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Subliminal and supraliminal processing of facial expression of emotions: brain oscillation in the left/right frontal area.

Balconi M, Ferrari C - Brain Sci (2012)

Bottom Line: The unconscious effects of an emotional stimulus have been highlighted by a vast amount of research, whereover it remains questionable whether it is possible to assign a specific function to cortical brain oscillations in the unconscious perception of facial expressions of emotions.The results showed that conscious/unconscious processing and the significance of the stimulus can modulate the alpha power.Moreover, it was found that there was an increased right frontal activity for negative emotions vs. an increased left response for positive emotion.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Cognitive Psychology, Department of Psychology, Catholic University of Milan, Largo Gemelli, 1, 20123 Milan, Italy. michela.balconi@unicatt.it.

ABSTRACT
The unconscious effects of an emotional stimulus have been highlighted by a vast amount of research, whereover it remains questionable whether it is possible to assign a specific function to cortical brain oscillations in the unconscious perception of facial expressions of emotions. Alpha band variation was monitored within the right- and left-cortical side when subjects consciously (supraliminal stimulation) or unconsciously (subliminal stimulation) processed facial patterns. Twenty subjects looked at six facial expressions of emotions (anger, fear, surprise, disgust, happiness, sadness, and neutral) under two different conditions: supraliminal (200 ms) vs. subliminal (30 ms) stimulation (140 target-mask pairs for each condition). The results showed that conscious/unconscious processing and the significance of the stimulus can modulate the alpha power. Moreover, it was found that there was an increased right frontal activity for negative emotions vs. an increased left response for positive emotion. The significance of facial expressions was adduced to elucidate cortical different responses to emotional types.

No MeSH data available.


Related in: MedlinePlus

Alpha power for supraliminal (a) and subliminal (b) condition in response to positive and negative aversive facial expressions.
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brainsci-02-00085-f001: Alpha power for supraliminal (a) and subliminal (b) condition in response to positive and negative aversive facial expressions.

Mentions: For the supraliminal condition, emotion and emotion x side significant effects were found (Table 3). Planned comparisons revealed a significant main effect of emotion with significant differences between anger and sadness (F(1,19) = 8.16, p = 0.001, η2 = 0.38), and fear and sadness (F(1,19) = 8.89, p= 0.001, η2 = 0.41), with an increased activity for anger and fear respectively. The simple effects (emotion × side) revealed a higher activity in the frontal right cortical side for anger as compared to happiness, sadness, and neutral faces; fear compared to happiness and neutral faces; surprise compared with sadness, and neutral faces (all comparisons p = 0.001). Moreover, an increased activity was found in the left frontal area for happiness compared with anger and fear (Figure 1a).


Subliminal and supraliminal processing of facial expression of emotions: brain oscillation in the left/right frontal area.

Balconi M, Ferrari C - Brain Sci (2012)

Alpha power for supraliminal (a) and subliminal (b) condition in response to positive and negative aversive facial expressions.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4061794&req=5

brainsci-02-00085-f001: Alpha power for supraliminal (a) and subliminal (b) condition in response to positive and negative aversive facial expressions.
Mentions: For the supraliminal condition, emotion and emotion x side significant effects were found (Table 3). Planned comparisons revealed a significant main effect of emotion with significant differences between anger and sadness (F(1,19) = 8.16, p = 0.001, η2 = 0.38), and fear and sadness (F(1,19) = 8.89, p= 0.001, η2 = 0.41), with an increased activity for anger and fear respectively. The simple effects (emotion × side) revealed a higher activity in the frontal right cortical side for anger as compared to happiness, sadness, and neutral faces; fear compared to happiness and neutral faces; surprise compared with sadness, and neutral faces (all comparisons p = 0.001). Moreover, an increased activity was found in the left frontal area for happiness compared with anger and fear (Figure 1a).

Bottom Line: The unconscious effects of an emotional stimulus have been highlighted by a vast amount of research, whereover it remains questionable whether it is possible to assign a specific function to cortical brain oscillations in the unconscious perception of facial expressions of emotions.The results showed that conscious/unconscious processing and the significance of the stimulus can modulate the alpha power.Moreover, it was found that there was an increased right frontal activity for negative emotions vs. an increased left response for positive emotion.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Cognitive Psychology, Department of Psychology, Catholic University of Milan, Largo Gemelli, 1, 20123 Milan, Italy. michela.balconi@unicatt.it.

ABSTRACT
The unconscious effects of an emotional stimulus have been highlighted by a vast amount of research, whereover it remains questionable whether it is possible to assign a specific function to cortical brain oscillations in the unconscious perception of facial expressions of emotions. Alpha band variation was monitored within the right- and left-cortical side when subjects consciously (supraliminal stimulation) or unconsciously (subliminal stimulation) processed facial patterns. Twenty subjects looked at six facial expressions of emotions (anger, fear, surprise, disgust, happiness, sadness, and neutral) under two different conditions: supraliminal (200 ms) vs. subliminal (30 ms) stimulation (140 target-mask pairs for each condition). The results showed that conscious/unconscious processing and the significance of the stimulus can modulate the alpha power. Moreover, it was found that there was an increased right frontal activity for negative emotions vs. an increased left response for positive emotion. The significance of facial expressions was adduced to elucidate cortical different responses to emotional types.

No MeSH data available.


Related in: MedlinePlus