# Imprinting and Sensitive Periods

Psychology I · Ethology · https://tryals.app/learn/psychology-i/imprinting-and-sensitive-periods

## Learning on a Deadline

**Imprinting** is rapid, unreinforced learning that occurs during a narrow developmental window. Unlike standard learning, it needs no rewards or practice.

Konrad Lorenz showed this with greylag geese: hatchlings follow the first large moving object they see. A gosling will imprint on a bouncing ball purely from exposure.

| Type | What it shapes | Timing |
| --- | --- | --- |
| **Filial imprinting** | Proximity to parents | Hours after birth |
| **Sexual imprinting** | Adult mate preference | Early life, expressed later |

**Common pitfall:** assuming imprinting requires food or reinforcement to stick. It requires only exposure during the window.

## Two Types of Bonds

**Filial imprinting** ensures the young animal stays close to a parental figure for protection during its most vulnerable stage.

**Sexual imprinting** shapes later mate choices. If a zebra finch is raised by a foster species, it will often court that foster species as an adult instead of its own.

**Critical vs. Sensitive Periods:** A **critical period** has hard biological edges where imprinting cannot happen outside the window. A **sensitive period** is a softer window where learning is easiest, but not strictly impossible outside it.

## Practice questions

7 of this lesson's 12 practice questions, with answers. The full set is in the app.

### 1. Sort each example by whether it is filial imprinting or sexual imprinting.

**Answer:**

- Filial imprinting: A gosling follows the first large moving object it sees hours after hatching, A duckling stays close to a human it encountered right after hatching
- Sexual imprinting: A zebra finch raised by a foster species courts that species as an adult, A male bird raised by foster parents later prefers mates resembling them

**Why:** Filial imprinting forms an attachment to a parental figure, expressed within hours; sexual imprinting shapes adult mate preference, expressed only much later in adulthood. The tell is whether the effect is 'who to follow now' versus 'who to court as an adult'.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/sort-each-example-by-whether-it-is-filial-imprinting-or-sexual

### 2. Lorenz's goslings imprinted on him though he offered no food. Why does that make imprinting different from ordinary conditioning?

A. Because the goslings mistook him for a source of warmth instead
B. Because imprinting is faster than conditioning but works the same way
C. Because it needs no reinforcement, only exposure in the window
D. Because Lorenz did provide food, which the account omits

**Answer:** C. Because it needs no reinforcement, only exposure in the window

**Why:** Reinforcement is exactly what imprinting does without. A narrow window plus mere exposure produces a lasting attachment, which is why it is treated as its own category.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/lorenzs-goslings-imprinted-on-him-though-he-offered-no-food-why

### 3. A gosling will imprint on and follow a bouncing ball it encounters during the sensitive period, even though the ball never provides food.

**Answer:** True

**Why:** True. Imprinting requires no reinforcement - exposure to a moving object during the window is enough, so a gosling will follow a food-less bouncing ball. This is exactly what distinguishes imprinting from reward-based learning.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/a-gosling-will-imprint-on-and-follow-a-bouncing-ball-it-encounters

### 4. Order the steps of filial imprinting in a newly hatched gosling.

**Answer:**

1. The gosling hatches and its sensitive window opens.
2. It encounters the first large moving object nearby.
3. It imprints on that object with no reward involved.
4. It follows the object closely, gaining protection.
5. The bond shapes its later social and mate behavior.

**Why:** Hatching opens the window, the first moving object is encountered and imprinted on without reward, following behavior secures protection, and the bond then shapes later behavior. The reward-free, exposure-driven formation is the key feature.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/order-the-steps-of-filial-imprinting-in-a-newly-hatched-gosling

### 5. Lorenz's goslings followed **him**. If imprinting is an adaptation for recognising your mother, why is the mechanism loose enough to accept an Austrian zoologist?

A. Because goslings cannot perceive shape, only movement
B. Because Lorenz deliberately resembled a goose to the birds' visual system
C. Because imprinting is not adaptive but a developmental accident
D. Because for a gosling that cheap rule was almost always right

**Answer:** D. Because for a gosling that cheap rule was almost always right

**Why:** Evolution buys rules that are just good enough. 'Follow the first large moving thing' was free and effectively never wrong in a nest, so no finer discrimination was worth paying for. Lorenz did not defeat the mechanism, he stepped into a gap the world had never previously opened.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/lorenzs-goslings-followed-him-if-imprinting-is-an-adaptation-for

### 6. Select every statement that is TRUE about imprinting and its timing.

A. Imprinting requires no reinforcement to become established.
B. Imprinting can only occur once a food reward is present.
C. A sensitive period has softer edges than a strict critical period.
D. Sexual imprinting can misdirect mate choice onto a foster species.
E. Imprinting is easily reversed later, like ordinary learning.

**Answer:** A. Imprinting requires no reinforcement to become established.; C. A sensitive period has softer edges than a strict critical period.; D. Sexual imprinting can misdirect mate choice onto a foster species.

**Why:** No reinforcement needed, sensitive periods being softer than critical ones, and foster-species mate misdirection are all true. Imprinting is durable (not easily reversed) and needs no food reward - so those two are false.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/select-every-statement-that-is-true-about-imprinting-and-its-timing

### 7. A zebra finch raised by foster parents of another species courts that species when adult, even after years living among its own kind. Why is a preference formed in a few early weeks so resistant to a lifetime of contrary experience?

A. Because birds are incapable of learning anything at all once they reach sexual maturity.
B. Because the foster parents' appearance was simply seen more often in total than any other, so it remains the strongest association.
C. Because the finch has no way of telling its own species from the foster species, so any preference would be arbitrary.
D. Because sexual imprinting sets a template during a limited window.

**Answer:** D. Because sexual imprinting sets a template during a limited window.

**Why:** Ordinary learning predicts the opposite: years among conspecifics should swamp a few foster weeks, and it does not. Later input is not outvoted, it is not consulted. The design fits a fact that does not change and whose best evidence, who feeds you in the nest, is available early, and the cost is that early errors are permanent.

Page: https://tryals.app/practice/psychology-i/imprinting-and-sensitive-periods/a-zebra-finch-raised-by-foster-parents-of-another-species-courts-that