Telescoping Effect

Also known as: Time compression, Temporal displacement

The telescoping effect is a memory bias where people misjudge the timing of past events. Recent events seem further back in time (backward telescoping), while distant events seem more recent (forward telescoping).

Memory Biases

2 min read

experimental Evidence


Telescoping Effect

The Psychology Behind It

Time is subjective. Our brains do not have a built-in clock that timestamps memories with perfect accuracy. Instead, we reconstruct the timing of events based on their vividness, clarity, and the number of intervening events.

"Forward telescoping" is the most common form: old events feel like they happened yesterday. This is why people often say, "It feels like just last year that I graduated," when it was actually a decade ago. The memory is vivid, so it feels close.

"Backward telescoping" happens with very recent events, which can feel like they happened a long time ago, often because a lot has happened since then (high density of intervening events).

Real-World Examples

"The Good Old Days"

Older adults often perceive events from their youth (like the release of a classic movie or a historical event) as being much more recent than they are. "Wait, The Matrix came out how long ago?"

Crime Reporting

When asked how often they have been victimized by a crime, people often report crimes that happened 3 years ago as happening "in the last year" due to forward telescoping. This can inflate crime statistics in surveys.

Product Launches

Consumers might think a product has been on the market for a shorter time than it actually has, making it feel "new" for longer.

Consequences

The telescoping effect can lead to:

  • Inaccurate Reporting: Surveys and censuses that rely on memory (e.g., "How many times did you visit the doctor in the last year?") are often inaccurate.
  • Distorted History: We may misjudge the pace of historical change, thinking things are moving faster or slower than they are.
  • Poor Planning: We might underestimate how much time has passed since we last performed a maintenance task (e.g., changing the oil, visiting the dentist).

How to Mitigate It

To fix our internal clock, we need external references.

  1. Use Landmarks: Anchor events to known dates (e.g., "That happened the year Obama was elected" or "That was before I moved to this house").
  2. Keep Records: Don't rely on memory for recurring tasks. Use logs, calendars, and apps.
  3. Verify Dates: Before stating "That was just a few years ago," check the actual date. You will often be surprised.

Conclusion

The telescoping effect shows that our memory is a telescope, not a calendar. It compresses and stretches time, bringing the distant near and pushing the near away. By relying on external records, we can see time in its true proportions.

Mitigation Strategies

Bounded Recall: In surveys, ask 'Since January 1st of this year...' rather than 'In the last year' to provide a hard boundary.

Effectiveness: high

Difficulty: moderate

Documentation: Write down the date of significant events immediately. Trust the paper, not the feeling.

Effectiveness: high

Difficulty: moderate

Potential Decision Harms

Policymakers may react to a 'crime wave' that is actually just a result of telescoping in victimization surveys.

major Severity

Investors may misjudge the frequency of market crashes, thinking they happen more often than they do because the memories are vivid.

moderate Severity

Key Research Studies

A study of response errors in expenditures data from household interviews

Neter, J., & Waksberg, J. (1964) Journal of the American Statistical Association

Identified the telescoping effect in household surveys, where respondents displaced expenditures in time.

Read Study →


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