Temporal Encoding During Unimodal and Bimodal Odor Processing in the Human Brain

IF 1 4区医学 Q4 Neuroscience

Chemosensory Perception Pub Date : 2018-09-20 DOI:10.1007/s12078-018-9251-0

Anna Oleszkiewicz, Robert Pellegrino, Cagdas Guducu, Linda Farschi, Jonathan Warr, Thomas Hummel

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引用次数: 2

Abstract

In daily life, people encounter a wide range of odors, most of which contain multiple chemical substances. So-called bimodal odors stimulate both the olfactory and trigeminal nerve, and the interaction between these two systems shapes the perception of the odor. However, temporal encoding of these sensory systems during bimodal odor processing has received limited scientific attention.

To investigate this, we recorded the electrophysiological response in 17 participants to relatively unimodal olfactory (strawberry), trigeminal (l-isopulegol) and strongly bimodal (strawberry and l-isopulegol) stimuli.

ERP amplitudes and intensity ratings were significantly bigger for bimodal stimulation, as compared to unimodal stimulations. No significant difference was observed between N1 and P2 response latencies to olfactory and bimodal stimuli while responses to both stimuli showed longer latencies compared to the response of the trigeminal stimulus.

Results provide further evidence of interaction between olfactory and trigeminal systems; additional activation of the olfactory system results in more vigorous electrophysiological responses and the experience of higher intensity. In addition, results indicate that the trigeminal system is faster to react to stimulation.

The current study offers a view on the temporal processing of bimodal odorants that are most likely to be encountered in the environment. We link the more vigorous electrophysiological response to a more complex odorant with activation of different neural structures.

Abstract Image

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人脑单峰和双峰气味处理过程中的时间编码

在日常生活中，人们会接触到各种各样的气味，其中大多数气味含有多种化学物质。所谓的双峰气味同时刺激嗅觉神经和三叉神经，这两个系统之间的相互作用形成了对气味的感知。然而，在双峰气味处理过程中，这些感觉系统的时间编码受到了有限的科学关注。为了研究这一点，我们记录了17名参与者对相对单峰嗅觉(草莓)、三叉嗅觉(l-异戊二酚)和强烈双峰嗅觉(草莓和l-异戊二酚)刺激的电生理反应。与单峰刺激相比，双峰刺激的ERP振幅和强度等级明显更大。嗅觉刺激和双峰刺激的N1和P2反应潜伏期无显著差异，但两者的反应潜伏期均比三叉神经刺激的反应潜伏期长。研究结果进一步证明了嗅觉和三叉神经系统之间的相互作用;嗅觉系统的额外激活导致更强烈的电生理反应和更高强度的体验。此外，研究结果表明，三叉神经系统对刺激的反应速度更快。目前的研究提供了一个关于最有可能在环境中遇到的双峰气味的时间处理的观点。我们将更强烈的电生理反应与更复杂的气味与不同神经结构的激活联系起来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chemosensory Perception 农林科学-神经科学

CiteScore

2.50

自引率

0.00%

发文量

审稿时长

>36 weeks

期刊介绍： Coverage in Chemosensory Perception includes animal work with implications for human phenomena and explores the following areas: Identification of chemicals producing sensory response; Identification of sensory response associated with chemicals; Human in vivo response to chemical stimuli; Human in vitro response to chemical stimuli; Neuroimaging of chemosensory function; Neurological processing of chemoreception; Chemoreception mechanisms; Psychophysics of chemoperception; Trigeminal function; Multisensory perception; Contextual effect on chemoperception; Behavioral response to chemical stimuli; Physiological factors affecting and contributing to chemoperception; Flavor and hedonics; Memory and chemoperception.