Search

Background: Human parental care relies heavily on the ability to monitor and respond to a child's affective states. The current study examined pupil diameter as a potential physiological index of mothers' affective response to infant facial expressions. Methods: Pupillary time-series were measured from 86 mothers of young infants in response to an array of photographic infant faces falling into four emotive categories based on valence (positive vs. negative) and arousal (mild vs. strong). Results: Pupil dilation was highly sensitive to the valence of facial expressions, being larger for negative vs. positive facial expressions. A separate control experiment with luminance-matched non-face stimuli indicated that the valence effect was specific to facial expressions and cannot be explained by luminance confounds. Pupil response was not sensitive to the arousal level of facial expressions. Conclusions: The results show the feasibility of using pupil diameter as a marker of mothers' affective responses to ecologically valid infant stimuli and point to a particularly prompt maternal response to infant distress cues. [ABSTRACT FROM AUTHOR]

Considerable advances have been made in understanding how emotional information is coded in the brain and used in the service of adaptive behavior, yet the developmental origins of these processes remain relatively unexamined. In this article, we review recent studies in human infants and experimental animals that have highlighted the importance of the first years of life in the development of emotion-processing capacities, particularly the ability to respond preferentially to threat-alerting stimuli. We discuss mechanisms that might govern the development of these capacities and suggest directions for further research into the nature and functional significance of infants’ early-emerging biases in the perception of emotional information. [ABSTRACT FROM PUBLISHER]

Background: Allelic variation in the promoter region of a gene that encodes tryptophan hydroxylase isoform 2 (TPH2), a rate-limiting enzyme of serotonin synthesis in the central nervous system, has been associated with variations in cognitive function and vulnerability to affective spectrum disorders. Little is known about the effects of this gene variant on cognition during development and about possible intermediate developmental steps that lead to the adult phenotype. Here, we examined the hypothesis that the TPH2 -703 may act during early stages of development and bias the acquisition of elementary cognitive processes involved in attention and emotion regulation. Methods: Seven-month-old infants ( n = 66) were genotyped for the TPH2 -703 G/T polymorphism ( rs4570625) and tested for the efficiency of attention shifts from a stimulus at fixation to a new stimulus in the visual periphery. Results: Compared to TPH2 G/G homozygotes, infants with the T-carrier genotype exhibited a significantly higher number of missing attention shifts. This genotype effect tended to be particularly pronounced when infants had to disengage from an affectively salient stimulus before shifting attention to the peripheral stimulus. The results also showed that TPH2 genotype was indirectly associated, via its effect on attention disengagement, with temperamental emotion regulation (soothability). Conclusions: Together, these results implicate serotonin system genes in early cognitive development and suggest variations in the early-emerging cognitive capacities as a potential developmental precursor of individual differences in emotion regulation and vulnerability to affective disorders. [ABSTRACT FROM AUTHOR]

Orienting of attention to emotionally negative stimuli is accompanied by rapid heart rate (HR) deceleration, reflecting enhanced attentional and sensory processing. We studied whether similar emotional modulation of cardiac responding is observed in infants. HR and eye movements were recorded from 7-month-old infants while they observed a fearful or happy face that was flanked after 700 ms by a peripheral distractor for 2000 ms. An attentional bias for fearful faces was indicated by less frequent and longer latency saccades toward the distractors during fearful than happy trials. HR deceleration was significantly larger during fearful than happy trials on which infants did not make a distractor-directed saccade. For trials with a distractor-directed saccade, no difference between fearful and happy faces emerged. Thus, the bias to attend preferentially to fearful faces is accompanied by a concomitant increase in the cardiac orienting response. [ABSTRACT FROM AUTHOR]

Humans in diverse cultures develop a capacity to recognize and share others’ emotional states. In this article, studies in adult and developmental populations are reviewed and synthesized to build a framework for understanding the neural bases and development of emotion recognition. It is proposed that foundations for the development of emotion recognition are provided by an experience-expectant neural circuitry that emerges early in life, biases infants to attend to biologically salient information, and is refined and specialized through experience for processing species-typical signals of emotions. It is also discussed how genetic variations and experiences during sensitive periods of development can affect the developmental process and give rise to subtle individual differences in emotion recognition. [ABSTRACT FROM PUBLISHER]

We investigated whether emotional information from facial expression and hand movement quality was integrated when identifying the expression of a compound stimulus showing a static facial expression combined with emotionally expressive dynamic manual actions. The emotions (happiness, neutrality, and anger) expressed by the face and hands were either congruent or incongruent. In Experiment 1, the participants judged whether the stimulus person was happy, neutral, or angry. Judgments were mainly based on the facial expressions, but were affected by manual expressions to some extent. In Experiment 2, the participants were instructed to base their judgment on the facial expression only. An effect of hand movement expressive quality was observed for happy facial expressions. The results conform with the proposal that perception of facial expressions of emotions can be affected by the expressive qualities of hand movements. [ABSTRACT FROM AUTHOR]

Abstract: Several event-related potential (ERP) studies have demonstrated a negative shift in ERPs for fearful relative to neutral facial expressions ∼170–300ms post-stimulus over occipital-temporal scalp. In the present study, three experiments were conducted to examine the importance of the eye region for this ERP differentiation. ERPs and behavioral discrimination responses were measured to fearful and neutral expressions when only the eye region of the expression was visible (the eyes and eyebrows or the eyes alone) and when the eye region (the eyes and eyebrows or the eyes alone) was covered by dark glasses. The results showed a negative shift in ERPs for fearful relative to neutral expressions over lateral temporal sites, starting ∼160–210ms post-stimulus. The visibility of the eye region but not the eyes per se was critical for these ERP differences to occur. There were, however, indications that information in the eyes is also coded and used in the categorization of facial expressions. [Copyright &y& Elsevier]