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Using time-to-contact information to assess potential collision modulates both visual and temporal prediction networks.

Coull JT, Vidal F, Goulon C, Nazarian B, Craig C - Front Hum Neurosci (2008)

Bottom Line: We also demonstrated that the temporal derivative of the perceptual index tau (tau-dot) held predictive value for making collision judgements and varied inversely with activity in primary visual cortex (V1).Finally, egocentric viewpoints provoked a response bias for reporting collisions, rather than no-collisions, reflecting increased caution for head-on approaches.Associated increases in SMA activity suggest motor preparation mechanisms were engaged, despite the perceptual nature of the task.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Neurobiologie de la Cognition, Université Aix-Marseille & CNRS Marseille, France. jennifer.coull@univ-provence.fr

ABSTRACT
Accurate estimates of the time-to-contact (TTC) of approaching objects are crucial for survival. We used an ecologically valid driving simulation to compare and contrast the neural substrates of egocentric (head-on approach) and allocentric (lateral approach) TTC tasks in a fully factorial, event-related fMRI design. Compared to colour control tasks, both egocentric and allocentric TTC tasks activated left ventral premotor cortex/frontal operculum and inferior parietal cortex, the same areas that have previously been implicated in temporal attentional orienting. Despite differences in visual and cognitive demands, both TTC and temporal orienting paradigms encourage the use of temporally predictive information to guide behaviour, suggesting these areas may form a core network for temporal prediction. We also demonstrated that the temporal derivative of the perceptual index tau (tau-dot) held predictive value for making collision judgements and varied inversely with activity in primary visual cortex (V1). Specifically, V1 activity increased with the increasing likelihood of reporting a collision, suggesting top-down attentional modulation of early visual processing areas as a function of subjective collision. Finally, egocentric viewpoints provoked a response bias for reporting collisions, rather than no-collisions, reflecting increased caution for head-on approaches. Associated increases in SMA activity suggest motor preparation mechanisms were engaged, despite the perceptual nature of the task.

No MeSH data available.


Related in: MedlinePlus

Neural activity varies as a function of tau-dot. Activity in (A) primary visual cortex (V1) and (B) Supplementary Motor Area (SMA) increased as tau-dot value decreased, indicating a parametric response to the increasing certitude of a collision (see Figure 2 for the behavioural corollary of this response). V1 activity was modulated during both allocentric (yellow) and egocentric (red) viewpoints, whereas SMA activity was modulated during egocentric viewpoints only. Activations are displayed on transverse (z = 9 mm) and coronal (y = 0 mm) slices of the averaged structural MRI of all 12 subjects.
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Figure 4: Neural activity varies as a function of tau-dot. Activity in (A) primary visual cortex (V1) and (B) Supplementary Motor Area (SMA) increased as tau-dot value decreased, indicating a parametric response to the increasing certitude of a collision (see Figure 2 for the behavioural corollary of this response). V1 activity was modulated during both allocentric (yellow) and egocentric (red) viewpoints, whereas SMA activity was modulated during egocentric viewpoints only. Activations are displayed on transverse (z = 9 mm) and coronal (y = 0 mm) slices of the averaged structural MRI of all 12 subjects.

Mentions: Linear modulations indexed the likelihood of making a contact versus no-contact judgement. The lower the tau-dot value (i.e. the more likely to be associated with a contact judgement) the more activity increased in visual area V1/2 for both egocentric and allocentric viewpoints (Figure 4A), and additionally in SMA for egocentric viewpoints only (Figure 4B). The higher the tau-dot value (i.e. the more likely to be associated with a no-contact judgement), the more activity increased in anterior cingulate for both egocentric and allocentric viewpoints, and additionally in left IPS, bilateral inferior frontal cortex and left ventromedial visual cortex for egocentric viewpoints only (Table 4).


Using time-to-contact information to assess potential collision modulates both visual and temporal prediction networks.

Coull JT, Vidal F, Goulon C, Nazarian B, Craig C - Front Hum Neurosci (2008)

Neural activity varies as a function of tau-dot. Activity in (A) primary visual cortex (V1) and (B) Supplementary Motor Area (SMA) increased as tau-dot value decreased, indicating a parametric response to the increasing certitude of a collision (see Figure 2 for the behavioural corollary of this response). V1 activity was modulated during both allocentric (yellow) and egocentric (red) viewpoints, whereas SMA activity was modulated during egocentric viewpoints only. Activations are displayed on transverse (z = 9 mm) and coronal (y = 0 mm) slices of the averaged structural MRI of all 12 subjects.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2572212&req=5

Figure 4: Neural activity varies as a function of tau-dot. Activity in (A) primary visual cortex (V1) and (B) Supplementary Motor Area (SMA) increased as tau-dot value decreased, indicating a parametric response to the increasing certitude of a collision (see Figure 2 for the behavioural corollary of this response). V1 activity was modulated during both allocentric (yellow) and egocentric (red) viewpoints, whereas SMA activity was modulated during egocentric viewpoints only. Activations are displayed on transverse (z = 9 mm) and coronal (y = 0 mm) slices of the averaged structural MRI of all 12 subjects.
Mentions: Linear modulations indexed the likelihood of making a contact versus no-contact judgement. The lower the tau-dot value (i.e. the more likely to be associated with a contact judgement) the more activity increased in visual area V1/2 for both egocentric and allocentric viewpoints (Figure 4A), and additionally in SMA for egocentric viewpoints only (Figure 4B). The higher the tau-dot value (i.e. the more likely to be associated with a no-contact judgement), the more activity increased in anterior cingulate for both egocentric and allocentric viewpoints, and additionally in left IPS, bilateral inferior frontal cortex and left ventromedial visual cortex for egocentric viewpoints only (Table 4).

Bottom Line: We also demonstrated that the temporal derivative of the perceptual index tau (tau-dot) held predictive value for making collision judgements and varied inversely with activity in primary visual cortex (V1).Finally, egocentric viewpoints provoked a response bias for reporting collisions, rather than no-collisions, reflecting increased caution for head-on approaches.Associated increases in SMA activity suggest motor preparation mechanisms were engaged, despite the perceptual nature of the task.

View Article: PubMed Central - PubMed

Affiliation: Laboratoire de Neurobiologie de la Cognition, Université Aix-Marseille & CNRS Marseille, France. jennifer.coull@univ-provence.fr

ABSTRACT
Accurate estimates of the time-to-contact (TTC) of approaching objects are crucial for survival. We used an ecologically valid driving simulation to compare and contrast the neural substrates of egocentric (head-on approach) and allocentric (lateral approach) TTC tasks in a fully factorial, event-related fMRI design. Compared to colour control tasks, both egocentric and allocentric TTC tasks activated left ventral premotor cortex/frontal operculum and inferior parietal cortex, the same areas that have previously been implicated in temporal attentional orienting. Despite differences in visual and cognitive demands, both TTC and temporal orienting paradigms encourage the use of temporally predictive information to guide behaviour, suggesting these areas may form a core network for temporal prediction. We also demonstrated that the temporal derivative of the perceptual index tau (tau-dot) held predictive value for making collision judgements and varied inversely with activity in primary visual cortex (V1). Specifically, V1 activity increased with the increasing likelihood of reporting a collision, suggesting top-down attentional modulation of early visual processing areas as a function of subjective collision. Finally, egocentric viewpoints provoked a response bias for reporting collisions, rather than no-collisions, reflecting increased caution for head-on approaches. Associated increases in SMA activity suggest motor preparation mechanisms were engaged, despite the perceptual nature of the task.

No MeSH data available.


Related in: MedlinePlus