Last updated September 16, 2026
Short answer: "The Science of Memory Consolidation" is Passage 3 of ParrotTalk's free IELTS Academic Reading Test 2. It carries 14 questions (27 to 40): sentence completion and multiple choice. Allow about 20 minutes, as in the exam. The full text is below, the questions are in the test, and the answer key is at the end of this page. No sign-up.
This page gives the full text of the passage so that you can read it at your own pace, before the test or afterwards to see where each answer was. The questions are not reproduced here: they appear on the ParrotTalk Reading page once you start Reading Test 2, with the three passages on tabs and one 60-minute clock. The button above opens that page with Test 2 already selected.
Memory is one of the most fundamental cognitive capacities, enabling humans to learn from experience, plan for the future, and construct a sense of personal identity. Yet the processes by which memories are formed, stored, and retrieved remain the subject of intensive scientific investigation. The past three decades have produced remarkable insights into the neuroscience of memory, driven in large part by advances in brain imaging technologies and molecular biology.
Memory consolidation refers to the process by which newly acquired information is transformed from a fragile, temporary state into a stable, long-term memory. This process occurs in stages. During learning, electrical signals between neurons create temporary connections known as synaptic pathways. These pathways must then be stabilised through a molecular process involving the synthesis of new proteins within the neuron. Without this protein synthesis, memories remain vulnerable to disruption and are likely to be lost.
The hippocampus, a curved structure located in the medial temporal lobe of the brain, plays a central role in the initial formation of declarative memories, those involving facts and events. However, the hippocampus does not serve as the permanent storage site for long-term memories. Over time, memories are gradually transferred and distributed across the cortex through a process called systems consolidation, which is strongly facilitated by sleep.
Research has demonstrated that sleep serves a critical function in memory consolidation. During slow-wave sleep, the deepest stage of non-REM sleep, the hippocampus repeatedly reactivates recently formed memories and transfers information to the cortex for long-term storage. This reactivation process is thought to strengthen the neural connections associated with the memory and integrate new information with existing knowledge.
One well-established finding is that the interval between learning and sleep has a significant effect on memory retention. Studies have shown that learning shortly before sleeping produces markedly better long-term recall than learning followed by a waking period of equal duration. This effect, sometimes described as "sleep-dependent memory consolidation," has practical implications for educational strategies.
The phenomenon of reconsolidation, the discovery that memories become temporarily fragile each time they are retrieved, has transformed understanding of memory's dynamic nature. When a stored memory is recalled, it re-enters a labile state in which it can be modified, strengthened, or even destabilised by new information or emotional experience. This finding has significant implications for the treatment of conditions such as post-traumatic stress disorder (PTSD), where traumatic memories can potentially be weakened by intervening during the reconsolidation window.
hippocampus: a part of the brain involved in forming new memories
labile: likely to change or be altered easily
14 questions, numbered 27 to 40 in Reading Test 2, in 2 groups:
Every answer is in the text: for True/False/Not Given, "Not Given" means the passage neither confirms nor contradicts the statement, so do not answer from general knowledge; for completion questions, use words from the passage only, within the word limit given in the instructions.
Complete the sentences below. Use NO MORE THAN TWO WORDS from the passage for each answer.
Choose the correct letter A, B, C or D.
Yes. The full text of "The Science of Memory Consolidation" is on this page, and the 14 questions that go with it are in Reading Test 2 on ParrotTalk, which is free, with no sign-up, no email and no card, and scored automatically with an estimated band.
Academic. The passages are Academic Reading texts and the band uses the Academic conversion table; there is no General Training passage on ParrotTalk. The Reading page lets you tick General Training before you start, and then adds a note that on the real General Training scale the same raw score gives a band about one step lower. The General Training conversion table is on the band score calculator.
About 20 minutes. The IELTS Reading test gives 60 minutes for three passages and 40 questions, with no extra time to transfer answers, so 20 minutes per passage is the usual budget. In Reading Test 2 the three passages share one 60-minute clock, so you can spend a little longer on this one if the others go faster.
ParrotTalk is free, with no sign-up. Bands are estimates, not official IELTS results. ParrotTalk is independent and not affiliated with IELTS, the British Council, IDP, or Cambridge English. See the band score calculator for the raw score to band tables.