Lateral orientation, eye movements and dichotic listening

Area of Science:

• Cognitive Neuroscience
• Psychology
• Neuroscience

Background:

• Lateral orientation (eye or head turn) has been suggested to influence hemispheric asymmetry in dichotic listening tasks.
• Previous research has not consistently controlled for attentional biases introduced by head or eye positioning.

Purpose of the Study:

• To investigate the effects of forced head and eye turns on consonant-vowel dichotic listening performance.
• To examine the relationship between spontaneous conjugate lateral eye movements (CLEM) and dichotic listening ear advantages.
• To explore how characteristic hemispheric arousal influences perceptual laterality.

Main Methods:

• Administered a consonant-vowel dichotic test using a forced-attention method to control for attentional bias.
• Measured spontaneous conjugate lateral eye movements (CLEM) in response to questioning.
• Recruited 54 right-handed university students (29 male, 25 female).

Main Results:

• Right-lookers on the CLEM test exhibited an enhanced right ear advantage.
• Left-lookers on the CLEM test demonstrated a diminished right ear advantage.
• No significant relationship was found between dichotic listening performance and forced head or eye turning.

Conclusions:

• Spontaneous lateral eye movements are associated with hemispheric asymmetry in auditory perception.
• Characteristic hemispheric arousal, as indicated by CLEM, can modulate ear advantages in dichotic listening.
• The findings highlight the importance of controlling for attentional bias in studies of perceptual laterality.