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Related Concept Videos

Synesthesia01:27

Synesthesia

Synesthesia is a remarkable condition where stimulation of one sensory or cognitive pathway leads to automatic, involuntary experiences in a second sensory or cognitive pathway. People with synesthesia experience a blending or crossing of their senses, such as sight and sound, leading to cross-modal sensations. In this condition, the stimulation of one sense, such as hearing a number or musical note, triggers an experience of another sense, like sensing a specific color, taste, or smell. People...
Biological Clocks and Seasonal Responses02:45

Biological Clocks and Seasonal Responses

The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
Sleep-Wake Cycles01:24

Sleep-Wake Cycles

Sleep is an essential physiological process vital to maintaining overall well-being. The reticular activating system (RAS), a network of neurons in the brainstem, regulates wakefulness and sleep. While it may seem passive, sleep consists of distinct cycles, each with its unique characteristics and functions. Two key sleep phases are non-rapid eye movement (NREM) and  rapid eye movement (REM).
NREM Sleep
NREM sleep comprises four progressive stages that seamlessly merge:
Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
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Sympathetic Activation

The sympathetic division can influence tissues and organs by releasing norepinephrine at peripheral synapses and distributing epinephrine and norepinephrine through the bloodstream. In times of crisis or stress, sympathetic activation occurs, which is regulated by sympathetic centers in the hypothalamus. As a result, sympathetic activation prepares the body for physical exertion, rapid ATP production, and heightened alertness, allowing individuals to respond effectively to challenging or...
Preparedness and Phobias01:09

Preparedness and Phobias

Human fear responses to certain stimuli, such as darkness, heights, deep water, and blood, can often arise despite the absence of direct negative experiences. This phenomenon is rooted in evolutionary psychology, which posits that humans have developed a predisposition to fear stimuli that historically posed significant survival threats. This predisposition, known as preparedness, suggests that early humans who developed a fear of potentially dangerous entities, such as venomous snakes and...

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Related Experiment Video

Updated: Jun 16, 2026

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
08:33

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Published on: February 26, 2016

Synophrys.

Matthias Möhrenschlager1, Martin Lauenstein, Johannes Ring

  • 1Department of Dermatology and Allergology, Allergieklinik, Davos, Switzerland. Matthias.Moehrenschlager@hgk.ch

European Journal of Medical Genetics
|February 16, 2010
PubMed
Summary
This summary is machine-generated.

Synophrys, or a unibrow, can indicate syndromal disorders but is not always a definitive sign. This case highlights a man with a unibrow and other symptoms, yet no underlying syndrome.

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Area of Science:

  • Dermatology
  • Clinical Genetics

Background:

  • Synophrys (medial eyebrow meeting) is a potential cutaneous marker for syndromal disorders like Cornelia de Lange syndrome.
  • Understanding the diagnostic significance of synophrys is crucial in clinical practice.

Observation:

  • A 31-year-old male presented with synophrys, forming a single band of terminal hair across the brow.
  • The patient exhibited cold-inducible urticaria, xanthelasma, and long eyelashes.

Findings:

  • Despite the presence of synophrys and other dermatological findings, the patient showed no clinical signs of a syndromal disorder.
  • This case underscores that synophrys is not pathognomonic for any specific illness.

Implications:

  • Synophrys alone is insufficient for diagnosing syndromal disorders.
  • Further investigation is warranted when synophrys presents with other clinical features to rule out or confirm underlying conditions.