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The Dig Task: A Simple Scent Discrimination Reveals Deficits Following Frontal Brain Damage

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Serial reaction time performance following right parietal lobe damage.

Marian E Berryhill¹, Yonatan S Mazuz, Ingrid R Olson

¹Center for Cognitive Neuroscience, Department of Psychology, University of Pennsylvania, Philadelphia, PA 19104, USA. berryhil@psych.upenn.edu

Journal of Neuropsychology

|December 17, 2008

Summary

Implicit sequence learning is possible even with right parietal lobe damage. Some patients with extensive frontal or cerebellar lesions, however, showed no learning, suggesting these areas may be crucial.

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Area of Science:

Cognitive Neuroscience
Neuropsychology

Background:

The serial reaction time task (SRT) assesses implicit sequence learning.
Neuroimaging suggests the parietal lobe is involved in this process, but its necessity is debated.

Purpose of the Study:

To investigate the necessity of the right parietal lobe for implicit sequence learning.
To determine if damage to the right parietal lobe impairs performance on the SRT.

Main Methods:

Tested six patients with unilateral right parietal lesions on the SRT task.
Compared patient performance to age- and education-matched controls.
Assessed both implicit learning and explicit awareness.

Main Results:

Patients with right parietal lesions showed learning comparable to controls.
Two patients with extensive lesions involving frontal or cerebellar regions exhibited no learning.
Implicit sequence learning occurred despite significant right parietal damage.

Conclusions:

The right parietal lobe is not essential for implicit sequence learning.
Frontal or cerebellar regions may play a critical role in implicit sequence learning.
Implicit sequence learning can be preserved following right parietal lobe injury.