Frontal lobe

<h2 id="structure">Structure</h2>

The frontal lobe is the largest lobe of the brain and makes up about a third of the surface area of each hemisphere.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a> On the <a href="/facts/Anatomical_terms_of_location/IpJ1fq2f">lateral</a> surface of each hemisphere, the <a href="/facts/Central_sulcus/hQPtCGq1">central sulcus</a> separates the frontal lobe from the parietal lobe. The <a href="/facts/Lateral_sulcus/J5WXx9r0">lateral sulcus</a> separates the frontal lobe from the <a href="/facts/Temporal_lobe/U2wLVCrg">temporal lobe</a>.
The frontal lobe can be divided into a lateral, polar, orbital (above the <a href="/facts/Orbit_(anatomy)/lJTMFcqy">orbit</a>; also called basal or <a href="/facts/Anatomical_terms_of_location/IpJ1fq2f">ventral</a>), and <a href="/facts/Anatomical_terms_of_location/IpJ1fq2f">medial</a> part. Each of these parts consists of a particular <a href="/facts/Gyrus/Pqng3B4A">gyrus</a>:

<ul><li>Lateral part: lateral part of the <a href="/facts/Superior_frontal_gyrus/9l4vV2JP">superior frontal gyrus</a>, <a href="/facts/Middle_frontal_gyrus/tqMt8T6P">middle frontal gyrus</a>, and <a href="/facts/Inferior_frontal_gyrus/APew0EfB">inferior frontal gyrus</a></li>
<li>Polar part: <a href="/facts/Frontopolar_cortex/8Y8GBMVG">frontopolar cortex</a>, transverse frontopolar gyri, frontomarginal gyrus.</li>
<li><a href="/facts/Orbitofrontal_cortex/r61gtngW">Orbital part</a>: <a href="/facts/Orbital_gyri/zBMrVxjQ">Lateral orbital gyrus</a>, <a href="/facts/Orbital_gyri/zBMrVxjQ">anterior orbital gyrus</a>, <a href="/facts/Posterior_orbital_gyrus/zBMrVxjQ">posterior orbital gyrus</a>, <a href="/facts/Medial_orbital_gyrus/zBMrVxjQ">medial orbital gyrus</a>, and <a href="/facts/Gyrus_rectus/cjnpUq5T">gyrus rectus</a></li>
<li>Medial part: Medial part of the <a href="/facts/Superior_frontal_gyrus/9l4vV2JP">superior frontal gyrus</a>, <a href="/facts/Cingulate_gyrus/Eerbtdvr">cingulate gyrus</a>.</li></ul>
The gyri are separated by <a href="/facts/Sulcus_(neuroanatomy)/vI7rExrN">sulci</a>. E.g., the precentral gyrus is in front of the central sulcus, and behind the <a href="/facts/Precentral_sulcus/PbVe1pR4">precentral sulcus</a>. The superior and middle frontal gyri are divided by the <a href="/facts/Superior_frontal_sulcus/PuwJVBX5">superior frontal sulcus</a>. The middle and inferior frontal gyri are divided by the <a href="/facts/Inferior_frontal_sulcus/gLJ1zfJI">inferior frontal sulcus</a>.
In humans the frontal lobe reaches full maturity only after the 20s—the prefrontal cortex, in particular, continues in maturing 'til the second and third decades of life<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a>—which, thereafter, marks the cognitive maturity associated with adulthood. A small amount of <a href="/facts/Atrophy/QNxSoxDV">atrophy</a>, however, is normal in the aging person's frontal lobe. Fjell, in 2009, studied atrophy of the brain in people aged 60–91 years. The 142 healthy participants were scanned using <a href="/facts/Magnetic_resonance_imaging/Vh9yG9qq">MRI</a>. Their results were compared to those of 122 participants with <a href="/facts/Alzheimer%2527s_disease/w7Ad6tdg">Alzheimer's disease</a>. A <a href="/facts/Clinical_trial/q8LMr832">follow-up</a> one year later showed there to have been a marked volumetric decline in those with Alzheimer's and a much smaller decline (averaging 0.5%) in the healthy group.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a> These findings corroborate those of Coffey, who in 1992 indicated that the frontal lobe decreases in volume approximately 0.5–1% per year.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a>

<h2 id="function">Function</h2>
The entirety of the frontal cortex can be considered the "action cortex", much as the <a href="/facts/Posterior_cortical_hot_zone/qgIsLzft">posterior cortex</a> is considered the "sensory cortex". It is devoted to action of one kind or another: skeletal movement, ocular movement, speech control, and the expression of emotions. In humans, the largest part of the frontal cortex, the <a href="/facts/Prefrontal_cortex/dypYIrwx">prefrontal cortex</a> (PFC), is responsible for internal, purposeful mental action, commonly called reasoning or <a href="/facts/Prefrontal_synthesis/5CyhkWmY">prefrontal synthesis</a>.
The function of the PFC involves the ability to project future consequences that result from current actions. PFC functions also include override and suppression of socially unacceptable responses as well as differentiation of tasks.
The PFC also plays an important part in integrating longer non-task based memories stored across the brain. These are often memories associated with emotions derived from input from the brain's <a href="/facts/Limbic_system/TelEk6Jl">limbic system</a>. The frontal lobe modifies those emotions, generally to fit socially acceptable norms.
<a href="/facts/Psychological_testing/XexnaLqD">Psychological tests</a> that measure frontal lobe function include <a href="/facts/Tapping_rate/pJyeI6rI">finger tapping</a> (as the frontal lobe controls voluntary movement), the <a href="/facts/Wisconsin_Card_Sorting_Test/A8VyDgmV">Wisconsin Card Sorting Test</a>, and measures of <a href="/facts/Language/IRcTok2q">language</a>, <a href="/facts/Numeracy/zkb2Lo1u">numeracy skills</a>,<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a> and decision making,<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a> all of which are controlled by the frontal lobe.

<h2 id="clinical-significance">Clinical significance</h2>
Main article: <a href="/facts/Frontal_lobe_disorder/QtojohTg">Frontal lobe disorder</a>
Main article: <a href="/facts/Frontal_lobe_injury/2crPo8oW">Frontal lobe injury</a>
<h3>Damage</h3>
Damage to the frontal lobe can occur in a number of ways and result in many different consequences. <a href="/facts/Transient_ischemic_attacks/7eM1EYCg">Transient ischemic attacks</a> (TIAs) also known as mini-strokes, and <a href="/facts/Stroke/DwpjdzY0">strokes</a> are common causes of frontal lobe damage in older adults (65 and over). These strokes and mini-strokes can occur due to the blockage of <a href="/facts/Hemodynamics/HzubzJpn">blood flow</a> to the brain or as a result of the rupturing of an <a href="/facts/Intracranial_aneurysm/xtHmVYrt">aneurysm</a> in a <a href="/facts/Cerebral_artery/8PI8S225">cerebral artery</a>. Other ways in which injury can occur include <a href="/facts/Traumatic_brain_injury/DTq110vw">traumatic brain injuries</a> incurred following accidents, diagnoses such as <a href="/facts/Alzheimer%2527s_disease/w7Ad6tdg">Alzheimer's disease</a> or <a href="/facts/Parkinson%2527s_disease/xpekKj6x">Parkinson's disease</a> (which cause <a href="/facts/Dementia/T0MRDE9I">dementia</a> symptoms), and <a href="/facts/Frontal_lobe_epilepsy/qHjEPfxQ">frontal lobe epilepsy</a> (which can occur at any age).<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> Very often, frontal lobe damage is recognized in those with <a href="/facts/Fetal_Alcohol_Spectrum_Disorder/FWR4hdf7">prenatal alcohol exposure</a>.

<h4>Symptoms</h4>
Common effects of damage to the frontal lobe are varied. Patients who have experienced frontal lobe trauma may know the appropriate response to a situation but display inappropriate responses to those same situations in real life . Similarly, emotions that are felt may not be expressed in the face or voice. For example, someone who is feeling happy would not smile, and the voice would be devoid of emotion. Along the same lines, though, the person may also exhibit excessive, unwarranted displays of emotion. Depression is common in stroke patients. Also common is a loss of or decrease in motivation. Someone might not want to carry out normal daily activities and would not feel "up to it".<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> Those who are close to the person who has experienced the damage may notice changes in behavior.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a> The case of <a href="/facts/Phineas_Gage/ojLpXwkG">Phineas Gage</a> was long considered exemplary of these symptoms, though more <a href="/facts/Phineas_Gage/ojLpXwkG">recent research</a> has suggested that accounts of his personality change have been poorly evidenced. The frontal lobe is the same part of the brain that is responsible for <a href="/facts/Executive_functions/QtflLj55">executive functions</a> such as planning for the future, judgment, decision-making skills, <a href="/facts/Attention_span/NKfmJvF9">attention span</a>, and inhibition. These functions can decrease in someone whose frontal lobe is damaged.<a class="footnote-ref" id="fnref:14" href="#fn:14">14</a>
Consequences that are seen less frequently are also varied. <a href="/facts/Confabulation/5Kf04L4Y">Confabulation</a> may be the most frequently indicated "less common" effect. In the case of confabulation, someone gives false information while maintaining the belief that it is the truth. In a small number of patients, uncharacteristic cheerfulness can be noted. This effect is seen mostly in patients with lesions to the right frontal portion of the brain.<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a><a class="footnote-ref" id="fnref:16" href="#fn:16">16</a>
Another infrequent effect is that of <a href="/facts/Reduplicative_paramnesia/s13WL8gL">reduplicative paramnesia</a>, in which patients believe that the location in which they currently reside is a replica of one located somewhere else. Similarly, those who experience <a href="/facts/Capgras_syndrome/D28RkjsC">Capgras syndrome</a> after frontal lobe damage believe that an identical "replacement" has taken the identity of a close friend, relative, or other person and is posing as that person. This last effect is seen mostly in schizophrenic patients who also have a neurological disorder in the frontal lobe.<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a><a class="footnote-ref" id="fnref:18" href="#fn:18">18</a>

<h4>DNA damage</h4>
In the human frontal cortex, a set of genes undergo reduced expression after age 40 and especially after age 70.<a class="footnote-ref" id="fnref:19" href="#fn:19">19</a> This set includes genes that have key functions in <a href="/facts/Synaptic_plasticity/rdVFxItN">synaptic plasticity</a> important in learning and memory, <a href="/facts/Vesicular_transport/WoIhxVhH">vesicular transport</a> and <a href="/facts/Mitochondrion/ErHqrdJ1">mitochondrial function</a>. During <a href="/facts/Ageing/AxL4qCW4">aging</a>, <a href="/facts/DNA_damage_(naturally_occurring)/CjGTLKGl">DNA damage</a> is markedly increased in the <a href="/facts/Promoter_(genetics)/YDYBzLfg">promoters</a> of the genes displaying reduced expression in the frontal cortex. In cultured human neurons, these promoters are selectively damaged by oxidative stress.<a class="footnote-ref" id="fnref:20" href="#fn:20">20</a>
Individuals with <a href="/facts/HIV/ulY2rgzu">HIV</a> associated neurocognitive disorders accumulate nuclear and <a href="/facts/Mitochondrial_DNA/goC0ex0X">mitochondrial DNA</a> damage in the frontal cortex.<a class="footnote-ref" id="fnref:21" href="#fn:21">21</a>

<h3>Genetic</h3>
A report from the <a href="/facts/National_Institute_of_Mental_Health/EqxY3XXy">National Institute of Mental Health</a> says a <a href="/facts/Gene/e1swwPY6">gene</a> variant of <a href="/facts/Catechol-O-methyltransferase/GlKMEABG">(COMT)</a> that reduces dopamine activity in the <a href="/facts/Prefrontal_cortex/dypYIrwx">prefrontal cortex</a> is related to poorer performance and inefficient functioning of that brain region during working memory, tasks, and to a slightly increased risk for <a href="/facts/Schizophrenia/FMP4lQ57">schizophrenia</a>.<a class="footnote-ref" id="fnref:22" href="#fn:22">22</a>

<h2 id="history">History</h2>
<h3>Psychosurgery</h3>
In the early 20th century, a medical treatment for <a href="/facts/Mental_illness/EPNjFtFf">mental illness</a>, first developed by <a href="/facts/Portugal/lYzwDQ63">Portuguese</a> <a href="/facts/Neurologist/TXYEMSYI">neurologist</a> <a href="/facts/Egas_Moniz/GtjesMjV">Egas Moniz</a>, involved damaging the pathways connecting the frontal lobe to the <a href="/facts/Limbic_system/TelEk6Jl">limbic system</a>. A frontal <a href="/facts/Lobotomy/TcWkUk2b">lobotomy</a> (sometimes called frontal leucotomy) successfully reduced distress but at the cost of often blunting the subject's emotions, volition and <a href="/facts/Personality_psychology/AWhpI44I">personality</a>. The indiscriminate use of this <a href="/facts/Psychosurgery/kR2tltWx">psychosurgical</a> procedure, combined with its severe side effects and a <a href="/facts/Mortality_rate/s4gmxyFV">mortality rate</a> of 7.4 to 17 per cent,<a class="footnote-ref" id="fnref:23" href="#fn:23">23</a> earned it a bad reputation. The frontal lobotomy has largely died out as a psychiatric treatment. More precise psychosurgical procedures are still used, although rarely. They may include anterior capsulotomy (bilateral thermal lesions of the anterior limbs of the <a href="/facts/Internal_capsule/vceryHK0">internal capsule</a>) or the <a href="/facts/Bilateral_cingulotomy/BHG64y5w">bilateral cingulotomy</a> (involving lesions of the anterior <a href="/facts/Cingulate_gyrus/Eerbtdvr">cingulate gyri</a>) and might be used to treat otherwise untreatable <a href="/facts/Obsessive-compulsive_disorder/bIhDh4dz">obsessional disorders</a> or <a href="/facts/Clinical_depression/l2lQeWqr">clinical depression</a>.

<h3>Theories of function</h3>
Theories of frontal lobe function can be separated into four categories:

<ul><li>Single-process theories, which propose that "damage to a single process or system is responsible for a number of different <a href="/facts/Dysexecutive_syndrome/g1plXKK5">dysexecutive symptoms</a>"<a class="footnote-ref" id="fnref:24" href="#fn:24">24</a></li>
<li>Multi-process theories, which propose "that the frontal lobe executive system consists of a number of components that typically work together in everyday actions (heterogeneity of function)"<a class="footnote-ref" id="fnref:25" href="#fn:25">25</a></li>
<li>Construct-led theories, which propose that "most if not all frontal functions can be explained by one construct (homogeneity of function) such as working memory or inhibition"<a class="footnote-ref" id="fnref:26" href="#fn:26">26</a></li>
<li>Single-symptom theories, which propose that a specific dysexecutive symptom (e.g., confabulation) is related to the processes and construct of the underlying structures.<a class="footnote-ref" id="fnref:27" href="#fn:27">27</a></li></ul>
Other theories include:

<ul><li>Stuss (1999) suggests a differentiation into two categories according to homogeneity and heterogeneity of function.</li>
<li>Grafman's managerial knowledge units (MKU) / structured event complex (SEC) approach (cf. Wood & Grafman, 2003)</li>
<li>Miller & Cohen's integrative theory of prefrontal functioning (e.g. Miller & Cohen, 2001)</li>
<li>Rolls's stimulus-reward approach and Stuss's anterior attentional functions (Burgess & Simons, 2005; Burgess, 2003; Burke, 2007).</li></ul>
It may be highlighted that the theories described above differ in their focus on certain processes/systems or construct-lets. Stuss (1999) remarks that the question of homogeneity (single construct) or heterogeneity (multiple processes/systems) of function "may represent a problem of semantics and/or incomplete functional analysis rather than an unresolvable dichotomy" (p. 348). However, further research will show if a unified theory of frontal lobe function that fully accounts for the diversity of functions will be available.

<h2 id="other-primates">Other primates</h2>
Many scientists had thought that the frontal lobe was disproportionately enlarged in humans compared to other primates. This was thought to be an important feature of human evolution and seen as the primary reason why human cognition differs from that of other primates. However, this view in relation to great apes has since been challenged by <a href="/facts/Neuroimaging/dA5Cteaf">neuroimaging</a> studies. Using <a href="/facts/Magnetic_resonance_imaging/Vh9yG9qq">magnetic resonance imaging</a> to determine the volume of the frontal cortex in humans, all extant ape species, and several <a href="/facts/Monkey/ARjd5RRr">monkey</a> species, it was found that the human frontal cortex was not relatively larger than the cortex of other <a href="/facts/Hominidae/ILn1SYKB">great apes</a>, but was relatively larger than the frontal cortex of <a href="/facts/Gibbon/ArzDSTmr">lesser apes</a> and the monkeys.<a class="footnote-ref" id="fnref:28" href="#fn:28">28</a> The higher cognition of the humans is instead seen to relate to a greater connectedness given by <a href="/facts/Nerve_tract/GtK41Ck4">neural tracts</a> that do not affect the cortical volume.<a class="footnote-ref" id="fnref:29" href="#fn:29">29</a> This is also evident in the <a href="/facts/Neural_pathway/zDpRfS6S">pathways</a> of the <a href="/facts/Large_scale_brain_networks/5TNp5zh5">language network</a> connecting the frontal and temporal lobes.<a class="footnote-ref" id="fnref:30" href="#fn:30">30</a>

<h2 id="see-also">See also</h2>
This article uses <a href="/facts/Anatomical_terminology/n3IASQlr">anatomical terminology</a>.
<ul><li><a href="/facts/Broca%2527s_area/lV3X3Yb6">Broca's area</a></li>
<li><a href="/facts/Limen_insulae/G7godNbL">Limen insulae</a></li>
<li><a href="/facts/List_of_regions_in_the_human_brain/N8r44v6P">List of regions in the human brain</a></li></ul>

<h2 id="further-reading">Further reading</h2>
<ul><li>Donald T. Stuss and Robert T. Knight (Eds.), Principles of Frontal Lobe Function, Second Edition, Oxford University Press, New York, 2013.</li></ul>
<h2 id="external-links">External links</h2>

Wikimedia Commons has media related to Frontal lobe.

<ul><li><a href="https://www.neuinfo.org/mynif/search.php?q=Frontal%20Lobe&t=data&s=cover&b=0&r=20">NIF Search – Frontal Lobe</a> <a href="https://web.archive.org/web/20130703215911/https://www.neuinfo.org/mynif/search.php?q=Frontal%20Lobe&t=data&s=cover&b=0&r=20">Archived</a> 2013-07-03 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a> via the <a href="/facts/Neuroscience_Information_Framework/gJEwQcaF">Neuroscience Information Framework</a></li></ul>

<h2 id="references">References</h2>

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</ol>

Frontal lobe open-in-new

Frontal lobe