The speed of familiar face recognition
1
Citation
0
Reference
10
Related Paper
Citation Trend
Abstract:
Recognizing a familiar person from his/her face is a fundamental brain function. Surprisingly, to date the actual speed of categorizing a face as familiar remains largely unknown. Here we seek to clarify this question by using a Go/No-go familiarity judgment task with photographs of personally familiar (same classroom as the participant) and well-matched pictures of unfamiliar faces, which required speeded responses to individually presented face stimuli. During the recording of high-density event-related potentials (ERP, 128 channels), two groups of young adult participants were instructed either to respond when a photograph of a personally familiar face was presented (n = 11, 6 females), or when the face was unfamiliar (n = 12, 7 female). Face stimuli contained external features (hair), but external indicators of identity were carefully removed (clothes, ….). Each face stimulus appeared for 100ms, followed by a blank screen (1500-1700ms). Behaviorally, faces could be classified as familiar as early as 310-320ms (average RT, 450 ms), about 80ms faster than when unfamiliar face categorization was required. ERP differential waveforms between Go and No-go responses when detecting familiarity showed the earliest difference at occipito-temporal cortex shortly after 200 ms, starting in the right hemisphere, and 10 ms later in the left hemisphere. Differences appeared about 50 ms later for the Go-unfamiliar decision task, with no differences in lateralization of onset times. There were no clear effects of face familiarity on earlier visual event-related potentials (P1, N170). These earliest effects observed in electrophysiological recordings are compatible with the behavioral output taking place at about 100 ms later. They indicate that the human brain needs no more than 200ms following stimulus onset to recognize a familiar person based on his/her face only, a time frame that puts strong constraints on the time-course of face processing operations in the human brain.Keywords:
Stimulus (psychology)
Right hemisphere
Right hemisphere
Modalities
Modality (human–computer interaction)
Cite
Citations (0)
There are two well-known hypotheses regarding hemispheric lateralization of emotions. The Right Hemisphere Hypothesis (RHH) postulates that emotions and associated display behaviors are a dominant and lateralized function of the right hemisphere. The Valence Hypothesis (VH) posits that negative emotions and related display behaviors are modulated by the right hemisphere and positive emotions and related display behaviors are modulated by the left hemisphere. Although both the RHH and VH are supported by extensive research data, they are mutually exclusive, suggesting that there may be a missing factor in play that may provide a more accurate description of how emotions are lateralization in the brain. Evidence will be presented that provides a much broader perspective of emotions by embracing the concept that emotions can be classified into primary and social types and that hemispheric lateralization is better explained by the Emotion-type Hypothesis (ETH). The ETH posits that primary emotions and related display behaviors are modulated by the right hemisphere and social emotions and related display behaviors are modulated by the left hemisphere.
Right hemisphere
Cite
Citations (34)
Right hemisphere
Depression
Cortical Spreading Depression
Cerebral hemisphere
Expression (computer science)
Cite
Citations (0)
Cerebral lateralization of global-local processing of 70 left-handed and 70 right-handed students was compared using a computerized global-local task in a half-visual field paradigm. Analysis showed that left-handed individuals were slower than right-handed individuals in processing Globally Directed stimuli presented to the left visual field (right hemisphere). In addition, left-handed individuals showed smaller local superiority in the left hemisphere to the right-handed individuals. These findings are more consistent with Levy's prediction of spatial inferiority of left-handed individuals than Geschwind and Galaburda's or Annett's hypotheses.
Left handed
Right hemisphere
Right handed
Left and right
Cite
Citations (4)
Right hemisphere
Left and right
Cite
Citations (0)
Right hemisphere
Cite
Citations (2)
Right hemisphere
Cite
Citations (21)
Right hemisphere
Cerebral hemisphere
Cite
Citations (62)
Right hemisphere
Left and right
Cite
Citations (0)