El sesgo inconsciente puede cambiar la preselección.

Here el means the.

So El sesgo inconsciente is literally the unconscious bias.

In Spanish, it is very common to use the definite article with general concepts or abstract ideas, where English might also say unconscious bias without sounding as definite. So this sentence can still talk about the idea of unconscious bias in general, not necessarily one very specific bias already mentioned.

Sesgo means bias.

It is a masculine noun: el sesgo.

In this sentence, it refers to a tendency or distortion in judgment, not a physical tilt or slant. So in context, it means bias in decision-making, perception, or evaluation.

A related word you may also see is prejuicio, but that often means prejudice, which is not always exactly the same as bias.
So:

• sesgo = bias
• prejuicio = prejudice

In Spanish, adjectives usually come after the noun.

So:

• sesgo inconsciente = unconscious bias

This is the normal, expected order:

• noun: sesgo
• adjective: inconsciente

Putting the adjective before the noun is sometimes possible in Spanish, but it often changes the tone or emphasis. In a neutral statement like this, sesgo inconsciente is the standard order.

It does agree with the noun, but inconsciente is one of those adjectives that has the same form for masculine and feminine singular.

So you get:

• el sesgo inconsciente
• la decisión inconsciente

The article changes (el / la), but inconsciente stays the same in the singular.

In the plural, it changes normally:

• los sesgos inconscientes
• las decisiones inconscientes

Puede is the 3rd person singular present indicative of poder.

So:

• puedo = I can / I am able to
• puedes = you can
• puede = he/she/it can, or you can (formal usted)

In this sentence, puede cambiar means can change or is able to change.

After poder, Spanish uses an infinitive.

So:

• puede cambiar = can change

That is exactly like English can change.

You cannot say puede cambia because cambia is a conjugated form, and after puede you need the infinitive cambiar.

As for cambiarla: that would mean change it, with la replacing la preselección. It is possible, but the original sentence keeps the full noun phrase:

• puede cambiar la preselección = can change the preselection
• puede cambiarla = can change it

Preselección means preselection, shortlisting, or initial screening/selection, depending on context.

It comes from:

• pre- = pre-
• selección = selection

So it refers to an earlier stage before the final choice is made.

In hiring, for example, la preselección could mean the stage where candidates are shortlisted before interviews or final decisions.

Preselección is a noun, so it normally takes an article when you are talking about a particular process or stage:

• la preselección = the preselection / the shortlisting stage

Spanish often uses articles more regularly than English does. In English, you might sometimes say simply preselection, but in Spanish la preselección sounds natural and complete.

The written accent in preselección shows where the stress goes:

• pre-se-lec-ción

Without getting too technical, words ending in -n are normally stressed on the second-to-last syllable, but selección / preselección are stressed on the last syllable, so they need a written accent.

That accent also helps you recognise the very common ending -ción, which often corresponds to English -tion:

• nación = nation
• información = information
• selección = selection
• preselección = preselection

In standard Peninsular Spanish, preselección is pronounced roughly like:

preh-seh-lek-THYON

A few helpful points:

• pre- as in preh
• se- as in seh
• lec ends with a k sound
• -ción in Spain has a th sound because c before i is often pronounced /θ/ in most of Spain

So in much of Spain:

• selección sounds roughly like seh-lek-THYON

If you hear Latin American Spanish, that th sound is usually an s sound instead.

You might hear subconsciente, but sesgo inconsciente is the much more standard and idiomatic way to say unconscious bias.

So for this concept, inconsciente is the safer and more natural choice.

In other words:

• sesgo inconsciente = the usual expression
• sesgo subconsciente = understandable, but less standard for this idea

Yes, it is a very common and natural translation.

You may also sometimes see:

• sesgo implícito = implicit bias

These are related, and in some contexts they may overlap, but they are not always exact synonyms in every academic or professional setting.

Still, for everyday use, sesgo inconsciente is a very good and standard way to say unconscious bias.

Yes, puede cambiar can sometimes cover both ideas depending on context.

It can mean:

• can change = has the ability to change
• may change = it is possible that it changes

In this sentence, the most natural reading is usually can change or may affect/change the preselection process.

Spanish often leaves that slight ambiguity to context.

Yes, it is grammatically correct and understandable.

That said, depending on context, native speakers might sometimes choose a slightly more specific verb such as:

• afectar = affect
• influir en = influence
• alterar = alter

For example:

• El sesgo inconsciente puede afectar la preselección.
• El sesgo inconsciente puede influir en la preselección.

But puede cambiar la preselección is still perfectly valid if the intended meaning is that unconscious bias can change or modify the outcome or process of preselection.