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Sensory Memory

Sensory Memory

Sensory memory stores information received through the senses for a very brief period (1–3 seconds). It is the first gateway of memory, and only information that receives attention passes on to the next stage.

Details

What Is Sensory Memory?

Sensory memory is a memory system that holds stimuli received through the sense organs (eyes, ears, skin, etc.) in their original form for a very short period of time. It is the first stage in the three-stage model of memory (Sensory Memory → Short-Term Memory → Long-Term Memory).

Types of Sensory Memory

Sensory memory is categorized by sensory modality.

  • Iconic Memory: Stores visual information for approximately 0.5–1 second. This was revealed through George Sperling's experiments.
  • Echoic Memory: Stores auditory information for approximately 2–4 seconds. This is why you can momentarily replay something someone just said.
  • Haptic Memory: Stores tactile information for a brief period of time.

    • Characteristics of Sensory Memory

  • High capacity, ultra short duration: It takes in an enormous amount of information, but retains it for only an extremely brief time
  • Unconscious: It mostly occurs without our awareness
  • Selective transfer: Only information that receives attention passes into short-term memory; the rest fades away

    • Everyday Experiences

    We experience sensory memory every moment. The brief afterimage of a lightning flash lingering before your eyes, or being able to replay what someone just said even after zoning out and asking 'What?' — these are all thanks to sensory memory.

    A Warm Note from Mindy

    Mindy says: 'Our minds take in an enormous amount of sensory information every single moment. But you don't need to remember everything — your mind naturally selects what matters. That said, when you consciously bring your attention to the present moment, you can experience life more richly and vividly.'

    Sensory Memory and Attention

    The key factor that determines which information moves from sensory memory into short-term memory is attention. By practicing mindfulness and strengthening your attentional focus, you can process sensory experiences more deeply.

    💡 Real-Life Example

    While listening to a friend talk, you briefly drift into your own thoughts — but before you even ask 'What did you say?', you realize the words are still lingering in your ears and you can recall what was said. This is echoic memory at work.

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    This content is for educational purposes and does not replace professional medical diagnosis.

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