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Lecture

NROC34 - Lec 7 - Bees and Locusts.doc

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Department
Neuroscience
Course Code
NROC34H3
Professor
Andrew Mason

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Description
C34 : Lec 7 Bees and Locusts Waggle dance: o Upon returning to the hive after discovering food source = bee repeatedly performs series of behaviors that communicates to other bees the location of food source o Fig 8 o Other bees follow this beh and obtain info o Quanitative variation = angle of waggle run + duration of waggle run varies w/ food location o Angle of waggle run relative to vertical represents direction to food source relative to the direction of sun viewed from hive o Duration of waggle run always indictates distance but the SCALING of the run (# of waggles/meter of real distance) varies among diff bee species Round dance: o Collapsed dance = single circle = not fig 8 o If food souce is less than 100m away, the dance is too short to provide precise distance info o Qualitative difference = can say that food source is nearby Measuring distance: o Recent evidence shows that bees measure distance by integration of visual motion = measure how much of the visual world/landscape has gone by STUDIES: 1) Vertically striped tunnel w/ food in the middle; bees were trained to find food in the middle The foragers give info to new recruits who search back and forth for the food around the centre Bees accurately locate the feeder position in the presence of any pattern that generates visual motion = vertical stripes OR random texture When the pattern was replaced w/ one that is CONSTANT during forward motion (= horizontal stripes), they can no longer locate the feeder position; do poorly b/c pattern doesnt change as the bees fly through the tunnel = bee flies from one end of the tunnel to the other no longer have any perception of how far they went down the tunnel Degree of visual motion that is perceived is dependent on the difference of distance btn eyes and walls If something close by, you perceive it as moving more quickly than when its further away Distance is under-estimated in a tunnel narrower than during training (because when something is close by, you perceive it as moving quickly than when it is further away) and over-estimated in a wider tunnel 2) Tunnel 1: 35 m away (=short distance for bees) and no time w/in the tunnel -round dance because bee did not travel through the tunnel (and therefore no pattern motion) and it only flew 35 m in real world (which is short distance) Tunnel 2: 35 m away (=short distance for bees) and random texture w/in tunnel and food at far end (6m) -waggle dance b/c flew 6 m through random texture tunnel which generated more pattern motion; it doesnt matter that the absolute distance is so short, it still has more pattern motion which signals long distance Tunnel 3: 35 m away (=short distance for bees) and horizontal stripes w/in tunnel and food at far end (6m) -the horizontal stripes arent motion generating pattern -since no motion detected, bees search entire tunnel -round dance even though relatively further b/c travelling through horizontally striped tunnel which doesnt generate any pattern motion Tunnel 4: 6 m away (=very short distance for bees) and random texture w/in tunnel and food at far end (6m) -waggle dance even though this is the shortest world distance; travelled 6m w/in random texture tunnel = generates significant pattern motion signalling long distance Calibrate the dance for normal flight: -6m real world + 6m tunnel did waggle run that corresponds w/ absolute distance of 184m -35m real world + 6m tunnel did waggle run that corresponds w/ absolute distanceof 230m -bees do 1.88ms of waggling per meter of distance travelled; flying in a patterned tunnel magnifies the perceived distance by 31X -units of visual motion when bee in middle of tunnel = 1ms of waggle represents 17.7 degrees of image motion Therefore, bees measure distance in degrees of image displacement 3) Bees stay in the middle if the walls dont move even if the 2 walls have patterns of diff spatial freq If one of the walls is moved while they fly by, they shift towards one side or the other depending on direction of wall mvt therefore, theyre sensitive to angular velocity and not temporal freq (as in optomotor responses) suggests the existence of other motion-sensitive pathways in the visual sys If you move wall in the same direction bee travels = bee will move closer the wall thats travelling w/ it to balance out perceived motion of
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