Abstract
The expressions we see in the faces of others engage a number of different cognitive processes. Emotional expressions elicit rapid responses, which often imitate the emotion in the observed face. These effects can even occur for faces presented in such a way that the observer is not aware of them. We are also very good at explicitly recognizing and describing the emotion being expressed. A recent study, contrasting human and humanoid robot facial expressions, suggests that people can recognize the expressions made by the robot explicitly, but may not show the automatic, implicit response. The emotional expressions presented by faces are not simply reflexive, but also have a communicative component. For example, empathic expressions of pain are not simply a reflexive response to the sight of pain in another, since they are exaggerated when the empathizer knows he or she is being observed. It seems that we want people to know that we are empathic. Of especial importance among facial expressions are ostensive gestures such as the eyebrow flash, which indicate the intention to communicate. These gestures indicate, first, that the sender is to be trusted and, second, that any following signals are of importance to the receiver.
References
Adolphs R. . 1999Social cognition and the human brain. Trends Cogn. Sci. 3, 469–479. (doi:10.1016/S1364-6613(99)01399-6). Crossref, PubMed, ISI, Google ScholarAnstis S. M., Mayhew J. W.& Morley T. . 1969The perception of where a face or television ‘portrait’ is looking. Am. J. Psychol. 82, 474–489. (doi:10.2307/1420441). Crossref, PubMed, ISI, Google ScholarBavelas J. B., Black A., Lemery C. R.& Mullett J. . 1986I show how you feel: motor mimicry as a communicative act. J. Pers. Soc. Psychol. 50, 322–329. Crossref, ISI, Google ScholarBayliss A. P., Paul M. A., Cannon P. R.& Tipper S. P. . 2006Gaze cuing and affective judgments of objects: I like what you look at. Psychon. Bull. Rev. 13, 1061–1066. Crossref, PubMed, ISI, Google ScholarBeck D. M., Rees G., Frith C. D.& Lavie N. . 2001Neural correlates of change detection and change blindness. Nat. Neurosci. 4, 645–650. (doi:10.1038/88477). Crossref, PubMed, ISI, Google ScholarBourgeois P.& Hess U. . 2008The impact of social context on mimicry. Biol. Psychol. 77, 343–352. (doi:10.1016/j.biopsycho.2007.11.008). Crossref, PubMed, ISI, Google ScholarBraddick O. J., O'Brien J. M., Wattam-Bell J., Atkinson J.& Turner R. . 2000Form and motion coherence activate independent, but not dorsal/ventral segregated, networks in the human brain. Curr. Biol. 10, 731–734. (doi:10.1016/S0960-9822(00)00540-6). Crossref, PubMed, ISI, Google ScholarCalder A. J.& Young A. W. . 2005Understanding the recognition of facial identity and facial expression. Nat. Rev. Neurosci. 6, 641–651. (doi:10.1038/nrn1724). Crossref, PubMed, ISI, Google ScholarCastiello U., Paulignan Y.& Jeannerod M. . 1991Temporal dissociation of motor responses and subjective awareness. A study in normal subjects. Brain 114((6)), 2639–2655. (doi:10.1093/brain/114.6.2639). Crossref, PubMed, ISI, Google ScholarChartrand T. L.& Bargh J. A. . 1999The chameleon effect: the perception–behavior link and social interaction. J. Pers. Soc. Psychol. 76, 893–910. Crossref, PubMed, ISI, Google ScholarDanchin E., Giraldeau L. A., Valone T. J.& Wagner R. H. . 2004Public information: from nosy neighbors to cultural evolution. Science 305, 487–491. (doi:10.1126/science.1098254). Crossref, PubMed, ISI, Google Scholarde Gelder B. . 2009Why bodies? Twelve reasons for including bodily expressions in affective neuroscience. Phil. Trans. R. Soc. B 364, 3475–3484. (doi:10.1098/rstb.2009.0190). Link, ISI, Google Scholarde Gelder B., Vroomen J., Pourtois G.& Weiskrantz L. . 1999Non-conscious recognition of affect in the absence of striate cortex. Neuroreport 10, 3759–3763. Crossref, PubMed, ISI, Google ScholarDehaene S., Naccache L., Le Clec H. G., Koechlin E., Mueller M., Dehaene-Lambertz G., Van de Moortele P. F.& Le Bihan D. . 1998Imaging unconscious semantic priming. Nature 395, 597–600. (doi:10.1038/26967). Crossref, PubMed, ISI, Google ScholarDimberg U., Thunberg M.& Elmehed K. . 2000Unconscious facial reactions to emotional facial expressions. Psychol. Sci. 11, 86–89. (doi:10.1111/1467-9280.00221). Crossref, PubMed, ISI, Google ScholarDriver J., Davis G., Ricciardelli P., Kidd P., Maxwell E.& Baron-Cohen S. . 1999Gaze perception triggers reflexive visuospatial orienting. Vis. Cogn. 6, 509–540. Crossref, ISI, Google ScholarEibl-Eibesfeldt I. . 1972Similarities and differences between cultures in expressive movements. Non-verbal communication (ed.& Hinde R. A. ), pp. 297–311. Cambridge, UK: Cambridge University Press. Google ScholarEkman P.& Friesen W. V. . 1978The facial action coding system. Palo Alto, CA: Consulting Psychologists Press. Google ScholarEllis H. D.& Lewis M. B. . 2001Capgras delusion: a window on face recognition. Trends Cogn. Sci. 5, 149–156. (doi:10.1016/S1364-6613(00)01620-X). Crossref, PubMed, ISI, Google ScholarEllis H. D.& Young A. W. . 1990Accounting for delusional misidentifications. Br. J. Psychiatry 157, 239–248. (doi:10.1192/bjp.157.2.239). Crossref, PubMed, ISI, Google ScholarEllis H. D., Young A. W., Quayle A. H.& De Pauw K. W. . 1997Reduced autonomic responses to faces in Capgras delusion. Proc. R. Soc. Lond. B 264, 1085–1092. (doi:10.1098/rspb.1997.0150). Link, ISI, Google ScholarFletcher P. C., Zafiris O., Frith C. D., Honey R. A., Corlett P. R., Zilles K.& Fink G. R. . 2005On the benefits of not trying: brain activity and connectivity reflecting the interactions of explicit and implicit sequence learning. Cereb. Cortex 15, 1002–1015. (doi:10.1093/cercor/bhh201). Crossref, PubMed, ISI, Google ScholarFrith C. D.& Frith U. . 2006The neural basis of mentalizing. Neuron 50, 531–534. (doi:10.1016/j.neuron.2006.05.001). Crossref, PubMed, ISI, Google ScholarFrith C., Perry R.& Lumer E. . 1999The neural correlates of conscious experience: an experimental framework. Trends Cogn. Sci. 3, 105–114. (doi:10.1016/S1364-6613(99)01281-4). Crossref, PubMed, ISI, Google ScholarGoodale M. A., Milner A. D., Jakobson L. S.& Carey D. P. . 1991A neurological dissociation between perceiving objects and grasping them. Nature 349, 154–156. (doi:10.1038/349154a0). Crossref, PubMed, ISI, Google ScholarJohansson P., Hall L., Sikström S.& Olsson A. . 2005Failure to detect mismatches between intention and outcome in a simple decision task. Science 310, 116–119. (doi:10.1126/science.1111709). Crossref, PubMed, ISI, Google ScholarKampe K. K., Frith C. D.& Frith U. . 2003‘Hey John’: signals conveying communicative intention toward the self activate brain regions associated with ‘mentalizing’, regardless of modality. J. Neurosci. 23, 5258–5263. Crossref, PubMed, ISI, Google ScholarKeltner D.& Buswell B. N. . 1997Embarrassment: its distinct form and appeasement functions. Psychol. Bull. 122, 250–270. (doi:10.1037/0033-2909.122.3.250). Crossref, PubMed, ISI, Google ScholarKilner J. M., Paulignan Y.& Blakemore S. J. . 2003An interference effect of observed biological movement on action. Curr. Biol. 13, 522–525. (doi:10.1016/S0960-9822(03)00165-9). Crossref, PubMed, ISI, Google ScholarKilner J. M., Marchant J. L.& Frith C. D. . 2006Modulation of the mirror system by social relevance. Soc. Cogn. Affect Neurosci. 1, 143–148. (doi:10.1093/scan/nsl017). Crossref, PubMed, ISI, Google ScholarLakin J. L.& Chartrand T. L. . 2003Using nonconscious behavioral mimicry to create affiliation and rapport. Psychol. Sci. 14, 334–339. (doi:10.1111/1467-9280.14481). Crossref, PubMed, ISI, Google ScholarLeDoux J. E. . 2000Emotion circuits in the brain. Annu. Rev. Neurosci. 23, 155–184. (doi:10.1146/annurev.neuro.23.1.155). Crossref, PubMed, ISI, Google ScholarMarcel A. J. . 1983Conscious and unconscious perception: experiments on visual masking and word recognition. Cogn. Psychol. 15, 197–237. (doi:10.1016/0010-0285(83)90009-9). Crossref, PubMed, ISI, Google ScholarMitchell J. P., Banaji M. R.& Macrae C. N. . 2005General and specific contributions of the medial prefrontal cortex to knowledge about mental states. Neuroimage 28, 757–762. (doi:10.1016/j.neuroimage.2005.03.011). Crossref, PubMed, ISI, Google ScholarMorris J. S., Frith C. D., Perrett D. I., Rowland D., Young A. W., Calder A. J.& Dolan R. J. . 1996A differential neural response in the human amygdala to fearful and happy facial expressions. Nature 383, 812–815. (doi:10.1038/383812a0). Crossref, PubMed, ISI, Google ScholarMorris J. S., Ohman A.& Dolan R. J. . 1999A subcortical pathway to the right amygdala mediating ‘unseen.’ fear. Proc. Natl Acad. Sci. USA 96, 1680–1685. (doi:10.1073/pnas.96.4.1680). Crossref, PubMed, ISI, Google ScholarOhman A.& Soares J. J. . 1998Emotional conditioning to masked stimuli: expectancies for aversive outcomes following nonrecognized fear-relevant stimuli. J. Exp. Psychol. Gen. 127, 69–82. (doi:10.1037/0096-3445.127.1.69). Crossref, PubMed, ISI, Google ScholarOviatt S., Darves C.& Coulston R. . 2004Toward adaptive conversational interfaces: modelling speech convergence with animated personas. ACM Trans. Comput. Hum. Interact. 11, 300–328. (doi:10.1145/1017494.1017498). Crossref, Google ScholarParkinson B. . 2005Do facial movements express emotions or communicate motives?Pers. Soc. Psychol. Rev. 9, 278–311. (doi:10.1207/s15327957pspr0904_1). Crossref, PubMed, ISI, Google ScholarPessoa L. . 2005To what extent are emotional visual stimuli processed without attention and awareness?Curr. Opin. Neurobiol. 15, 188–196. (doi:10.1016/j.conb.2005.03.002). Crossref, PubMed, ISI, Google ScholarPickering M. J.& Garrod S. . 2004Toward a mechanistic psychology of dialogue. Behav. Brain Sci. 27, 169–190; discussion 190–226. Crossref, PubMed, ISI, Google ScholarPisella L., Grea H., Tilikete C., Vighetto A., Desmurget M., Rode G., Boisson D.& Rossetti Y. . 2000An ‘automatic pilot’ for the hand in human posterior parietal cortex: toward reinterpreting optic ataxia. Nat. Neurosci. 3, 729–736. Crossref, PubMed, ISI, Google ScholarRensink R. A., Oregan J. K.& Clark J. J. . 1997To see or not to see: the need for attention to perceive changes in scenes. Psychol. Sci. 8, 368–373. (doi:10.1111/j.1467-9280.1997.tb00427.x). Crossref, ISI, Google ScholarSchenk T. . 2006An allocentric rather than perceptual deficit in patient D.F. Nat. Neurosci. 9, 1369–1370. (doi:10.1038/nn1784). Crossref, PubMed, ISI, Google ScholarSenju A.& Csibra G. . 2008Gaze following in human infants depends on communicative signals. Curr. Biol. 18, 668–671. (doi:10.1016/j.cub.2008.03.059). Crossref, PubMed, ISI, Google ScholarSperber D.& Wilson D. . 1995Relevance: communication and cognition, 2nd edn.Oxford, UK: Blackwell. Google ScholarSusskind J. M., Lee D. H., Cusi A., Feiman R., Grabski W.& Anderson A. K. . 2008Expressing fear enhances sensory acquisition. Nat. Neurosci. 11, 843–850. (doi:10.1038/nn.2138). Crossref, PubMed, ISI, Google ScholarTempleton J. J.& Giraldeau L.-A. . 1995Patch assessment in foraging flocks of European starlings: evidence for the use of public information. Behav. Ecol. 6, 65–72. (doi:10.1093/beheco/6.1.65). Crossref, ISI, Google ScholarTodorov A., Baron S. G.& Oosterhof N. N. . 2008Evaluating face trustworthiness: a model based approach. Soc. Cogn. Affect Neurosci. 3, 119–127. (doi:10.1093/scan/nsn009). Crossref, PubMed, ISI, Google ScholarTranel D.& Damasio A. R. . 1988Non-conscious face recognition in patients with face agnosia. Behav. Brain Res. 30, 235–249. (doi:10.1016/0166-4328(88)90166-0). Crossref, PubMed, ISI, Google ScholarVan Baaren R. B., Holland R. W., Kawakami K.& Van Knippenberg A. . 2004Mimicry and prosocial behavior. Psychol. Sci. 15, 71–74. (doi:10.1111/j.0963-7214.2004.01501012.x). Crossref, PubMed, ISI, Google ScholarVuilleumier P., Armony J. L., Driver J.& Dolan R. J. . 2003Distinct spatial frequency sensitivities for processing faces and emotional expressions. Nat. Neurosci. 6, 624–631. (doi:10.1038/nn1057). Crossref, PubMed, ISI, Google ScholarWatt R., Craven B.& Quinn S. . 2007A role for eyebrows in regulating the visibility of eye gaze direction. Q. J. Exp. Psychol. (Colchester) 60, 1169–1177. (doi:10.1080/17470210701396798). Crossref, PubMed, ISI, Google ScholarWeiskrantz L.& Warrington E. K. . 1975Blindsight: residual vision following occipital lesions in man and monkey. Brain Res. 85, 184–185. Crossref, ISI, Google ScholarWhalen P. J., 2004Human amygdala responsivity to masked fearful eye whites. Science 306, 2061. (doi:10.1126/science.1103617). Crossref, PubMed, ISI, Google ScholarWinston J. S., Strange B. A., O'Doherty J.& Dolan R. J. . 2002Automatic and intentional brain responses during evaluation of trustworthiness of faces. Nat. Neurosci. 5, 277–283. (doi:10.1038/nn816). Crossref, PubMed, ISI, Google Scholar


