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Related Experiment Videos

Which hemisphere falls asleep first?

M Casagrande1, C Violani, L De Gennaro

  • 1Dipartimento di Psicologia, Università di Roma, La Sapienza, Italy.

Neuropsychologia
|July 1, 1995
PubMed
Summary
This summary is machine-generated.

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During sleep onset, the left hemisphere shows greater impairment in reaction time and motor tasks. This suggests the left hemisphere falls asleep before the right hemisphere.

Area of Science:

  • Neuroscience
  • Sleep Research
  • Cognitive Psychology

Background:

  • Hemispheric asymmetries in cognitive functions are well-documented.
  • Understanding brain activity during sleep onset is crucial for sleep disorder diagnosis.

Purpose of the Study:

  • To investigate hemispheric asymmetries during the sleep onset period.
  • To determine if different brain hemispheres exhibit varying sleep onset patterns.

Main Methods:

  • Assessed normal subjects using behavioral tasks during sleep onset.
  • Measured reaction times to acoustic stimuli.
  • Analyzed finger tapping task performance.

Main Results:

  • The left hemisphere demonstrated a stronger impairment in both reaction time and motor tasks.

Related Experiment Videos

  • Right-hand performance, linked to the left hemisphere, was significantly affected.
  • Evidence suggests the left hemisphere enters sleep earlier than the right.

    • Conclusions:

    • The left hemisphere appears to be more vulnerable to sleep onset effects.
    • Hemispheric differences in sleep onset may contribute to cognitive impairments experienced when sleepy.