)過(guò)程被稱為社會(huì)學(xué)習(xí),有助于減少長(zhǎng)期社會(huì)交往中的不確定性(FeldmanHall amp;Shenhav, 2019)。研究發(fā)現(xiàn),焦慮的個(gè)體往往在不確定的社會(huì)環(huán)境中表現(xiàn)出學(xué)習(xí)困難(Aylward etal., 2019)。相比于健康組被試,焦慮組被試普遍在剝削型同伴身上投入更多金錢,對(duì)負(fù)面的社會(huì)信息學(xué)習(xí)更慢且效果更差(Lamba et al., 2020)。對(duì)不確定性的強(qiáng)烈厭惡會(huì)抑制高焦慮個(gè)體的探索行為,從而限制其從環(huán)境中獲取信息(FeldmanHallamp; Shenhav, 2019)。在社會(huì)學(xué)習(xí)過(guò)程中,紋狀體系統(tǒng)起著關(guān)鍵的作用(Martinez-Saito amp; Gorina,2022),該系統(tǒng)編碼了與自我和他人行為相關(guān)的獎(jiǎng)勵(lì)信息(Báez-Mendoza amp; Schultz, 2013),對(duì)社會(huì)獎(jiǎng)賞較為敏感。

        4 總結(jié)與展望

        本文系統(tǒng)地梳理了經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域中不確定性決策研究,闡述了不確定性對(duì)情緒變化的影響共性,即普遍引發(fā)個(gè)體的消極情緒;進(jìn)一步區(qū)分了經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域中的不確定性對(duì)心理和行為的影響路徑差異,及其背后的認(rèn)知神經(jīng)機(jī)制(圖1)。

        不確定性影響個(gè)體在經(jīng)濟(jì)決策和社會(huì)決策中采取不同的認(rèn)知策略和行動(dòng)方式,在一定程度上支持了“社會(huì)腦”假說(shuō)。Lockwood 等人提出的社會(huì)腦信息加工層次表明,從目標(biāo)到執(zhí)行過(guò)程的差異有助于理解特定行為的產(chǎn)生(Lockwood etal., 2020)。個(gè)體減少不確定性使未來(lái)的狀態(tài)和結(jié)果變得可預(yù)測(cè),但具體目標(biāo)導(dǎo)向不同。經(jīng)濟(jì)決策中,個(gè)體需要準(zhǔn)確預(yù)測(cè)獎(jiǎng)懲事件的發(fā)生,以減少潛在損失,實(shí)現(xiàn)自身收益最大化。社會(huì)決策中,個(gè)體需要準(zhǔn)確預(yù)測(cè)他人的動(dòng)機(jī)與行為,實(shí)現(xiàn)互動(dòng)雙方的社會(huì)回報(bào)最大化,繼而實(shí)現(xiàn)人際關(guān)系的價(jià)值最大化。區(qū)別于非社會(huì)領(lǐng)域,對(duì)關(guān)系的建立和維持是人處于社會(huì)群體中的重要需求(Atzil et al.,2018)。而在執(zhí)行機(jī)制上,應(yīng)對(duì)社會(huì)領(lǐng)域的不確定性需要更復(fù)雜的認(rèn)知過(guò)程,其中被認(rèn)為具有社會(huì)特異性的心理理論有助于個(gè)體理解他人的情感狀態(tài) (Adolphs, 2009),從而有效地應(yīng)對(duì)源于他人的不確定性。結(jié)合目前的研究現(xiàn)狀,未來(lái)的研究可以從以下四個(gè)方面展開:

        4.1 區(qū)分風(fēng)險(xiǎn)和模糊態(tài)度的影響

        過(guò)往不確定性研究較少嚴(yán)格區(qū)分風(fēng)險(xiǎn)態(tài)度和模糊態(tài)度。然而,個(gè)體的風(fēng)險(xiǎn)態(tài)度和模糊態(tài)度時(shí)常是獨(dú)立的,存在不同的影響因素和作用機(jī)制(Blankenstein et al., 2017; Levy et al., 2010)。一方面,兩種態(tài)度存在不同的年齡發(fā)展軌跡(Blankenstein etal., 2021)。個(gè)體一生中累積暴露的應(yīng)激源與模糊態(tài)度有關(guān)(但與風(fēng)險(xiǎn)態(tài)度無(wú)關(guān)),意味著過(guò)往應(yīng)激經(jīng)歷中與不確定情景有關(guān)的消極結(jié)果,可能會(huì)使個(gè)體對(duì)未知的潛在結(jié)果更悲觀,并表現(xiàn)為更強(qiáng)的模糊厭惡(Raio et al., 2022)。另一方面,風(fēng)險(xiǎn)決策和模糊決策加工均存在特異性神經(jīng)機(jī)制。風(fēng)險(xiǎn)決策與腹外側(cè)前額葉皮層、雙側(cè)中央前回和頂葉皮層更強(qiáng)的激活有關(guān)(Blankenstein et al., 2018)。而模糊決策與背側(cè)前額葉皮層的關(guān)系更為緊密(Krain et al., 2006;Poudel et al., 2020)。因而,未來(lái)研究者需要在更多的研究領(lǐng)域(特別是社會(huì)領(lǐng)域)中區(qū)分兩種態(tài)度的差異。

        4.2 探索不確定性的益處及相關(guān)神經(jīng)機(jī)制

        過(guò)往研究主要關(guān)注不確定性的負(fù)面影響,然而適當(dāng)?shù)卦黾硬淮_定性可以使個(gè)體的思維更靈活、更具有創(chuàng)造力(Griffin amp; Grote, 2020)?!芭硕嗬?yīng)”認(rèn)為人們具有解決不確定性的內(nèi)在欲望。當(dāng)人們面對(duì)不確定的事情時(shí)會(huì)產(chǎn)生強(qiáng)烈的好奇心,即使他們預(yù)期會(huì)有消極的后果,也會(huì)采取行動(dòng)來(lái)解決不確定性(Hsee amp; Ruan, 2016)。類似地,“動(dòng)機(jī)- 不確定性效應(yīng)”表明人們會(huì)投入更多的時(shí)間、金錢和精力來(lái)追求一個(gè)不確定的獎(jiǎng)勵(lì),而不是一個(gè)期望價(jià)值相對(duì)更高的確定的獎(jiǎng)勵(lì)。并且當(dāng)人們更關(guān)注追求獎(jiǎng)勵(lì)的過(guò)程、而不是獎(jiǎng)勵(lì)本身時(shí),不確定性會(huì)帶來(lái)積極感受(如興奮感),從而增加動(dòng)機(jī)(Shen et al., 2015)。綜上,在某些時(shí)刻,不確定性可能引發(fā)好奇等積極感受,激發(fā)探索和學(xué)習(xí)(Golman et al., 2021; Lamnina amp; Chase,2019)。未來(lái)研究可以進(jìn)一步探索不確定性的正面效應(yīng)及其神經(jīng)機(jī)制。

        4.3 借鑒經(jīng)濟(jì)領(lǐng)域的經(jīng)典范式和模型研究社會(huì)領(lǐng)域的不確定性

        社會(huì)領(lǐng)域的不確定性研究還在起步階段,缺乏成熟的實(shí)驗(yàn)范式和計(jì)算模型。一個(gè)較為可行的方法是借鑒和改編經(jīng)濟(jì)領(lǐng)域的經(jīng)典范式,將其用于研究社會(huì)領(lǐng)域的不確定性。社會(huì)互動(dòng)中,我們時(shí)常需要考慮為他人的付出和相應(yīng)的回報(bào),然而有時(shí)成本和收益是不確定的。通過(guò)設(shè)置概率信息(風(fēng)險(xiǎn)情境)和隱藏部分概率信息(模糊情境),得以進(jìn)一步考察個(gè)體在面對(duì)不確定的人際互動(dòng)中的表現(xiàn)。比如,已有研究通過(guò)操控助人行為的成本不確定性(確定的成本,已知概率的風(fēng)險(xiǎn)成本,未知概率的模糊成本)以探討助人意圖的感知(Xiong et al., 2020)。其次,將計(jì)算模型應(yīng)用于量化社會(huì)不確定性是未來(lái)研究趨勢(shì)(Kappes et al., 2019),比如借鑒貝葉斯理論框架描述個(gè)體對(duì)他人行為的預(yù)測(cè)以及信念更新(Diaconescu et al., 2014),應(yīng)用最大最小化期望效用模型量化社會(huì)不確定性中的風(fēng)險(xiǎn)態(tài)度和模糊態(tài)度的影響(Vives amp; FeldmanHall, 2018)。

        4.4 不確定性的影響在經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域的遷移與泛化

        前人研究較少直接對(duì)比經(jīng)濟(jì)領(lǐng)域和社會(huì)領(lǐng)域的不確定性,存在任務(wù)差異較大且被試群體不同的問(wèn)題。未來(lái)研究可以考慮采用同一批被試,關(guān)注兩種不確定性類型的直接對(duì)比效應(yīng)。已有研究表明,不同類型的不確定性對(duì)風(fēng)險(xiǎn)規(guī)避的影響不同,對(duì)于彩票類型的風(fēng)險(xiǎn),恐懼增加了個(gè)體的風(fēng)險(xiǎn)規(guī)避,而憤怒則降低了風(fēng)險(xiǎn)規(guī)避。而在基于雙人互動(dòng)的決策風(fēng)險(xiǎn)中,則出現(xiàn)了相反的模式(Kugler et al., 2012)。并且,個(gè)體對(duì)彩票類型的不確定態(tài)度在一定程度上可以預(yù)測(cè)其在人際互動(dòng)中的不確定態(tài)度(Vives amp; FeldmanHall, 2018)。在直接對(duì)比的新視角下,通過(guò)分離不同的認(rèn)知過(guò)程,得以考察不確定性對(duì)兩類決策的特定認(rèn)知過(guò)程的影響差異與交互作用,并關(guān)注不確定性的影響是否可以從經(jīng)濟(jì)決策遷移并泛化至社會(huì)決策中。同時(shí),通過(guò)設(shè)置相應(yīng)的非社會(huì)對(duì)照條件(Lockwoodet al., 2020),進(jìn)一步探討社會(huì)不確定性是否由專門的社會(huì)信息系統(tǒng)編碼(FeldmanHall amp; Shenhav,2019)。這有助于我們更好地理解不確定性對(duì)于“社會(huì)腦”發(fā)展的作用。

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