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Unformatted text preview: Chapter 16: The frontal lobe
Theories of function
Symptoms of frontal lobe lesions
Clinical neuropsychological assessment I. Anatomy
I. Motor cortex: Brodmann’s area 4 (precentral
gyrus) Premotor and supplementary motor cortex:
Premotor Brodmann’s areas 6 and 8.
Brodmann’s Prefrontal cortex: anterior portion of the frontal
lobe. Dorsolateral prefrontal cortex Inferior prefrontal cortex
Inferior Broca’s area: Brodmann’s area 44. II. Theories of functions
A. Motor cortex Controls different parts of the body to execute
B. Premotor and supplementary motor cortexes Program the sequence of movement. Premotor cortex: plan the sequence of the
movement in response to external cues.
movement Supplementary motor cortex: plan the sequence
of the movement in response to internal events.
of C. Prefrontal cortex
C. Controls the cognitive processes so that
appropriate movements are selected at the
correct time and place.
correct Dorsolateral area: select behavior based on
internal Inferior area: select behavior in context. III. Symptoms of Frontal Lobe Lesions
A. Damage to the motor cortex Loss of fine and independent finger movement. Loss of strength and speed in hand and limb
B. Damage to premotor and supplementary motor
cortex. Difficulty copying a series of facial movements. C. Damage to prefrontal cortex
C. Normal IQ but impaired divergent thinking. Loss of behavioral spontaneity measured by
Loss Thurstone Word-Fluency and Gotman-Milner
Design Fluency test. General loss of spontaneous behavior,
General resulting in patients appearing lethargic or
lazy. Loss of response inhibition measured by
Loss Wisconsin Card Sorting and Stroop tests,
resulting in perseveration.
resulting Impaired memory for the temporal order
Impaired (temporal memory).
(temporal Changes in social behavior and personality Pseudodepression: condition of personality in
which apathy, indifference, and loss of initiative
are Pseudopsychopathy: condition of personality in
which immature behavior, lack of tact and
restraint are apparent.
restraint IV. Clinical neuropsychological assessment.
A. Hand dynamometer: strength of movement.
B. Finger tapping: speed of movement.
C. Facial sequence: movement sequence.
D. Thurstone (Chicago) Word Fluency: verbal
E. Gotman-Milner Design Fluency: nonverbal
F. Wisconsin Card Sorting: response inhibition.
G. Stroop: response inhibition. ...
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- Fall '10