Are men better nor wimmen at heid-turnin?

Voyer and colleagues’ synthesis splits findings by the particular test and the way it wis carried oot. Linn and Petersen’s earlier synthesis likewise tells apart heid-turnin, spatial perception and spatial visualization. Giein ae nummer as a sex difference in aa spatial ability loses that distinction. Voyer et al., 1995 Linn et al., 1985

Whit does a heid-turnin task ask ye tae dae?

The classic experiments by Shepard and Metzler leukit at decisions aboot turnit three-dimensional objects. Vandenberg and Kuse made a group paper test wi its ain questions and scoring method. A browser task wi different figures, time limits or response rules disnae automatically get the norms o either test. Shepard et al., 1971 Vandenberg et al., 1978

This means an accuracy difference, a difference in time tae finish, and a difference in the number o questions reached afore time’s up are different results. The test’s method is pairt o the finding, no a wee detail tae be ignored. Voyer et al., 1995 Linn et al., 1985

Whit does an average difference say aboot how much scores overlap?

It disnae mean that aa men dae better nor aa wimmen, or that ye can predict ae person’s score frae their sex. Hyde’s review sets sex differences in cognition in the wider context o mony similarities and differences that depend on the task. Group summaries are nae personal verdicts. Hyde, 2005

Dae the studies prove whit causes the difference?

Seeing a difference disnae single oot biology, experience, strategies, test design or the wey they interact. The cited meta-analyses sum up results and factors that affect them; they dinnae justify a claim that ae cause explains an individual. Developmental patterns depend on the measure an aa, no on ae universal age whan ilka spatial difference appears. Voyer et al., 1995 Linn et al., 1985

Can practice change performance?

Uttal and colleagues’ meta-analysis o spatial training fund an average training effect o Hedges’ g = 0.47 efter outliers were left oot. The synthesis covers different kinds o spatial training, no juist heid-turnin and no the Helibrain gemme. It backs the idea that spatial performance can change, but disnae promise the same gains for aa or that a group difference will disappear completely. Uttal et al., 2013

Retest research finds gains on cognitive ability tasks an aa. Sa a better result the neist time needs tae be compared in a wey that taks account o practice and familiarity wi the task afore it can be linked tae a wider change in ability. Scharfen et al., 2018

Hou should ye mak sense o yer ain result?

Keep the figures, time limit and scoring the same, and leuk at speed alang wi accuracy. Reliability research warns that a task that works weel in an experiment disnae automatically gie a steady ranking o individuals. Ae short result is wee evidence for a fixed spatial trait in a person. Hedge et al., 2017

A useful wey tae read it is tae focus on the task: find oot whit turns or rules are hard, and check yer progress on similar new questions. The evidence backs learnin spatial skills, while the amount an individual improves is still uncertain. It disnae back a claim that ae sex cannae turn objects or that this gemme boosts general intelligence. Uttal et al., 2013 Hyde, 2005

The count o 286 effect sizes tells ye hou broad ae historical synthesis wis. Dinnae tak it for a modern representative norm sample or a nummer ye can uise tae calculate a browser percentile. Voyer et al., 1995