Sensory memory
Sensory Memory - Sensory memory is affiliated with the
transduction of energy (change from one sort of energy to another). Sensory memory The
environment makes available a spread of sources of data (light, sound, smell,
heat, cold, etc.), but the brain only understands electrical stimulation. Sensory memory The
body has special sense organ cells that transduce this external energy to
something the brain can understand. within the process of transduction, a
memory is made . This memory is extremely short (less than 1/2 second for
vision; about 3 seconds for hearing).
The sensory memory retains a particular copy of what's seen
or heard (visual and auditory). it's absolutely critical that the learner
attend to the knowledge at this first stage so as to transfer it to subsequent
one. Sensory memory There are two major concepts for getting information into STM: first,
individuals are more likely to concentrate to a stimulus if it's a stimulating
feature. Second, individuals are more likely to concentrate if the stimulus
activates a known pattern.
Sensory memory is a brief storage of
information in humans wherein information is momentarily registered until it is
recognized, and perhaps transferred to short-term memory (Tripathy & Öǧmen,
2018). Sensory memory allows for the retention of sensory impressions following
the cessation of the original stimulus (Coltheart, 1980).
Types of Sensory Memory
Sensory memory can be divided into subsystems called the sensory
registers: such as iconic, echoic, haptic, olfactory, and gustatory.
Iconic Memory
Iconic
memory is the visual sensory memory register which stores visual images after
its stimulus has ceased (Pratte, 2018). While iconic memory contains a huge
capacity, it declines rapidly (Sperling, 1960). Information stored in iconic
memory generally disappears within half a second (depending on the brightness).
Activity
Close your eyes for
one minute, and hold your hand about 25cm from your face ad then open and close
your eyes. You should see an image of your hand that fades away in less than a
second (Ellis, 1987).
Examples of Iconic
Memory
- Seeing
an ant on the wall
- Seeing
an aircraft in the sky as you walk down the road
- Seeing
the change of traffic lights
A recent study sought to examine the hypothesis that iconic memory
comprises fine-grained and coarse-grained memory traces (Cappiello & Zhang,
2016). The study employed a mathematical model to quantify each trace. The
outcome suggested that the dual-trace iconic memory model might be superior to
the single-trace model.
Echoic Memory
Echoic
memory is the sensory memory for incoming auditory information (sounds). The
information which we hear enters our organism as sound waves. These are sensed
by the ears’ hair cells and processed afterwards in the temporal lobe. The
processing of echoic memories generally takes 2 to 3 seconds (Darwin, Turvey
& Crowder, 1972).
Activity
Clap your hands
together once and see how the sound remains for a brief time and then fades
away.
Examples of Echoic
Memory
- Hearing
the bark of a dog
- Hearing
the whistle of a police officer
- Hearing
the horn of a car
The
recent use of the Mismatch Negativity (MMN) paradigm which employs MEG and EEG
recordings, has unveiled many characteristics of echoic memory (Sabri, Kareken,
Dzemidzic, Lowe & Melara, 2003).
Consequently,
language acquisition and change detection have been identified as some crucial
functions of echoic memory. Additionally, a study on echoic sensory alterations
suggests that a presentation of a sound to a participant is sufficient to shape
a trace of echoic memory which can be compared with a different sound (Inui,
Urakawa, Yamashiro, Otsuru, Takeshima, Nishihara & Kakigi, 2010).
Moreover,
a study of language acquisition indicates that children who start speaking late
are likely to have an abridged echoic memory (Grossheinrich, Kademann, Bruder,
Bartling & Suchodoletz, 2010).
Furthermore,
lesions on or damage to the parietal lobe, the hippocampus or the frontal lobe
too, would likely shorten echoic memory or/and slow down its reaction time
(Alain, Woods & Knight, 1998).
Haptic Memory
Haptic
memory involves tactile sensory memories procured via the sense of touch
through the sensory receptors which can detect manifold sensations such as
pain, pressure, pleasure or itching (Dubrowski, 2009). These memories tend to
last for about two seconds.
It
enables us to combine a series of touch sensations and to play a role in
identifying objects we can’t see. E.g. Playing a song on guitar, sharp pencil
on the back of hand.
Examples of Haptic
Memory
- Feeling
a raindrop on your skin
- Feeling
a key while typing on the keyboard
- Feeling
a string as you play the guitar
The
information which enters through sensory receptors travel via the spinal cord’s
afferent neurons to
the parietal lobe’s postcentral gyrus through the somatosensory system (Shih,
Dubrowski & Carnahan, 2009) (D'Esposito, Ballard, Zarahn & Aguirre,
2002).
fMRI
studies suggest that certain neurons within the prefrontal cortex engage in
motor preparation and sensory memory. Motor preparation provides a significant
link to the haptic memory’s role in motor responses.
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