Circling, hemispheric asymmetry, and left-right discrimination

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Animal Models

Background:

• Handedness and motor preferences are studied in humans and animals.
• Amphetamine-induced circling is a common measure of lateralization in rodents.
• Previous research suggests a link between rotational preference and cognitive function.

Purpose of the Study:

• To investigate the relationship between different measures of side preference and spatial discrimination learning in rats.
• To determine if amphetamine-induced circling is a reliable predictor of learning ability.

Main Methods:

• Three measures of side preference were assessed: amphetamine-induced circling, open field exit side, and tail suspension turn side.
• Rats were subsequently tested on a spatial left-right discrimination task.
• Performance was compared between rats exhibiting different rotational preferences.

Main Results:

• Rats exhibiting amphetamine-induced circling demonstrated significantly better learning and retention of the spatial discrimination task.
• The side of exit from the open field and the side of turn during tail suspension were not correlated with discrimination learning.
• This finding replicates and strengthens previous observations linking amphetamine-induced rotation to enhanced spatial learning.

Conclusions:

• Amphetamine-induced circling is a valid indicator of enhanced spatial learning and memory in rats.
• Other measures of motor preference, such as open field exit or tail suspension turns, do not predict spatial learning.
• Lateralization, specifically as measured by amphetamine-induced circling, may play a crucial role in cognitive processes like spatial navigation.