Position-specific and position-invariant face aftereffects reflect the adaptation of different cortical areas

Kovács, Gyula; Cziraki, Csaba; Vidnyánszky, Zoltán; Schweinberger, Stefan R.; Greenlee, Mark W.

doi:10.1016/j.neuroimage.2008.06.042

Cited by 69 publications

(99 citation statements)

References 81 publications

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“…This is similar to the position invariance found in the face aftereffect (Leopold et al, 2001;Watson & Clifford, 2003) or in adaptation effects to other biological motion stimuli (Jackson & Blake, 2010). The position-invariant face aftereffect primarily involves the fusiform face area (Kovacs et al, 2008), a cortical area that is also active in the perception of biological motion (Michels et al, 2005;Peelen & Downing, 2005b) and that may be responsible for the body form matching stage (Giese & Poggio, 2003;. Position-invariant motion aftereffects have been observed in complex motion stimuli (Hershenson, 1984;Meng et al, 2006;Price, Greenwood, & Ibbotson, 2004;Snowden & Milne, 1997) that activate body motion processing areas such as the middle temporal area and the medial superior temporal area.…”

Section: Discussionsupporting

confidence: 81%

“…An aftereffect provides evidence that a particular stimulus has a specific neuronal representation, because the aftereffect is based on the adaptation of neurons at a processing level that represents the stimulus (Clifford et al, 2007;Mather, Pavan, Campana, & Casco, 2008). For example, the face aftereffect is based on the adaptation of face-selective neurons in face-processing areas of the cortex (e.g., Kovacs, Cziraki, Vidnyanszky, Schweinberger, & Greenlee, 2008;Leopold, O'Toole, Vetter, & Blanz, 2001;Webster, Kaping, Mizokami, & Duhamel, 2004). Using this relation between the neural selectivity for a stimulus feature and the associated aftereffect, many studies on the motion aftereffect have traced the stages of motion processing in the cortex and have provided evidence of the existence of multiple motion representations: low-level stages processing local motion energy and high-level stages processing complex patterns of motion (for a review, see Mather et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Adaptation to biological motion leads to a motion and a form aftereffect

Theusner¹,

Lussanet²,

Lappe³

2011

Atten Percept Psychophys

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Recent models have proposed a two-stage process of biological motion recognition. First, template or snapshot neurons estimate the body form. Then, motion is estimated from body form change. This predicts separate aftereffects for body form and body motion. We tested this prediction. Observers viewing leftward-or rightward-facing point-light walkers that walked forward or backward subsequently experienced oppositely directed aftereffects in stimuli ambiguous in the facing or the walking direction. These aftereffects did not originate from adaptation to the motion of the individual light points, because they occurred for limitedlifetime stimuli that restrict local motion. They also occurred when the adaptor displayed a random sequence of body postures that did not induce the walking motion percept. We thus conclude that biological motion gives rise to separate form and motion aftereffects and that body form representations are involved in biological motion perception.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Adaptation to biological motion leads to a motion and a form aftereffect

Theusner¹,

Lussanet²,

Lappe³

2011

Atten Percept Psychophys

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“…Our results show that the right fusiform face area (FFA, for a summary see [49]) shows adaptation effects that are position-invariant and can be evoked by short (500 ms) as well as by long (4500 ms) adaptation durations [50]. The magnitude of the fMRIa effect was similar in all the studied conditions.…”

Section: (B) Neurophysiologymentioning

confidence: 52%

“…Moreover, Fang et al [24] also showed that adaptation duration affects the properties of fMRIa in FFA and OFA. It seems that a reduction of adaptation duration allows the isolation of different steps of face processing [27,50]: while long-term adaptation affects neurons that are sensitive to the physical differences of the stimuli (for example in OFA or LO), as well as position-invariant neurons (in the FFA), short-term adaptation affects position-and viewpoint-invariant neurons (also cf. [27,50]).…”

Section: The Importance Of Adaptation Timementioning

confidence: 99%

Position specificity of adaptation-related face aftereffects

Zimmer

Kovács

2011

Phil. Trans. R. Soc. B

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It has been shown that prolonged exposure to a human face leads to shape-selective visual aftereffects. It seems that these face-specific aftereffects (FAEs) have multiple components, related to the adaptation of earlier and higher level processing of visual stimuli. The largest magnitude of FAE, using long-term adaptation periods, is usually observed at the retinotopic position of the preceding adaptor stimulus. However, FAE is also detected, to a smaller degree, at other retinal positions in a spatially invariant way and this component depends less on the adaptation duration. Several lines of evidences suggest that while the position-specific FAE involves lower level areas of the ventral processing stream, the position-invariant FAE depends on the activation of higher level face-processing areas and the fusiform gyrus in particular. In the present paper, we summarize the available behavioural, electrophysiological and neuroimaging results regarding the spatial selectivity of FAE and discuss their implications for the visual stability of object representations across saccadic eye movements.

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“…The scan was a block design of 16-s-long epochs of faces and nonsense objects (Kovács et al, 2008) interleaved with their Fourier phase-randomized versions, which served as baseline. Stimuli were presented with 0.5 Hz for 300 ms each.…”

Section: Methodsmentioning

confidence: 99%

Dissociating the Effect of Noise on Sensory Processing and Overall Decision Difficulty

Bankó¹,

Gál²,

Körtvélyes³

et al. 2011

J. Neurosci.

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It has been proposed that perceptual decision making involves a task-difficulty component, which detects perceptual uncertainty and guides allocation of attentional resources. It is thought to take place immediately after the early extraction of sensory information and is specifically reflected in a positive component of the event related potentials, peaking at ϳ220 ms after stimulus onset. However, in the previous research, neural processes associated with the monitoring of overall task difficulty were confounded by those associated with the increased sensory processing demands as a result of adding noise to the stimuli. Here we dissociated the effect of phase noise on sensory processing and overall decision difficulty using a face gender categorization task. Task difficulty was manipulated either by adding noise to the stimuli or by adjusting the female/male characteristics of the face images. We found that it is the presence of noise and not the increased overall task difficulty that affects the electrophysiological responses in the first 300 ms following stimulus onset in humans. Furthermore, we also showed that processing of phase-randomized as compared to intact faces is associated with increased fMRI responses in the lateral occipital cortex. These results revealed that noise-induced modulation of the early electrophysiological responses reflects increased visual cortical processing demands and thus failed to provide support for a task-difficulty component taking place between the early sensory processing and the later sensory accumulation stages of perceptual decision making.

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Position-specific and position-invariant face aftereffects reflect the adaptation of different cortical areas

Cited by 69 publications

References 81 publications

Adaptation to biological motion leads to a motion and a form aftereffect

Adaptation to biological motion leads to a motion and a form aftereffect

Position specificity of adaptation-related face aftereffects

Dissociating the Effect of Noise on Sensory Processing and Overall Decision Difficulty

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