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Lateralization for orientation in split-brain monkeys.

Behavioural Brain Research

|December 1, 1983

Summary

This summary is machine-generated.

Split-brain monkeys showed that the left cerebral hemisphere learned line slope discrimination faster than the right. This spatial task lateralization was specific to the stimuli used.

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Area of Science:

Neuroscience
Cognitive Science
Primate Behavior

Background:

Cerebral hemispheres exhibit functional specialization.
The right hemisphere is typically dominant for spatial discrimination in humans.

Purpose of the Study:

To investigate hemispheric specialization in split-brain monkeys.
To determine if spatial discrimination abilities are lateralized in non-human primates.

Main Methods:

Split-brain surgery was performed on 8 monkeys.
Monkeys learned to discriminate lines differing by 15 degrees in slope using each hemisphere.
Discrimination of simple patterns was also tested.

Main Results:

The left hemisphere learned the line slope discrimination task significantly faster than the right hemisphere.

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Both hemispheres performed equally well on simple pattern discrimination tasks.

Conclusions:

Hemispheric specialization for spatial discrimination exists in monkeys.
This lateralized ability is stimulus-dependent, not a general cognitive function.