A noseful of objects

  title={A noseful of objects},
  author={Christian Margot},
  journal={Nature Neuroscience},
  • C. Margot
  • Published 1 July 2009
  • Biology, Psychology
  • Nature Neuroscience
How are volatile molecules entering the nose converted to odor percepts in the brain? A fMRI study finds that distributed patterns of activity in the human posterior piriform cortex code the perceived category of odorants. This categorization of odors into objects is independent of their chemical structure. 

The perception of odor objects in everyday life: a review on the processing of odor mixtures

The present review gathers the recent findings, as observed in animals, healthy subjects, and/or individuals with affective disorders, supporting the perception of complex odor stimuli as odor objects, and discusses peripheral to central processing, and cognitive and behavioral significance.

A Masked Aversive Odor Cannot Be Discriminated From the Masking Odor but Can Be Identified Through Odor Quality Ratings and Neural Activation Patterns

Although the masked and pure stimuli were not discriminated in the forced-choice task, quality ratings on a dimensional scale differed and an increased activation of the insula and ventral striatum/putamen for the pure in contrast to the fully masked odor, hence revealing a difference in neuronal processing.

Emotion elicitation by odors and their influence on behavior and cognitive performance

This work aims at decoding the complex mesh of odor-born feelings and their underlying mechanisms at the behavioral, physiological and neural level in humans.

Olfaction as a soldier-- a review of the physiology and its present and future use in the military

The biochemistry of olfactory nerve stimulation is unique from that of other similar pathways and has to sort the information from the input as well as integrate it with other inputs from the brain to develop a coherent understanding of the input.

Office-Based Olfaction Assessment.

In this review, some essential information on office-based olfaction assessment is given and important aspects of the evaluation are covered, especially from a clinical perspective.

chapter 19 R epr esentionalism About Consciousness

To a first approximation, representationalism about sensory consciousness holds that sensory consciousness (for instance, being conscious of a red and round thing, or being conscious of the aroma of

The Real Trouble with Phenomenal Externalism: New Empirical Evidence for a Brain-Based Theory of Consciousness

The traditional view of the sensible qualities locates them in the head. But within philosophy there has recently been a kind of externalist revolution. While most scientists would still locate the

What does the term ‘complexity’ mean in the world of wine?

  • C. SpenceQ. Wang
  • Psychology
    International Journal of Gastronomy and Food Science
  • 2018

Dynamic mixtures: challenges and opportunities for the amplification and sensing of scents.

The potential of DCC to impact and modulate the biological and chemical properties of mixtures of bioactive volatile compounds to gain a more fundamental understanding of the properties of compound mixtures in molecular recognition is focused on.

Running head : TASTE PREFERENCE DEVELOPMENT 1 The Development of Taste Preferences and Health Implications

This literature review investigates the factors that influence taste and taste preference development, specifically high fat and high salt diets during gestation, as well as the subsequent health risks associated with each tastant alone and in combination.



Olfactory perceptual stability and discrimination

It is found that ensembles of rat olfactory bulb neurons decorrelate complex mixtures that vary by as little as a single missing component, whereas olfatory (piriform) cortical neural ensemble perform pattern completion in response to an absent component, essentially filling in the missing information and allowing perceptual stability.

Odor quality coding and categorization in human posterior piriform cortex

It is found that spatially distributed ensemble activity in human posterior piriform cortex (PPC) coincides with perceptual ratings of odor quality, such that odorants with more (or less) similar fMRI patterns were perceived as more ( or less) alike.

Separate encoding of identity and similarity of complex familiar odors in piriform cortex

The results suggest aPCX and pPCX play different roles in the processing of familiar odors and are consistent with an experience-dependent encoding (perceptual learning) of synthetic odorant identity in a PCX and an experience of odor similarity or odor quality in p PCX.

Odour Perception: An Object-Recognition Approach

It is argued here that this occurs by rapid central adaptation to background odours combined with a pattern-matching system to recognise discrete sets of spatial and temporal olfactory features—an odour object.

Maps of odorant molecular features in the Mammalian olfactory bulb.

This review summarizes the emerging view of the spatial organization of the odorant receptor maps and suggests that the glomerular sheet represents the characteristic molecular features in a systematic, gradual, and multidimensional fashion.

Innate versus learned odour processing in the mouse olfactory bulb

It is shown that, in dorsal-zone-depleted mice, the dorsal domain of the olfactory bulb was devoid of glomerular structures, although second-order neurons were present in the vacant areas, which indicates that aversive information is received in the ofactory bulb by separate sets ofglomeruli, those dedicated for innate and those for learned responses.

Parallel-distributed processing in olfactory cortex: new insights from morphological and physiological analysis of neuronal circuitry.

To increase the accessibility of findings for PC and to advertise its substantial potential as a model for experimental and modeling analysis of associative processes, parallels are described between PC and the hippocampal formation, inferotemporal visual cortex and prefrontal cortex.

Aversive Learning Enhances Perceptual and Cortical Discrimination of Indiscriminable Odor Cues

These findings indicate that aversive learning induces piriform plasticity with corresponding gains in odor enantiomer discrimination, underscoring the capacity of fear conditioning to update perceptual representation of predictive cues, over and above its well-recognized role in the acquisition of conditioned responses.