Lec 6- face perception

Lec 6- face perception - Lecture 6- Face Perception Notes...

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Lecture 6- Face Perception Notes from Chapter 4 of Goldstein (p121-) Neurons that respond to faces IT cells respond best to pictures of faces ( GROSS, 1992, 1994 ) Some neurons in the IT respond only to the head, they stop firing when the head is covered ( WACHSMUTH ET AL, 1994 ) ROLLS and TOVEE (1995) - neuron responds to faces but not to non-facial stimuli. The research above is based on recording single neurons in a monkey’s cortex. Recently, fMRI scans have identified an area in the human IT cortex called FUSIFORM FACE AREA (FFA) which is specialized to see faces. The results from ROLLS and TOVEE (1995) - shows that a neuron responds well to faces and poorly to other types of objects. This may be due to aggressive or passive pictures that are shown to the monkey, thus, just because a neuron is specialized to respond to faces doesn’t necessarily mean that its firing signals the presence of a specific face. Neurophysiological and neuropsychological research indicates that there is an are in the brain that is specialized to respond to faces. The neurophysiological evidence comes mainly from results as stated above that show there are neurons in the monkey’s IT cortex that respond selectively to faces. The neuropsychological evidence comes from studies of people with brain damage. These studies show that damage to the TEMPORAL LOBE can cause a condition called PROSOPAGNOSIA , in which the person recognizing the faces of familiar faces. Even very familiar faces are affected. BURTON ET AL (1991) - a person with prosopagnosia might not be able to recognize close friends, family members, or even the reflection of his or her own face in the mirror. A number of recent fMRI studies have shown that pictures of faces activate the FUSIFORM GYRUS in the temporal lobe ( CLARK ET AL, 1996 ) KANWISHER ET AL (1997) - this area is specialized to respond to human faces.
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FACE RECOGNITION Notes made from Eysenck and Keane (2000) As face recognition is the most common way of identifying people we know, the ability to recognise faces is of great significance in our everyday lives. Face recognition differs in various ways from other forms of object recognition. We no know a considerable amount about the processes involved in fare recognition. There is a theoretically interesting condition known as PROSOPAGNOSIA. Prosopagnosic patients are unable to recognise familiar faces, and this can even extend to their own faces in a mirror. However, they generally have few problems in recognising familiar objects. This inability to recognise faces occurs even though prosopagnosic patients can still recognise familiar people from their voices and names. Bruce and Young’s (1986) model of face recognition Influential models of face recognition were put forward by BRUCE & YOUNG (1986) and BURTON & BRUCE (1993). There are eight components in the Bruce and Young (1986) model: ∙ STRUCTURAL ENCODING: this produces various representations or descriptions of faces. ∙ EXPRESSION ANALYSIS: people’s emotional states can be inferred form their
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Lec 6- face perception - Lecture 6- Face Perception Notes...

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