Related Experiment Video

Updated: Jan 23, 2026

A Free-breathing fMRI Method to Study Human Olfactory Function
10:42

A Free-breathing fMRI Method to Study Human Olfactory Function

Published on: July 30, 2017

10.1K

Advances in Understanding Parosmia: An fMRI Study

Emilia Iannilli1, Donald A Leopold2, David E Hornung3

  • 1Smell and Taste Clinic, Department of Otorhinolaryngology, TU Dresden, Dresden, Germany.

ORL; Journal for Oto-Rhino-Laryngology and Its Related Specialties
|June 26, 2019
PubMed
Abstract

Insights

Patients with parosmia, a qualitative smell disorder, show distinct brain activation patterns compared to those with only hyposmia (reduced smell). This functional MRI study highlights differences in olfactory processing between these groups.

Area of Science:

  • Neuroscience
  • Olfactory Research
  • Medical Imaging

Background:

  • Parosmia is a qualitative smell disorder often accompanying hyposmia (reduced sense of smell).
  • Qualitative smell disorders are less understood and can be more debilitating than quantitative ones.
  • Previous research has not extensively investigated the central processing of olfactory stimuli in parosmia.

Purpose of the Study:

  • To compare the central olfactory processing in patients with qualitative smell disorders (parosmia) versus quantitative smell disorders (hyposmia).
  • To utilize functional MRI (fMRI) to investigate differences in brain activation patterns during olfactory stimulation.

Main Methods:

  • Functional MRI (fMRI) was used to study 23 patients.
  • Patients were divided into two groups: 12 with hyposmia without parosmia (HYP) and 11 with hyposmia and parosmia (PAR).
  • Groups were matched for age and sex; peach and coffee odors were used for olfactory stimulation.

Main Results:

  • Distinct brain activation patterns were observed between the HYP and PAR groups.
  • HYP patients showed stronger activation in the medial orbitofrontal cortex, anterior cingulate cortex, and parahippocampal gyrus.
  • PAR patients exhibited stronger activation in the thalamus and putamen.

Conclusions:

  • The findings support the hypothesis of specific central olfactory processing patterns differentiating hyposmic patients with and without parosmia.
  • These differences in brain activation suggest distinct neural mechanisms underlying quantitative and qualitative smell disorders.
Keywords:
Functional MRIOlfactionParosmiaQuality of lifeSmell

More Related Videos

Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression08:42

Design and Implementation of an fMRI Study Examining Thought Suppression in Young Women with, and At-risk, for Depression

Published on: May 19, 2015

11.2K
Adaptation of a Haptic Robot in a 3T fMRI08:16

Adaptation of a Haptic Robot in a 3T fMRI

Published on: October 4, 2011

10.1K

Related Concept Videos

Understanding the Self01:28

Understanding the Self

The self is a central aspect of human identity, encompassing an individual’s beliefs, emotions, perceptions, and experiences. It is a cognitive and psychological construct that enables individuals to interpret their traits and behaviors, influencing how they perceive themselves and interact with the world. While personality consists of stable and enduring characteristics, the self is shaped by self-perception and social experiences. This distinction highlights the dynamic nature of the...
248
Understanding Memory01:19

Understanding Memory

Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
1.4K
Understanding Love01:27

Understanding Love

Love, as a multifaceted psychological construct, encompasses emotions, cognitive processes, and behavioral patterns that play a crucial role in human relationships. It extends beyond attraction, manifesting in deep, enduring connections that influence personal well-being and social structures.Psychological Dimensions of LoveLove differs from friendship and mere liking through its depth and intensity. While friendship is built on mutual respect, trust, and companionship, love involves emotional...
182
Understanding Consciousness01:23

Understanding Consciousness

Consciousness can be defined as the state of being aware of and able to think about one's existence, sensations, and surroundings. It encompasses two major components: awareness and arousal. Awareness pertains to the recognition of environmental stimuli and internal states. At the same time, arousal refers to the physiological readiness to engage with these stimuli, which varies significantly between states like sleep and wakefulness.
Sleep, a crucial state, is characterized by reduced...
1.8K
Understanding Sleep01:11

Understanding Sleep

Sleep, an essential biological state, involves significant reductions in physical activity, sensory awareness, and interaction with the environment. This complex physiological process is primarily regulated by specific brain regions, notably the hypothalamus and pons, which govern the sleep-wake cycle or circadian rhythm.
The circadian rhythm, a nearly 24-hour cycle, is deeply influenced by environmental light cues. Light exposure directly affects the hypothalamus, which in turn regulates...
1.4K
Understanding Self-Concept01:20

Understanding Self-Concept

The self-concept encompasses individuals' beliefs about themselves, structured through cognitive frameworks known as self-schemas. These schemas function as mental representations of specific traits or behaviors, influencing how self-relevant information is perceived, processed, and remembered. For example, individuals who are schematic for body weight are more likely to interpret routine experiences—such as dining out or shopping—through the lens of that trait. Conversely, those...
234