title: Positively valenced stimuli facilitate creative novel metaphoric processes by enhancing medial prefrontal cortical activation.
abstract: A metaphor is a figure of speech in which a subject is symbolic of another unrelated object. In the present study, we examined neural patterns associated with both novel unfamiliar and conventional familiar metaphoric processing, and how these patterns are modulated by affective valence. Prior to fMRI scanning, participants received a list of word pairs (novel unfamiliar metaphors as well as conventional familiar metaphors) and were asked to denote the valence (positive, negative, or neutral) of each word pair. During scanning, participants had to decide whether the word pairs formed meaningful or meaningless expressions. Results indicate that participants were faster and more accurate at deciding that positively valenced metaphors were meaningful compared to neutral metaphors. These behavioral findings were accompanied by increased activation in the medial prefrontal cortex (mPFC), posterior cingulate cortex (PCC), and the right inferior parietal lobe (RIPL). Specifically, positively valenced novel unfamiliar metaphors elicited activation in these brain regions in addition to the left superior temporal gyrus when compared to neutral novel metaphors. We also found that the mPFC and PCC mediated the processing of positively valenced metaphors when compared to negatively valenced metaphors. Positively valenced conventional metaphors, however, elicited different neural signatures when contrasted with either neutral or negatively valenced conventional metaphors. Together, our results indicate that positively valenced stimuli facilitate creative metaphoric processes (specifically novel metaphoric processes) by mediating attention and cognitive control processes required for the access, integration, and selection of semantic associations via modulation of the mPFC. The present study is important for the development of neural accounts of emotion-cognition interactions required for creativity, language, and successful social functioning in general.
authors: Department of Psychiatry, University of California San Francisco San Francisco, CA, USA.
authors: Karuna
authors: K
authors: Subramaniam
authors: Mark
authors: M
authors: Beeman
authors: Miriam
authors: M
authors: Faust
authors: Nira
authors: N
authors: Mashal
keywords: affective valence; conventional metaphors; creativity; fMRI; medial prefrontal cortex; novel metaphors
references: Brain Lang. 2008 Oct;107(1):1-10
references: 17897706
references: J Cogn Neurosci. 2009 Mar;21(3):415-32
references: 18578603
references: Neuropsychologia. 2005;43(14):2084-100
references: 16243053
references: Trends Cogn Sci. 2003 Feb;7(2):92-96
references: 12584028
references: Brain Lang. 2007 Feb;100(2):115-26
references: 16290261
references: Brain. 1965 Sep;88(3):585-644
references: 5318824
references: Mem Cognit. 1980 Mar;8(2):149-56
references: 7382816
references: Psychol Sci. 2002 Jan;13(1):34-40
references: 11892776
references: J Pers Soc Psychol. 1991 Sep;61(3):380-91
references: 1941510
references: Brain Lang. 2007 Feb;100(2):111-4
references: 16956657
references: Brain Res Bull. 2011 Oct 10;86(3-4):203-16
references: 21803125
references: Trends Neurosci. 2003 Aug;26(8):429-35
references: 12900174
references: Neuron. 2003 Apr 24;38(2):339-46
references: 12718866
references: Neuropsychologia. 2012 Oct;50(12):2705-2719
references: 22867993
references: Trends Cogn Sci. 2005 Nov;9(11):512-8
references: 16214387
references: Neuroimage. 2003 Mar;18(3):633-41
references: 12667840
references: J Cogn Neurosci. 2008 Jan;20(1):170-81
references: 17919080
references: Laterality. 2009 Nov;14(6):573-89
references: 19253086
references: J Pers Soc Psychol. 1988 Nov;55(5):811-8
references: 3210148
references: Proc Natl Acad Sci U S A. 1992 Jul 1;89(13):5951-5
references: 1631079
references: Cereb Cortex. 2009 Dec;19(12):2767-96
references: 19329570
references: J Exp Psychol Learn Mem Cogn. 2004 Mar;30(2):343-353
references: 14979809
references: J Neurosci. 2000 Aug 15;20(16):6159-65
references: 10934265
references: Emotion. 2003 Dec;3(4):327-43
references: 14674827
references: Neuropsychologia. 2007 Mar 2;45(4):860-70
references: 17010392
references: Psychol Rev. 1999 Jul;106(3):529-50
references: 10467897
references: Trends Cogn Sci. 2000 Jun;4(6):215-222
references: 10827444
references: Trends Cogn Sci. 2004 Dec;8(12):539-46
references: 15556023
references: Emotion. 2004 Dec;4(4):354-63
references: 15571434
references: J Pers Soc Psychol. 1987 Jun;52(6):1122-31
references: 3598858
references: Proc Natl Acad Sci U S A. 2007 Jan 2;104(1):383-8
references: 17182749
references: Neurosci Lett. 2001 Jun 15;305(3):149-52
references: 11403927
references: Brain Lang. 1984 Jul;22(2):253-65
references: 6204711
references: Hum Brain Mapp. 2012 Mar;33(3):676-94
references: 21520342
references: Science. 2004 Feb 13;303(5660):1023-6
references: 14963333
references: J Neurophysiol. 2006 Jan;95(1):301-10
references: 16192329