scholarly journals Delayed suppression normalizes face identity responses in the primate brain

2019 ◽  
Author(s):  
Kenji W. Koyano ◽  
Adam P. Jones ◽  
David B. T. McMahon ◽  
Elena N. Waidmann ◽  
Brian E. Russ ◽  
...  

SummaryThe primate brain is specialized for social visual perception. Previous work indicates that recognition draws upon an internal comparison between a viewed face and an internally stored average face. Here we demonstrate that this comparison takes the form of a delayed, dynamic suppression of face averageness among single neurons. In three macaque face patches, spiking responses to low-identity morphed faces met with a synchronous attenuation starting approximately 200 ms after onset. Analysis showed that a late-emerging V-shaped identity tuning was sometimes superimposed on linear ramp tuning. This pattern could not be ascribed to repetition suppression within a given session. The results indicate that the brain’s analysis of faces is enhanced through predictive normalization of identity, which increases sensitivity among face-selective neurons to distinctive facial features known to drive recognition.

2021 ◽  
Vol 13 (9) ◽  
pp. 4984
Author(s):  
Rocio Poveda-Bautista ◽  
Jose-Antonio Diego-Mas ◽  
Jorge Alcaide-Marzal

Based on the appearance of their faces, we attribute to people personality traits, moods, capacities, or competences. This unconscious process plays a central role in our everyday decisions and how we choose partners or our favorite candidate. This work is the first approach to the analysis of the influence of appearance-driven judgments of faces in the project management field. The main objective of this study was to obtain an approximate image of the general mental prototype of the face of a project manager using noise-based reverse correlation. The obtained image shows the features of the faces that drive the perception of a good project manager. The face shows very high average scores for all the competences recognized in the IPMA Individual Competence Baseline when assessed by a sample of project management practitioners. From these results, it can be stated that people have clearly defined prototypes of facial features that convey the perception of being a competent project manager, and this finding may have implications in the project management field.


2019 ◽  
Author(s):  
Lucas Pereira Carlini ◽  
Tatiany M. Heideirich ◽  
Rita C. X. Balda ◽  
Marina C. M. Barros ◽  
Ruth Guinsburg ◽  
...  

More than 500 painful intervetions are carried out during the hospitalization of a newborn baby in an intensive medical care unit. In these situations, there is, however, a challenging difficulty to identify pain, owing to the unlikeliness of direct and objective verbal communication commonly used among adults. This work is part of an on-going research that aims to develop a computational framework to interpreting and recognizing patterns on face images for automatic assessment of neonatal procedural pain. We believe that such investigation might provide relevant information to understand the relation between neonatal facial features and procedural pain and, consequently, helping health professionals in the corresponding clinical practice.


2014 ◽  
Vol 8 (1) ◽  
pp. 8-14 ◽  
Author(s):  
Chen Yue ◽  
Ekstrom Tor ◽  
Maher Stephen ◽  
Norton Daniel

Author(s):  
Marina Carvalho de Moraes Barros ◽  
Carlos Eduardo Thomaz ◽  
Giselle Valério Teixeira da Silva ◽  
Juliana do Carmo Azevedo Soares ◽  
Lucas Pereira Carlini ◽  
...  

2018 ◽  
Author(s):  
Daniel Feuerriegel ◽  
Hannah A. D. Keage ◽  
Bruno Rossion ◽  
Genevieve L. Quek

AbstractOddball designs are widely used to investigate the sensitivity of the visual system to statistical regularities in sensory environments. However, the underlying mechanisms that give rise to visual mismatch responses remain unknown. Much research has focused on identifying separable, additive effects of stimulus repetition and stimulus appearance probability (expectation/surprise) but findings from non-oddball designs indicate that these effects also interact. We adapted the fast periodic visual stimulation (FPVS) unfamiliar face identity oddball design (Liu-Shuang et al., 2014) to test for both additive and interactive effects of stimulus repetition and stimulus expectation. In two experiments, a given face identity was presented at a 6 Hz periodic rate; a different identity face (the oddball) appeared as every 7th image in the sequence (i.e., at 0.857 Hz). Electroencephalographic (EEG) activity was recorded during these stimulation sequences. In Experiment 1, we tested for surprise responses evoked by unexpected face image repetitions by replacing 10% of the commonly-presented oddball faces with exact repetitions of the base rate face identity image. In Experiment 2, immediately repeated or unrepeated face identity oddballs were presented in high and low presentation probability contexts (i.e., expected or surprising), allowing assessment of expectation effects on responses to both repeated and unrepeated stimuli. Across both experiments objective (i.e., frequency-locked) visual mismatch responses driven by stimulus expectation were only found for oddball faces of a different identity to base rate faces (i.e., unrepeated identity oddballs). Our results show that immediate stimulus repetition (i.e., repetition suppression) can reduce or abolish expectation effects as indexed by EEG responses in visual oddball designs.Highlights-We studied visual mismatch responses with a fast periodic oddball design-Our design cleanly separates immediate stimulus repetition and expectation effects-Stimulus expectation effects were only present for unrepeated stimuli-Immediate stimulus repetition reduced EEG expectation effects


Author(s):  
Marta Macchi ◽  
Livia Nicoletta Rossi ◽  
Ivan Cortinovis ◽  
Lucia Menegazzo ◽  
Sandra Maria Burri ◽  
...  

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