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Related Concept Videos

Perception01:28

Perception

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Perception is a fundamental psychological process that enables individuals to organize, interpret, and consciously experience sensory information. This process is crucial for understanding and interacting with the world around us. It includes both bottom-up and top-down processing, each playing a distinct role in how we perceive our environment.
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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Sensory Perception: Organization of the Somatosensory System01:11

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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Factors Affecting Perception01:25

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Perception is influenced by perceptual set, context, motivation, and emotion. Perceptual set, or perceptual expectancy, refers to the tendency to perceive things in a particular way, influenced by previous experiences and expectations. This phenomenon affects the interpretation of stimuli, creating a set of mental tendencies and assumptions that impact sensory perceptions of sound, taste, touch, and sight.
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Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Methods to Explore the Influence of Top-down Visual Processes on Motor Behavior
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Top-down influence on bottom-up process: the familiarity effect modulates texture segmentation.

Cristina Meinecke1, Christine Meisel1

  • 1University Erlangen-Nürnberg, Erlangen, Germany.

Vision Research
|December 31, 2013
PubMed
Summary
This summary is machine-generated.

The familiarity effect (FE) improves search performance for unfamiliar targets in familiar settings. This robust effect is only diminished by high visual density or very short target presentation times.

Keywords:
Central performance drop CPDRetinal eccentricityReversed letter effectSearch asymmetry

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Area of Science:

  • Cognitive psychology
  • Visual perception
  • Human-computer interaction

Background:

  • The familiarity effect (FE) describes enhanced search performance when an unfamiliar target is detected within a familiar context.
  • This contrasts with the reduced performance observed when a familiar target appears in an unfamiliar context.

Purpose of the Study:

  • To systematically investigate the spatial and temporal conditions influencing the familiarity effect (FE).
  • To determine the factors that enable or eliminate the appearance of the FE.
  • To explore the underlying cognitive processes, including bottom-up and top-down processing, involved in the FE's search asymmetry.

Main Methods:

  • Experiments systematically varied spatial and temporal conditions.
  • Data collection was performed as a function of target eccentricity.
  • The study analyzed search performance under different contextual familiarities and target characteristics.

Main Results:

  • The familiarity effect (FE) demonstrated robustness across various conditions.
  • The FE was nearly eliminated only under conditions of high texture element density and extremely short presentation times (43 ms).
  • Evidence suggests the involvement of both bottom-up and top-down processes in the FE's search asymmetry.

Conclusions:

  • The FE's asymmetry may stem from reduced bottom-up processing resources at peripheral target locations.
  • This resource reduction is potentially caused by increased top-down processing demands when encountering unfamiliar contextual elements in foveal vision.
  • The findings highlight the interplay between contextual familiarity, attentional processes, and visual search efficiency.