Touching the phantom limb

Article Abstract:

A study on perceived sensation in phantom limbs shows that when the phantom limb is visualized as moving in a mirror due to movement of the normal hand, the individual feels the movement. This feeling of movement is observed only when the eyes are open. However, the individuals cannot feel pain or temperature in their phantom limbs. This is probably due to the passage of the sensory perception from one hand through commissural pathways to the other hand. This sensory stimulus is weak when both the hands are present but is strong when there is only one hand.

Senses and sensation, Senses, Phantom limb

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Object recognition can drive motion perception

Article Abstract:

Apparent motion is observed when two spots of light flash in succession. The rotation of an image of a face can be perceived once an image has been recognised as a face. Prior to this recognition, the component parts of the face seem to move in a random and two-dimensional way. High-level object representation appears to influence perception of motion. A temporary object which has arisen through perceptual learning is enough of an input for motion to be perceived. Different puzzle pictures can give rise to similar effects.

Analysis, Psychological research

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Rapid adaptive camouflage in tropical flounders

Article Abstract:

A study was conducted on the pattern-matching ability of the tropical flatfish Bothus ocellatus. The fish was found to be capable of changing the contrast of sets of splotches of various grain size on the skin, allowing it to blend into background textures in a span of 2-8 seconds. Squids are also capable of such rapid camouflage in the same manner as the Bothus ocellatus, making for a good example of convergent evolution.

Flatfishes, Camouflage (Biology)

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