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Fusiform face area

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https://www.readbyqxmd.com/read/28814631/face-percept-formation-in-human-ventral-temporal-cortex
#1
Kai J Miller, Dora Hermes, Franco Pestilli, Gagan S Wig, Jeffrey G Ojemann
Loci in ventral temporal cortex are selectively active while viewing faces and other objects, but it remains unclear whether these areas represent accumulation of simple visual information, or processing of intact percept. We measured broadband electrocorticographic changes from implanted electrodes on the ventral temporal brain surface while showing patients noise-degraded images of faces and houses. In a subset of posterior fusiform gyrus face-selective regions, cortical activity decreased parametrically with noise increase, until the perceptual threshold...
August 16, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28746335/adjudicating-between-face-coding-models-with-individual-face-fmri-responses
#2
Johan D Carlin, Nikolaus Kriegeskorte
The perceptual representation of individual faces is often explained with reference to a norm-based face space. In such spaces, individuals are encoded as vectors where identity is primarily conveyed by direction and distinctiveness by eccentricity. Here we measured human fMRI responses and psychophysical similarity judgments of individual face exemplars, which were generated as realistic 3D animations using a computer-graphics model. We developed and evaluated multiple neurobiologically plausible computational models, each of which predicts a representational distance matrix and a regional-mean activation profile for 24 face stimuli...
July 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28669909/plastic-reorganization-of-neural-systems-for-perception-of-others-in-the-congenitally-blind
#3
S L Fairhall, K B Porter, C Bellucci, M Mazzetti, C Cipolli, M I Gobbini
Recent evidence suggests that the function of the core system for face perception might extend beyond visual face-perception to a broader role in person perception. To critically test the broader role of core face-system in person perception, we examined the role of the core system during the perception of others in 7 congenitally blind individuals and 15 sighted subjects by measuring their neural responses using fMRI while they listened to voices and performed identity and emotion recognition tasks. We hypothesised that in people who have had no visual experience of faces, core face-system areas may assume a role in the perception of others via voices...
June 30, 2017: NeuroImage
https://www.readbyqxmd.com/read/28649194/seeing-double-exploring-the-phenomenology-of-self-reported-absence-of-rivalry-in-bistable-pictures
#4
Elisa Filevich, Maxi Becker, Yuan-Hao Wu, Simone Kühn
Ambiguous images such as Rubin's vase-face can be interpreted in at least two different ways. These interpretations are typically taken to be mutually exclusive, and ambiguous images have thus served as models of perceptual competition. Here, we present data that challenges this view. In an online survey, we found that a large proportion of people within the general population reported that the two percepts were not competing but could be perceived simultaneously. Of those who reported that they could see both percepts simultaneously, we invited 17 participants to take part in a functional magnetic resonance imaging (fMRI) experiment...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28647484/neural-representation-of-geometry-and-surface-properties-in-object-and-scene-perception
#5
Matthew X Lowe, Jason Rajsic, Jason P Gallivan, Susanne Ferber, Jonathan S Cant
Multiple cortical regions are crucial for perceiving the visual world, yet the processes shaping representations in these regions are unclear. To address this issue, we must elucidate how perceptual features shape representations of the environment. Here, we explore how the weighting of different visual features affects neural representations of objects and scenes, focusing on the scene-selective parahippocampal place area (PPA), but additionally including the retrosplenial complex (RSC), occipital place area (OPA), lateral occipital (LO) area, fusiform face area (FFA) and occipital face area (OFA)...
June 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28619654/representational-precision-in-visual-cortex-reveals-outcome-encoding-and-reward-modulation-during-action-preparation
#6
Henk van Steenbergen, Christopher M Warren, Simone Kühn, Sanne de Wit, Reinout W Wiers, Bernhard Hommel
According to ideomotor theory, goal-directed action involves the active perceptual anticipation of actions and their associated effects. We used multivariate analysis of fMRI data to test if preparation of an action promotes precision in the perceptual representation of the action. In addition, we tested how reward magnitude modulates this effect. Finally, we examined how expectation and uncertainty impact neural precision in the motor cortex. In line with our predictions, preparation of a hand or face action increased the precision of neural activation patterns in the extrastriate body area (EBA) and fusiform face area (FFA), respectively...
June 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28588478/lower-activation-in-frontal-cortex-and-posterior-cingulate-cortex-observed-during-sex-determination-test-in-early-stage-dementia-of-the-alzheimer-type
#7
Ravi Rajmohan, Ronald C Anderson, Dan Fang, Austin G Meyer, Pavis Laengvejkal, Parunyou Julayanont, Greg Hannabas, Kitten Linton, John Culberson, Hafiz Khan, John De Toledo, P Hemachandra Reddy, Michael W O'Boyle
Face-labeling refers to the ability to classify faces into social categories. This plays a critical role in human interaction as it serves to define concepts of socially acceptable interpersonal behavior. The purpose of the current study was to characterize, what, if any, impairments in face-labeling are detectable in participants with early-stage clinically diagnosed dementia of the Alzheimer type (CDDAT) through the use of the sex determination test (SDT). In the current study, four (1 female, 3 males) CDDAT and nine (4 females, 5 males) age-matched neurotypicals (NT) completed the SDT using chimeric faces while undergoing BOLD fMRI...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28552781/dissociated-neural-basis-of-two-behavioral-hallmarks-of-holistic-face-processing-the-whole-part-effect-and-composite-face-effect
#8
Jin Li, Lijie Huang, Yiying Song, Jia Liu
It has been long proposed that our extraordinary face recognition ability stems from holistic face processing. Two widely-used behavioral hallmarks of holistic face processing are the whole-part effect (WPE) and composite-face effect (CFE). However, it remains unknown whether these two effects reflect similar or different aspects of holistic face processing. Here we investigated this question by examining whether the WPE and CFE involved shared or distinct neural substrates in a large sample of participants (N=200)...
May 25, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28506872/unreliability-of-putative-fmri-biomarkers-during-emotional-face-processing
#9
C L Nord, A Gray, C J Charpentier, O J Robinson, J P Roiser
There is considerable need to develop tailored approaches to psychiatric treatment. Numerous researchers have proposed using functional magnetic resonance imaging (fMRI) biomarkers to predict therapeutic response, in particular by measuring task-evoked subgenual anterior cingulate (sgACC) and amygdala activation in mood and anxiety disorders. Translating this to the clinic relies on the assumption that blood-oxygen-level dependent (BOLD) responses in these regions are stable within individuals. To test this assumption, we scanned a group of 29 volunteers twice (mean test-retest interval=14...
May 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28472436/the-role-of-experience-in-the-face-selective-response-in-right-ffa
#10
Rankin W McGugin, Katie F Ryan, Benjamin J Tamber-Rosenau, Isabel Gauthier
The expertise hypothesis suggests the fusiform face area (FFA) is more responsive to faces than to other categories because of experience individuating faces. Accordingly, individual differences in FFA's selectivity for faces should relate to differences in behavioral face-recognition ability. However, previous studies have not demonstrated this, while the comparable association is often observed with nonface objects. We created a training paradigm with conditions sufficient to observe the same effect with faces...
May 3, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28451634/position-information-encoded-by-population-activity-in-hierarchical-visual-areas
#11
Kei Majima, Paul Sukhanov, Tomoyasu Horikawa, Yukiyasu Kamitani
Neurons in high-level visual areas respond to more complex visual features with broader receptive fields (RFs) compared to those in low-level visual areas. Thus, high-level visual areas are generally considered to carry less information regarding the position of seen objects in the visual field. However, larger RFs may not imply loss of position information at the population level. Here, we evaluated how accurately the position of a seen object could be predicted (decoded) from activity patterns in each of six representative visual areas with different RF sizes [V1-V4, lateral occipital complex (LOC), and fusiform face area (FFA)]...
March 2017: ENeuro
https://www.readbyqxmd.com/read/28424398/-brodmann-areas-27-28-36-and-37-the-parahippocampal-and-the-fusiform-gyri
#12
Satoshi Eifuku
First, Brodmann areas 27, 28, 36 and 37, were anatomically defined in the beginning of this review. These areas exist in the parahippocampal or fusiform gyrus of the ventral temporal lobe in humans. Subsequently, the current understanding of their functions was summarized on the basis of recent findings mainly through human functional neuroimaging studies and animal studies. Rodent studies have shown the existence of neuronal activities for representing space, such as those involving head-direction cells or grid cells, in areas 27 (the parasubicular cortex) and 28 (the ventral entorhinal cortex)...
April 2017: Brain and Nerve, Shinkei Kenkyū No Shinpo
https://www.readbyqxmd.com/read/28412511/difference-in-neural-response-to-social-exclusion-observation-and-subsequent-altruism-between-adolescents-and-adults
#13
Béatrice Tousignant, Fanny Eugène, Katia Sirois, Philip L Jackson
Empathy and prosocial behaviors toward peers promote successful social development and creation of significant long-term relationships, but surprisingly little is known about the maturation of these skills during the period of adolescence. As the majority of studies have used questionnaires or pain observation paradigms, it remains unknown whether the empathic response of adolescents differs from that of adults in a paradigm that is closer to everyday life. In the current study, fMRI was used to examine the neural correlates of social exclusion observation and subsequent prosocial behavior in 20 adolescents (aged 12-17 years) and 20 adults (aged 22-30 years) while playing a ball-tossing game with what they believed to be real individuals...
April 12, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28391034/the-structural-and-functional-correlates-of-the-efficiency-in-fearful-face-detection
#14
Yongchao Wang, Nana Guo, Li Zhao, Hui Huang, Xiaonan Yao, Na Sang, Xin Hou, Yu Mao, Taiyong Bi, Jiang Qiu
Human visual system is found to be much efficient in searching for a fearful face. Some individuals are more sensitive to this threat-related stimulus. However, we still know little about the neural correlates of such variability. In the current study, we exploited a visual search paradigm, and asked the subjects to search for a fearful face or a target gender. Every subject showed a shallower search function for fearful face search than face gender search, indicating a stable fearful face advantage. We then used voxel-based morphometry (VBM) analysis and correlated this advantage to the gray matter volume (GMV) of some presumably face related cortical areas...
April 5, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28345189/tuning-face-perception-with-electrical-stimulation-of-the-fusiform-gyrus
#15
Corey J Keller, Ido Davidesco, Pierre Megevand, Fred A Lado, Rafael Malach, Ashesh D Mehta
The fusiform gyrus (FG) is an important node in the face processing network, but knowledge of its causal role in face perception is currently limited. Recent work demonstrated that high frequency stimulation applied to the FG distorts the perception of faces in human subjects (Parvizi et al. []: J Neurosci 32:14915-14920). However, the timing of this process in the FG relative to stimulus onset and the spatial extent of FG's role in face perception are unknown. Here, we investigate the causal role of the FG in face perception by applying precise, event-related electrical stimulation (ES) to higher order visual areas including the FG in six human subjects undergoing intracranial monitoring for epilepsy...
June 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28290075/audio-visual-speech-perception-in-adult-readers-with-dyslexia-an-fmri-study
#16
Jascha Rüsseler, Zheng Ye, Ivonne Gerth, Gregor R Szycik, Thomas F Münte
Developmental dyslexia is a specific deficit in reading and spelling that often persists into adulthood. In the present study, we used slow event-related fMRI and independent component analysis to identify brain networks involved in perception of audio-visual speech in a group of adult readers with dyslexia (RD) and a group of fluent readers (FR). Participants saw a video of a female speaker saying a disyllabic word. In the congruent condition, audio and video input were identical whereas in the incongruent condition, the two inputs differed...
March 13, 2017: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/28279012/unsuppressible-repetition-suppression-and-exemplar-specific-expectation-suppression-in-the-fusiform-face-area
#17
Auréliane Pajani, Sid Kouider, Paul Roux, Vincent de Gardelle
Recent work casts Repetition Suppression (RS), i.e. the reduced neural response to repeated stimuli, as the consequence of reduced surprise for repeated inputs. This research, along with other studies documenting Expectation Suppression, i.e. reduced responses to expected stimuli, emphasizes the role of expectations and predictive codes in perception. Here, we use fMRI to further characterize the nature of predictive signals in the human brain. Prior to scanning, participants were implicitly exposed to associations within face pairs...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28263416/the-effect-of-reward-expectation-on-the-time-course-of-perceptual-decisions
#18
Annalisa Tosoni, Giorgia Committeri, Cinzia Calluso, Gaspare Galati
Perceptual discriminations can be strongly biased by the expected reward for a correct decision but the neural mechanisms underlying this influence are still partially unclear. Using functional magnetic resonance imaging (fMRI) during a task requiring to arbitrarily associate a visual stimulus with a specific action, we have recently shown that perceptual decisions are encoded within the same sensory-motor regions responsible for planning and executing specific motor actions. Here we examined whether these regions additionally encode the amount of expected reward for a perceptual decision...
March 6, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28215697/directed-network-discovery-with-dynamic-network-modelling
#19
Stefano Anzellotti, Dorit Kliemann, Nir Jacoby, Rebecca Saxe
Cognitive tasks recruit multiple brain regions. Understanding how these regions influence each other (the network structure) is an important step to characterize the neural basis of cognitive processes. Often, limited evidence is available to restrict the range of hypotheses a priori, and techniques that sift efficiently through a large number of possible network structures are needed (network discovery). This article introduces a novel modelling technique for network discovery (Dynamic Network Modelling or DNM) that builds on ideas from Granger Causality and Dynamic Causal Modelling introducing three key changes: (1) efficient network discovery is implemented with statistical tests on the consistency of model parameters across participants, (2) the tests take into account the magnitude and sign of each influence, and (3) variance explained in independent data is used as an absolute (rather than relative) measure of the quality of the network model...
May 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28193532/age-dependent-atypicalities-in-body-and-face-sensitive-activation-of-the-eba-and-ffa-in-individuals-with-asd
#20
Yuko Okamoto, Hirotaka Kosaka, Ryo Kitada, Ayumi Seki, Hiroki C Tanabe, Masamichi J Hayashi, Takanori Kochiyama, Daisuke N Saito, Hisakazu T Yanaka, Toshio Munesue, Makoto Ishitobi, Masao Omori, Yuji Wada, Hidehiko Okazawa, Tatsuya Koeda, Norihiro Sadato
Individuals with autism spectrum disorder (ASD) have difficuly in recognizing bodies and faces, which are more pronounced in children than adults. If such difficulties originate from dysfunction of the extrastriate body area (EBA) and the fusiform face area (FFA), activation in these regions might be more atypical in children than in adults. We preformed functional magnetic resonance imaging while children and adults with ASD and age-matched typically developed (TD) individuals observed face, body, car, and scene...
February 11, 2017: Neuroscience Research
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