Why pausing intuitive thinking favours complex reasoning

One of the most recent and sig­ni­fic­ant efforts to unravel the mys­ter­ies of how our psyche works is the rap­id pro­gress made in the field of cog­nit­ive psy­cho­logy. These advances have revolu­tion­ised our under­stand­ing of the human mind, mark­ing a new era in the study of men­tal mech­an­isms. One of the most not­able con­tri­bu­tions comes from Daniel Kahne­man, co-founder of beha­vi­our­al eco­nom­ics and win­ner of the 2002 Nobel Prize in Eco­nom­ics. His major con­tri­bu­tion lies in the dis­tinc­tion he made between our dif­fer­ent men­tal states, a bold and now indis­pens­able hypo­thes­is. He pro­posed that our men­tal states can oscil­late over time between two dia­met­ric­ally opposed modes of think­ing: the first, called Sys­tem 1, is fast, intu­it­ive and auto­mat­ic, while the second, Sys­tem 2, is char­ac­ter­ised by its slow­ness, in-depth ana­lys­is and thought­ful nature. 

To illus­trate these two men­tal sys­tems, let’s take a simple example: when asked “What is 2 + 2?”, Sys­tem 1 provides the answer using a men­tal routine. But if we ask “What is 17 x 24?”, Sys­tem 2 is required to mobil­ise men­tal resources to break down the prob­lem into sim­pler com­pon­ents. How­ever, the trans­ition from Sys­tem 1 to Sys­tem 2 is not auto­mat­ic: it requires the detec­tion of con­flict or poten­tial error, fol­lowed by a more or less power­ful block­ing of intu­it­ive responses.

Cog­nit­ive psy­cho­logy high­lights a subtle trans­ition between the two major sys­tems of thought, a shift based on a fun­da­ment­al mech­an­ism, often at work in the shad­ows of our con­scious­ness, which we will call front­al inhib­i­tion. As we will fur­ther explore, this dir­ect eman­a­tion of pre­front­al cor­tex activ­ity plays a key role in sup­press­ing reflex­ive impulses and neut­ral­ising auto­mat­ic responses. It thus paves the way for the emer­gence of more thought­ful, delib­er­ate think­ing – the very think­ing we asso­ci­ate with reason.

To put it more subtly, intel­li­gence can­not be reduced to the brain’s abil­ity to ana­lyse and pro­cess data ¹; it lies much deep­er, in the subtle alchemy through which the front­al lobes – and espe­cially the pre­front­al cor­tex – exer­cise their role as guard­i­ans of dis­cern­ment, fil­ter­ing the influx of inform­a­tion through the salut­ary prism of doubt. Far from being a sign of weak­ness, this doubt becomes the emblem of cog­nit­ive eleg­ance: a serene vigil­ance, an intim­ate res­ist­ance to the decept­ive seduc­tions of evid­ence and com­mon sense. To evoke front­al inhib­i­tion is to name this decis­ive func­tion by which the mind sus­pends auto­mat­ism, restrains the momentum of first impres­sions, and rejects hasty responses or inap­pro­pri­ate beha­viour when cir­cum­stances require it. In short, front­al inhib­i­tion is, in the silence of men­tal func­tion­ing, the dis­creet focus of our lucidity.

Olivi­er Houdé’s research² has shed new light on the pro­gress­ive devel­op­ment of cog­nit­ive inhib­i­tion in chil­dren, based in par­tic­u­lar on clas­sic tests designed to assess the concept of con­ser­va­tion – wheth­er in terms of quant­ity, length or weight. Take, for example, the weight con­ser­va­tion test, in which a child is presen­ted with two identic­al balls of mod­el­ling clay. Then, in front of the child, one is flattened into a thin pan­cake while the oth­er retains its com­pact shape. When asked, “Do they still weigh the same?”, chil­dren who have not yet acquired the concept of con­ser­va­tion will often answer that the pan­cake weighs less, misled by the flat, thin appear­ance of the dough. Con­versely, chil­dren who have developed this abil­ity will under­stand that the mass remains unchanged, des­pite the change in shape. Build­ing on Jean Piaget’s work, Olivi­er Houdé shows how chil­dren gradu­ally learn that appear­ances can some­times be deceiv­ing and that cer­tain fun­da­ment­al prop­er­ties remain stable des­pite chan­ging forms. Impli­citly, this evol­u­tion in think­ing over time power­fully illus­trates the essen­tial role of front­al inhibition—the abil­ity to sus­pend overly hasty intuition—which, in our world sat­ur­ated with images and quick judge­ments, proves to be one of the most reli­able defences against misinformation.

This evol­u­tion in think­ing over time power­fully illus­trates the essen­tial role of front­al inhib­i­tion which proves to be one of the most reli­able defences against misinformation.

As such, one of the major – if not the most press­ing – goals of edu­ca­tion should be to nur­ture, refine and elev­ate this uniquely human fac­ulty of cog­nit­ive inhib­i­tion: the silent power to sus­pend our ini­tial impulse, to inter­rupt the imme­di­ate flow of auto­mat­ic responses and make way for delib­er­a­tion and self-con­trol. Long neg­lected in favour of more spec­tac­u­lar skills, this inner dis­pos­i­tion is nev­er­the­less the found­a­tion of inner free­dom, which allows the mind to break free from the chains of impuls­iv­ity. Recent advances in brain ima­ging have iden­ti­fied its loc­a­tion in the lim­in­al area of the pre­front­al cor­tex – the part of the brain that devel­ops par­tic­u­larly late, well after the mat­ur­a­tion of the more prim­it­ive struc­tures that orches­trate the rap­id, intu­it­ive and emo­tion­al activ­ity of Sys­tem 1. While the brain as a whole devel­ops gradu­ally dur­ing child­hood and adoles­cence, the front­al lobes pro­gress slowly, slowly shap­ing our abil­ity to delay action, weigh con­sequences and con­trol our passions.

The more gradu­al devel­op­ment of the front­al lobe brain largely explains the beha­vi­our­al char­ac­ter­ist­ics of adoles­cence: impuls­ive­ness, instabil­ity and aver­sion to delib­er­a­tion. Although the brain appears to have reached its archi­tec­tur­al form by the age of 18 to 21, the pre­front­al cor­tex con­tin­ues to refine its net­works for anoth­er ten years or so through the myelin­a­tion of nerve fibres, syn­aptic prun­ing and the gradu­al dens­i­fic­a­tion of neur­al con­nectiv­ity. It is there­fore only around the age of 25, some­times 30, that the front­al lobes reach true matur­ity, giv­ing the indi­vidu­al full capa­city for reg­u­la­tion, foresight and mor­al clar­ity. It is at this moment, often dis­creet and unnoticed, that human thought becomes truly for­ward-look­ing, and that self-aware­ness, freed from the tur­moil of the imme­di­ate present, can aspire to the enlightened exer­cise of freedom.

This new know­ledge sheds decis­ive light on the cent­ral role of this fac­ulty, not only when it comes to aca­dem­ic suc­cess, but also in reg­u­lat­ing emo­tions and, more broadly, in ensur­ing a har­mo­ni­ous social life. In the wake of Olivi­er Houdé’s work, we can there­fore argue for a genu­ine “pre­front­al cor­tex edu­ca­tion”: early train­ing, from the age of three or four, of this exec­ut­ive func­tion, which is the corner­stone of reflect­ive think­ing. For in a world sat­ur­ated with digit­al stim­uli and press­ing auto­mat­isms, stim­u­lat­ing the devel­op­ment of cog­nit­ive inhib­i­tion is no longer a simple edu­ca­tion­al choice – it is an urgent neces­sity, the pre­requis­ite for the enlightened exer­cise of free will.

In the con­text of philo­soph­ic­al scep­ti­cism, par­tic­u­larly among ancient scep­tics such as Pyrrho and Sex­tus Empiri­cus, men­tal inhib­i­tion plays a cent­ral role in decision-mak­ing, man­aging our atten­tion span and con­trolling our auto­mat­ic responses. For these pion­eers of front­al lobe strength­en­ing, cog­nit­ive inhib­i­tion allows for the vol­un­tary sus­pen­sion of judge­ment (epoché), caused by an inhib­i­tion of men­tal assent in the face of uncer­tain pro­pos­i­tions. In oth­er words, scep­tics choose not to decide between con­tra­dict­ory theses by men­tally inhib­it­ing their nat­ur­al inclin­a­tion to believe or judge.

This inhib­i­tion is act­ive; it is not the res­ult of an inab­il­ity to judge, but rather a choice, a con­scious decision not to do so. For this reas­on, it requires the involve­ment of the front­al lobes. By free­ing itself from dog­mat­ism and the dis­turb­ances caused by unfoun­ded opin­ions, front­al inhib­i­tion thus allows us to achieve atar­ax­ia (peace of mind res­ult­ing from the absence of belief).

This philo­sophy of quiet doubt dif­fers from mod­ern scep­ti­cism (such as Mon­taigne³ or Descartes and his fam­ous “meth­od­ic­al doubt”), which doubts not in order to sus­pend judge­ment, but rather to access the truth. Con­versely, Pyrrhon­ism doubts in order to free itself from the need for truth. Through this debate on the role of scep­ti­cism, two major func­tions of the front­al lobes emerge: on the one hand, the abil­ity to inhib­it the mind’s overly hasty flashes of insight, and on the oth­er, the abil­ity to orches­trate our thoughts meth­od­ic­ally in order to bring us as close as pos­sible to the truth. By com­par­ing Pyrrhoni­an scep­ti­cism with cer­tain mod­ern fig­ures, or even with related tra­di­tions such as empir­i­cism, phe­nomen­o­logy, exist­en­tial­ism and Buddhism⁴, a secret thread emerges, an under­ly­ing pat­tern that con­nects them all: the recog­ni­tion of uncer­tainty not as a weak­ness, but rather as a path to inner free­dom and access to serenity.

In short, front­al inhib­i­tion is at the heart of exec­ut­ive con­trol in human beings, nur­tur­ing essen­tial cog­nit­ive flex­ib­il­ity, sup­port­ing work­ing memory and facil­it­at­ing the thought­ful plan­ning of our actions. Without this capa­city for inhib­i­tion, Sys­tem 2 would be con­tinu­ally over­whelmed, short-cir­cuited by the imme­di­ate and auto­mat­ic responses of Sys­tem 1. Thus, we can say that the exist­ence of front­al inhib­i­tion con­fers at least three car­din­al vir­tues, which are the true pil­lars of crit­ic­al thinking:

• Intel­lec­tu­al humil­ity: know­ing the lim­its of one’s know­ledge – a form of dis­creet wis­dom that allows us to say, “I know what I know and what I don’t know.” 
• Restraint in judge­ment: the art of know­ing how to sus­pend con­clu­sions and not give in to the tempta­tion to jump to conclusions;
• Revi­sion of beliefs: the abil­ity to ques­tion, sus­pend or even read­just what we believe to be cer­tain­ties in the face of new information.

Ulti­mately, front­al inhib­i­tion is now emer­ging as an essen­tial cog­nit­ive tool: it is both a weapon against judge­ment bias and a meth­od of res­ist­ing the allure of illu­sion and false­hood, as well as an exist­en­tial stance, at the cross­roads of philo­sophy and spir­itu­al­ity, allow­ing us to move for­ward without being shackled by dogma. It remains, as Pyrrho already sensed, a path to lucid­ity – and, some­times, to that inner peace that only the sus­pen­sion of judge­ment can bring.

Exper­i­ments in cog­nit­ive psy­cho­logy elo­quently illus­trate the cru­cial role of cog­nit­ive inhib­i­tion. One of the most fam­ous paradigms in this field is the Stroop test. In this test, the sub­ject is presen­ted with words denot­ing col­ours, such as “red” or “green”, but prin­ted in a dif­fer­ent ink, for example, the word “red” writ­ten in blue. The chal­lenge is to name the col­our of the ink rather than read the word, a task that cre­ates a dir­ect con­front­a­tion between auto­mat­ic read­ing, gov­erned by Sys­tem 1, and vol­un­tary nam­ing, orches­trated by Sys­tem 2. Suc­cess­fully com­plet­ing this task requires acute inhib­it­ory capa­city, enabling the sub­ject to res­ist the instinct­ive urge to read the let­ters rather than the colour.

Anoth­er illu­min­at­ing example can be found in the field of cog­nit­ive biases, such as con­firm­a­tion bias. Nat­ur­ally, our Sys­tem 1 tends to seek evid­ence that cor­rob­or­ates our pre-estab­lished beliefs. We must there­fore devel­op con­stant vigil­ance and a strong inhib­it­ory effort to think against ourselves, to chal­lenge our ini­tial intu­itions and embrace a more thought­ful and slower crit­ic­al approach, guided by Sys­tem 2. In chil­dren, whose exec­ut­ive func­tions are still devel­op­ing, or in older people, where front­al inhib­i­tion tends to weak­en, the dif­fi­culty in inhib­it­ing auto­mat­ic responses is often more pro­nounced. This illus­trates, incid­ent­ally, that front­al inhib­i­tion is not an innate skill but a cog­nit­ive fac­ulty that is acquired over time but can also decline with age.

How­ever, the role of front­al inhib­i­tion goes far bey­ond simply cor­rect­ing errors. It is cent­ral to ration­al decision-mak­ing. The abil­ity to sus­pend hasty judge­ments, ques­tion one’s cer­tain­ties and ana­lyse a situ­ation from vari­ous angles relies on the inten­tion­al with­draw­al of Sys­tem 1 through inhib­it­ory action. Recent stud­ies have shown that indi­vidu­als who excel in logic­al reas­on­ing or cog­nit­ive reflec­tion tests do not neces­sar­ily have above-aver­age IQs, but are rather adept at con­tain­ing their erro­neous intu­itions. Ration­al­ity there­fore does not stem solely from raw intel­li­gence, but from a refined mas­tery of the activ­ity of the front­al lobes.

Finally, prac­tices such as crit­ic­al think­ing and mind­ful­ness can strengthen this inhib­it­ory capa­city by teach­ing us to observe our thoughts without imme­di­ately suc­cumb­ing to them. These approaches show that inhib­i­tion is not just an innate qual­ity, but a skill that can be cul­tiv­ated and refined through exper­i­ence and train­ing to dis­tance ourselves from our own rap­id thoughts.

The subtle mech­an­ism of front­al inhib­i­tion is not immune to vul­ner­ab­il­ity. Activ­at­ing it requires effort, because call­ing on Sys­tem 2is like climb­ing the steep slopes of slow think­ing – a demand­ing, energy-intens­ive endeav­our that mobil­ises our most pre­cious resources: sus­tained atten­tion, work­ing memory and inner vigil­ance. But let a breath of fatigue cloud men­tal clar­ity, let stress creep in, or let the tumult of thoughts over­flow the dykes of our con­cen­tra­tion, and this fac­ulty is shaken. Inhib­i­tion fal­ters, loses ground, and into this breach rushes Sys­tem 1 once again, with its mis­lead­ing short­cuts and sweet-talk­ing auto­mat­isms, ready to take back con­trol of our thoughts.

Cer­tain con­di­tions, such as atten­tion defi­cit hyper­activ­ity dis­order (ADHD), schizo­phrenia, or cer­tain front­al lobe syn­dromes, can drastic­ally com­prom­ise this abil­ity to inhib­it. The res­ult is increased impuls­iv­ity, marked dif­fi­culties in con­cen­trat­ing, and a propensity to give in to auto­mat­ic responses. In addi­tion, life­style factors such as alco­hol, lack of sleep, and the use of cer­tain drugs or med­ic­a­tions also under­mine this inhib­it­ory process.

In the most dra­mat­ic cases, where the front­al lobes are des­troyed, the con­sequences for beha­viour, cog­ni­tion and per­son­al­ity can be pro­found and some­times dis­astrous. We are reminded of this inev­it­able fate by the tra­gic story of Phineas Gage, a rail­way fore­man in the United States. In 1848, dur­ing a routine blast­ing oper­a­tion, a fate­ful spark triggered an explo­sion, pro­pelling a piece of iron – one metre long, three cen­ti­metres wide and weigh­ing six kilo­grams – through his skull. The object pierced his left cheek and passed through the base of his skull, tear­ing away his left front­al lobe. Incred­ibly, Gage sur­vived the cata­clysm, even remain­ing con­scious for sev­er­al minutes after the acci­dent. Although he recovered phys­ic­ally a few months after the acci­dent, those around him noticed pro­found and irre­vers­ible changes in his per­son­al­ity. The man who had once been a mod­el of respons­ib­il­ity, reli­ab­il­ity and soci­ab­il­ity had giv­en way to an impuls­ive, angry indi­vidu­al with no restraint or man­ners, unable to hold down a steady job or even main­tain a romantic rela­tion­ship. Phineas Gage ended up trav­el­ling across the United States as a macabre curi­os­ity, dis­play­ing his injur­ies and exhib­it­ing, as part of the Barnum cir­cus, the fam­ous crow­bar that had so bru­tally redefined his exist­ence. This poignant story res­on­ates through the ages, remind­ing us of the com­plex­ity and fra­gil­ity inher­ent in the nature of Homo sapi­ens.

The mere exist­ence of an inhib­it­ory mech­an­ism at the heart of the men­tal struc­ture is one of the most subtle gems of our cog­nit­ive archi­tec­ture – a silent but essen­tial pivot on which the fra­gile bal­ance of our think­ing human­ity rests. Like an intern­al con­duct­or, this inhib­it­ory sys­tem mod­u­lates the dia­logue between Sys­tems 1 and 2, tem­per­ing impuls­ive urges to give delib­er­ate thought the space it needs to flour­ish. Far from being a simple brake, inhib­i­tion reveals itself as the subtle lever that lifts the mind to the heights of crit­ic­al con­scious­ness, lucid­ity, and enlightened reas­on. This fac­ulty is the source of the mor­al respons­ib­il­ity of free human beings. As Albert Camus said, “A man is what he pre­vents him­self from becom­ing,” remind­ing us that human dig­nity lies in the abil­ity to restrain one­self, to not give in to one’s instincts or impulses, even when one has the power to do so!