Review
Object Domain and Modality in the Ventral Visual Pathway

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Trends

A wave of recent studies has reported similar domain preference effects in ventral occipital temporal cortex (VOTC) in sighted and congenitally blind individuals, leading to the contention that object representation in this region is multi-modal.

However, the effects of visual deprivation on object category selectivity paint an intriguing pattern of heterogeneity: selectivity to spatial navigation stimuli and manipulable artifacts found to be robustly multi-modal, whereas selectivity to animate objects reliably present only for sighted individuals when processing visual stimuli.

We formulate a novel conjecture about the nature of representations in VOTC: representation types are partly driven by the nature of the mapping between object visual properties and other object properties, which differ between animate and inanimate objects.

The nature of domain-specific organization in higher-order visual cortex (ventral occipital temporal cortex, VOTC) has been investigated both in the case of visual experience deprivation and of modality of stimulation in sighted individuals. Object domain interacts in an intriguing and revelatory way with visual experience and modality of stimulation: selectivity for artifacts and scene domains is largely immune to visual deprivation and is multi-modal, whereas selectivity for animate items in lateral posterior fusiform gyrus is present only with visual stimulation. This domain-by-modality interaction is not readily accommodated by existing theories of VOTC representation. We conjecture that these effects reflect a distinction between the visual features that characterize different object domains and their interaction with different types of downstream computational systems.

Section snippets

Ventral Visual Cortex: Visual or Multi-Modal?

A core assumption of cognitive science and cognitive neuroscience is that the brain processes information at various levels of representation, progressing from those closely tied to stimulus features to increasingly more general and abstract representations. One of the mysteries in this framework is the transition from modality specific representations – those explicable fully in the language of a given modality – to representations that capture other properties of the object – such as, for

Domain Specificity Effects across Different Modalities Are Different

When sighted individuals view pictures, various clusters in VOTC are more responsive to certain categories of objects, such as faces, bodies, tools, or places. The overall distribution of category preference follows a broad animate versus inanimate distinction, with a further differentiation within the inanimate domain between manipulable and non-manipulable objects. This results in a tripartite organization, from ventral medial regions (parahippocampal and medial fusiform) showing preference

Relationships between Visual and Other Object Properties

We formulate a novel conjecture about one of the factors that determines the nature of representations in VOTC: the difference across object domains in terms of modality effects lies in the relationship between visual shape and its functional relevance, understood as the types of computations it triggers downstream and ultimately its connectivity structure. Visual shape strongly constrains the way in which we interact physically with inanimate objects, but much less so and in a far less

Concluding Remarks

We began this review article by drawing attention to an empirical phenomenon regarding the effect of visual experience (and stimulus input) on object representations in higher-order visual cortex, showing that contrary to recent claims that this territory is multi-modal, there is a clear animate/inanimate dimension along which effects of modality differ. This empirical pattern motivates a novel conjecture about the nature of representations in VOTC: representation types are partly driven by the

Acknowledgments

This work was supported by the National Basic Research Program of China (2013CB837300) and National Natural Science Foundation of China (31221003, 31500882). A.C. was supported by the Fondazione Cassa di Risparmio di Trento e Rovereto.

Glossary

Connectional fingerprints
the unique set of anatomical or functional connections a cortical region owns, which could be measured as the vector of the cortical region's connection strengths with other cerebral regions.
Functional fingerprints
the unique response properties a cortical region exhibits, which could be measured as vector of the region's response strengths to a variety of stimuli or tasks (e.g., object categories).
Multi-modal
for the purpose of this review, multi-modal was used to mean

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